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Re: [PATCH v11 2/9] dma-buf: dma-heap: export declared functions

by T.J. Mercier

On Wed, Aug 13, 2025 at 11:13 PM Sumit Garg <sumit.garg(a)kernel.org> wrote: > > On Wed, Aug 13, 2025 at 08:02:51AM +0200, Jens Wiklander wrote: > > Export the dma-buf heap functions to allow them to be used by the OP-TEE > > driver. The OP-TEE driver wants to register and manage specific secure > > DMA heaps with it. > > > > Signed-off-by: Jens Wiklander <jens.wiklander(a)linaro.org> > > Reviewed-by: Sumit Garg <sumit.garg(a)oss.qualcomm.com> > > --- > > drivers/dma-buf/dma-heap.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > Can we get an ack from DMAbuf maintainers here? With that we should be > able to queue this patch-set for linux-next targetting the 6.18 merge > window. > > -Sumit Reviewed-by: T.J. Mercier <tjmercier(a)google.com> Sorry I haven't been able to participate much upstream lately. > > > diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c > > index 3cbe87d4a464..cdddf0e24dce 100644 > > --- a/drivers/dma-buf/dma-heap.c > > +++ b/drivers/dma-buf/dma-heap.c > > @@ -202,6 +202,7 @@ void *dma_heap_get_drvdata(struct dma_heap *heap) > > { > > return heap->priv; > > } > > +EXPORT_SYMBOL(dma_heap_get_drvdata); > > > > /** > > * dma_heap_get_name - get heap name > > @@ -214,6 +215,7 @@ const char *dma_heap_get_name(struct dma_heap *heap) > > { > > return heap->name; > > } > > +EXPORT_SYMBOL(dma_heap_get_name); > > > > /** > > * dma_heap_add - adds a heap to dmabuf heaps > > @@ -303,6 +305,7 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info) > > kfree(heap); > > return err_ret; > > } > > +EXPORT_SYMBOL(dma_heap_add); > > > > static char *dma_heap_devnode(const struct device *dev, umode_t *mode) > > { > > -- > > 2.43.0 > >

1 month

Re: [PATCH v11 05/11] tee: add TEE_IOCTL_PARAM_ATTR_TYPE_UBUF

by Jens Wiklander

Hi Amir, On Thu, Sep 11, 2025 at 5:41 AM Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> wrote: > > For drivers that can transfer data to the TEE without using shared > memory from client, it is necessary to receive the user address > directly, bypassing any processing by the TEE subsystem. Introduce > TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT/OUTPUT/INOUT to represent > userspace buffers. > > Reviewed-by: Sumit Garg <sumit.garg(a)oss.qualcomm.com> > Tested-by: Neil Armstrong <neil.armstrong(a)linaro.org> > Tested-by: Harshal Dev <quic_hdev(a)quicinc.com> > Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> > --- > drivers/tee/tee_core.c | 33 +++++++++++++++++++++++++++++++++ > include/linux/tee_drv.h | 6 ++++++ > include/uapi/linux/tee.h | 22 ++++++++++++++++------ > 3 files changed, 55 insertions(+), 6 deletions(-) > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > index f8534a00c56c..bb2e3a6c23a3 100644 > --- a/drivers/tee/tee_core.c > +++ b/drivers/tee/tee_core.c > @@ -457,6 +457,17 @@ static int params_from_user(struct tee_context *ctx, struct tee_param *params, > params[n].u.value.b = ip.b; > params[n].u.value.c = ip.c; > break; > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT: > + params[n].u.ubuf.uaddr = u64_to_user_ptr(ip.a); > + params[n].u.ubuf.size = ip.b; > + > + if (!access_ok(params[n].u.ubuf.uaddr, > + params[n].u.ubuf.size)) > + return -EFAULT; > + > + break; > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: > @@ -490,6 +501,11 @@ static int params_to_user(struct tee_ioctl_param __user *uparams, > put_user(p->u.value.c, &up->c)) > return -EFAULT; > break; > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT: > + if (put_user((u64)p->u.ubuf.size, &up->b)) > + return -EFAULT; > + break; > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: > if (put_user((u64)p->u.memref.size, &up->b)) > @@ -690,6 +706,13 @@ static int params_to_supp(struct tee_context *ctx, > ip.b = p->u.value.b; > ip.c = p->u.value.c; > break; > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT: > + ip.a = (__force u64)p->u.ubuf.uaddr; There's a warning on arm32: drivers/tee/tee_core.c: In function 'params_to_supp': drivers/tee/tee_core.c:821:32: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] 821 | ip.a = (__force u64)p->u.ubuf.uaddr; I think you need to cast to unsigned long instead. Cheers, Jens > + ip.b = p->u.ubuf.size; > + ip.c = 0; > + break; > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: > @@ -792,6 +815,16 @@ static int params_from_supp(struct tee_param *params, size_t num_params, > p->u.value.b = ip.b; > p->u.value.c = ip.c; > break; > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: > + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT: > + p->u.ubuf.uaddr = u64_to_user_ptr(ip.a); > + p->u.ubuf.size = ip.b; > + > + if (!access_ok(params[n].u.ubuf.uaddr, > + params[n].u.ubuf.size)) > + return -EFAULT; > + > + break; > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: > case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: > /* > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h > index 824f1251de60..7915e8869cbd 100644 > --- a/include/linux/tee_drv.h > +++ b/include/linux/tee_drv.h > @@ -82,6 +82,11 @@ struct tee_param_memref { > struct tee_shm *shm; > }; > > +struct tee_param_ubuf { > + void __user *uaddr; > + size_t size; > +}; > + > struct tee_param_value { > u64 a; > u64 b; > @@ -92,6 +97,7 @@ struct tee_param { > u64 attr; > union { > struct tee_param_memref memref; > + struct tee_param_ubuf ubuf; > struct tee_param_value value; > } u; > }; > diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h > index d843cf980d98..0e3b735dcfca 100644 > --- a/include/uapi/linux/tee.h > +++ b/include/uapi/linux/tee.h > @@ -151,6 +151,13 @@ struct tee_ioctl_buf_data { > #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6 > #define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT 7 /* input and output */ > > +/* > + * These defines userspace buffer parameters. > + */ > +#define TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT 8 > +#define TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT 9 > +#define TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT 10 /* input and output */ > + > /* > * Mask for the type part of the attribute, leaves room for more types > */ > @@ -186,14 +193,17 @@ struct tee_ioctl_buf_data { > /** > * struct tee_ioctl_param - parameter > * @attr: attributes > - * @a: if a memref, offset into the shared memory object, else a value parameter > - * @b: if a memref, size of the buffer, else a value parameter > + * @a: if a memref, offset into the shared memory object, > + * else if a ubuf, address of the user buffer, > + * else a value parameter > + * @b: if a memref or ubuf, size of the buffer, else a value parameter > * @c: if a memref, shared memory identifier, else a value parameter > * > - * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in > - * the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and > - * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE > - * indicates that none of the members are used. > + * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref, ubuf, or value is > + * used in the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value, > + * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref, and TEE_PARAM_ATTR_TYPE_UBUF_* > + * indicates ubuf. TEE_PARAM_ATTR_TYPE_NONE indicates that none of the members > + * are used. > * > * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an > * identifier representing the shared memory object. A memref can reference > > -- > 2.34.1 >

1 month

Re: [PATCH v9 00/11] Trusted Execution Environment (TEE) driver for Qualcomm TEE (QTEE)

by Bjorn Andersson

On Mon, Sep 01, 2025 at 09:55:47PM -0700, Amirreza Zarrabi wrote: > This patch series introduces a Trusted Execution Environment (TEE) > driver for Qualcomm TEE (QTEE). QTEE enables Trusted Applications (TAs) > and services to run securely. It uses an object-based interface, where > each service is an object with sets of operations. Clients can invoke > these operations on objects, which can generate results, including other > objects. For example, an object can load a TA and return another object > that represents the loaded TA, allowing access to its services. > > Kernel and userspace services are also available to QTEE through a > similar approach. QTEE makes callback requests that are converted into > object invocations. These objects can represent services within the > kernel or userspace process. > > Note: This patch series focuses on QTEE objects and userspace services. > > Linux already provides a TEE subsystem, which is described in [1]. The > tee subsystem provides a generic ioctl interface, TEE_IOC_INVOKE, which > can be used by userspace to talk to a TEE backend driver. We extend the > Linux TEE subsystem to understand object parameters and an ioctl call so > client can invoke objects in QTEE: > > - TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_* > - TEE_IOC_OBJECT_INVOKE > > The existing ioctl calls TEE_IOC_SUPPL_RECV and TEE_IOC_SUPPL_SEND are > used for invoking services in the userspace process by QTEE. > > The TEE backend driver uses the QTEE Transport Message to communicate > with QTEE. Interactions through the object INVOKE interface are > translated into QTEE messages. Likewise, object invocations from QTEE > for userspace objects are converted into SEND/RECV ioctl calls to > supplicants. > > The details of QTEE Transport Message to communicate with QTEE is > available in [PATCH 12/12] Documentation: tee: Add Qualcomm TEE driver. > > You can run basic tests with following steps: > git clone https://github.com/quic/quic-teec.git > cd quic-teec > mkdir build > cmake .. -DCMAKE_TOOLCHAIN_FILE=CMakeToolchain.txt -DBUILD_UNITTEST=ON > > https://github.com/quic/quic-teec/blob/main/README.md lists dependencies > needed to build the above. > > More comprehensive tests are availabe at > https://github.com/qualcomm/minkipc. > > root@qcom-armv8a:~# qtee_supplicant & > root@qcom-armv8a:~# qtee_supplicant: process entry PPID = 378 > Total listener services to start = 4 > Opening CRequestTABuffer_open > Path /data/ > register_service ::Opening CRegisterTABufCBO_UID > Calling TAbufCBO Register > QTEE_SUPPLICANT RUNNING > > root@qcom-armv8a:~# smcinvoke_client -c /data 1 > Run callback obj test... > Load /data/tzecotestapp.mbn, size 52192, buf 0x1e44ba0. > System Time: 2024-02-27 17:26:31 > PASSED - Callback tests with Buffer inputs. > PASSED - Callback tests with Remote and Callback object inputs. > PASSED - Callback tests with Memory Object inputs. > TEST PASSED! > root@qcom-armv8a:~# > root@qcom-armv8a:~# smcinvoke_client -m /data 1 > Run memory obj test... > Load /data/tzecotestapp.mbn, size 52192, buf 0x26cafba0. > System Time: 2024-02-27 17:26:39 > PASSED - Single Memory Object access Test. > PASSED - Two Memory Object access Test. > TEST PASSED! > > This series has been tested for QTEE object invocations, including > loading a TA, requesting services from the TA, memory sharing, and > handling callback requests to a supplicant. > > Tested platforms: sm8650-mtp, sm8550-qrd, sm8650-qrd, sm8650-hdk > > [1] https://www.kernel.org/doc/Documentation/tee.txt > > Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> > > Changes in v9: > - Remove unnecessary logging in qcom_scm_probe(). > - Replace the platform_device_alloc()/add() sequence with > platform_device_register_data(). > - Fixed sparse warning. > - Fixed documentation typo. > - Link to v8: > https://lore.kernel.org/r/20250820-qcom-tee-using-tee-ss-without-mem-obj-v8… > > Changes in v8: > - Check if arguments to qcom_scm_qtee_invoke_smc() and > qcom_scm_qtee_callback_response() are NULL. > - Add CPU_BIG_ENDIAN as a dependency to Kconfig. > - Fixed kernel bot errors. > - Link to v7: > https://lore.kernel.org/r/20250812-qcom-tee-using-tee-ss-without-mem-obj-v7… > > Changes in v7: > - Updated copyrights. > - Updated Acked-by: tags. > - Fixed kernel bot errors. > - Link to v6: > https://lore.kernel.org/r/20250713-qcom-tee-using-tee-ss-without-mem-obj-v6… > > Changes in v6: > - Relocate QTEE version into the driver's main service structure. > - Simplfies qcomtee_objref_to_arg() and qcomtee_objref_from_arg(). > - Enhanced the return logic of qcomtee_object_do_invoke_internal(). > - Improve comments and remove redundant checks. > - Improve helpers in qcomtee_msh.h to use GENMASK() and FIELD_GET(). > - updated Tested-by:, Acked-by:, and Reviewed-by: tags > - Link to v5: > https://lore.kernel.org/r/20250526-qcom-tee-using-tee-ss-without-mem-obj-v5… > > Changes in v5: > - Remove references to kernel services and public APIs. > - Support auto detection for failing devices (e.g., RB1, RB4). > - Add helpers for obtaining client environment and service objects. > - Query the QTEE version and print it. > - Move remaining static variables, including the object table, to struct > qcomtee. > - Update TEE_MAX_ARG_SIZE to 4096. > - Add a dependancy to QCOM_TZMEM_MODE_SHMBRIDGE in Kconfig > - Reorganize code by removing release.c and qcom_scm.c. > - Add more error messages and improve comments. > - updated Tested-by:, Acked-by:, and Reviewed-by: tags > - Link to v4: https://lore.kernel.org/r/20250428-qcom-tee-using-tee-ss-without-mem-obj-v4… > > Changes in v4: > - Move teedev_ctx_get/put and tee_device_get/put to tee_core.h. > - Rename object to id in struct tee_ioctl_object_invoke_arg. > - Replace spinlock with mutex for qtee_objects_idr. > - Move qcomtee_object_get to qcomtee_user/memobj_param_to_object. > - More code cleanup following the comments. > - Cleanup documentations. > - Update MAINTAINERS file. > - Link to v3: https://lore.kernel.org/r/20250327-qcom-tee-using-tee-ss-without-mem-obj-v3… > > Changes in v3: > - Export shm_bridge create/delete APIs. > - Enable support for QTEE memory objects. > - Update the memory management code to use the TEE subsystem for all > allocations using the pool. > - Move all driver states into the driver's main service struct. > - Add more documentations. > - Link to v2: https://lore.kernel.org/r/20250202-qcom-tee-using-tee-ss-without-mem-obj-v2… > > Changes in v2: > - Clean up commit messages and comments. > - Use better names such as ubuf instead of membuf or QCOMTEE prefix > instead of QCOM_TEE, or names that are more consistent with other > TEE-backend drivers such as qcomtee_context_data instead of > qcom_tee_context. > - Drop the DTS patch and instantiate the device from the scm driver. > - Use a single structure for all driver's internal states. > - Drop srcu primitives and use the existing mutex for synchronization > between the supplicant and QTEE. > - Directly use tee_context to track the lifetime of qcomtee_context_data. > - Add close_context() to be called when the user closes the tee_context. > - Link to v1: https://lore.kernel.org/r/20241202-qcom-tee-using-tee-ss-without-mem-obj-v1… > > Changes in v1: > - It is a complete rewrite to utilize the TEE subsystem. > - Link to RFC: https://lore.kernel.org/all/20240702-qcom-tee-object-and-ioctls-v1-0-633c3d… > > --- > Amirreza Zarrabi (11): > tee: allow a driver to allocate a tee_device without a pool > tee: add close_context to TEE driver operation > tee: add TEE_IOCTL_PARAM_ATTR_TYPE_UBUF > tee: add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF > tee: increase TEE_MAX_ARG_SIZE to 4096 > firmware: qcom: scm: add support for object invocation > firmware: qcom: tzmem: export shm_bridge create/delete These two patches are for code maintained by me, the rest by Jens. So we will have to dance to get this merged. Is there are reason why these two are in the middle of the series? Do they need to come after the first 5 but before the next 3? Regards, Bjorn > tee: add Qualcomm TEE driver > tee: qcom: add primordial object > tee: qcom: enable TEE_IOC_SHM_ALLOC ioctl > Documentation: tee: Add Qualcomm TEE driver > > Documentation/tee/index.rst | 1 + > Documentation/tee/qtee.rst | 96 ++++ > MAINTAINERS | 7 + > drivers/firmware/qcom/qcom_scm.c | 124 +++++ > drivers/firmware/qcom/qcom_scm.h | 7 + > drivers/firmware/qcom/qcom_tzmem.c | 63 ++- > drivers/tee/Kconfig | 1 + > drivers/tee/Makefile | 1 + > drivers/tee/qcomtee/Kconfig | 12 + > drivers/tee/qcomtee/Makefile | 9 + > drivers/tee/qcomtee/async.c | 182 ++++++ > drivers/tee/qcomtee/call.c | 820 +++++++++++++++++++++++++++ > drivers/tee/qcomtee/core.c | 915 +++++++++++++++++++++++++++++++ > drivers/tee/qcomtee/mem_obj.c | 169 ++++++ > drivers/tee/qcomtee/primordial_obj.c | 113 ++++ > drivers/tee/qcomtee/qcomtee.h | 185 +++++++ > drivers/tee/qcomtee/qcomtee_msg.h | 304 ++++++++++ > drivers/tee/qcomtee/qcomtee_object.h | 316 +++++++++++ > drivers/tee/qcomtee/shm.c | 150 +++++ > drivers/tee/qcomtee/user_obj.c | 692 +++++++++++++++++++++++ > drivers/tee/tee_core.c | 127 ++++- > drivers/tee/tee_private.h | 6 - > include/linux/firmware/qcom/qcom_scm.h | 6 + > include/linux/firmware/qcom/qcom_tzmem.h | 15 + > include/linux/tee_core.h | 54 +- > include/linux/tee_drv.h | 12 + > include/uapi/linux/tee.h | 56 +- > 27 files changed, 4415 insertions(+), 28 deletions(-) > --- > base-commit: 33bcf93b9a6b028758105680f8b538a31bc563cf > change-id: 20241202-qcom-tee-using-tee-ss-without-mem-obj-362c66340527 > > Best regards, > -- > Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> >

1 month

Re: [PATCH v9 06/11] firmware: qcom: scm: add support for object invocation

by Bjorn Andersson

On Mon, Sep 01, 2025 at 09:55:53PM -0700, Amirreza Zarrabi wrote: > Qualcomm TEE (QTEE) hosts Trusted Applications (TAs) and services in > the secure world, accessed via objects. A QTEE client can invoke these > objects to request services. Similarly, QTEE can request services from > the nonsecure world using objects exported to the secure world. > > Add low-level primitives to facilitate the invocation of objects hosted > in QTEE, as well as those hosted in the nonsecure world. > > If support for object invocation is available, the qcom_scm allocates > a dedicated child platform device. The driver for this device communicates > with QTEE using low-level primitives. > > Tested-by: Neil Armstrong <neil.armstrong(a)linaro.org> > Tested-by: Harshal Dev <quic_hdev(a)quicinc.com> > Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> > --- > drivers/firmware/qcom/qcom_scm.c | 124 +++++++++++++++++++++++++++++++++ > drivers/firmware/qcom/qcom_scm.h | 7 ++ > include/linux/firmware/qcom/qcom_scm.h | 6 ++ > 3 files changed, 137 insertions(+) > > diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c > index edeae6cdcf31..739ee9819549 100644 > --- a/drivers/firmware/qcom/qcom_scm.c > +++ b/drivers/firmware/qcom/qcom_scm.c > @@ -2094,6 +2094,127 @@ static int qcom_scm_qseecom_init(struct qcom_scm *scm) > > #endif /* CONFIG_QCOM_QSEECOM */ > > +/** > + * qcom_scm_qtee_invoke_smc() - Invoke a QTEE object. > + * @inbuf: start address of memory area used for inbound buffer. > + * @inbuf_size: size of the memory area used for inbound buffer. > + * @outbuf: start address of memory area used for outbound buffer. > + * @outbuf_size: size of the memory area used for outbound buffer. > + * @result: result of QTEE object invocation. > + * @response_type: response type returned by QTEE. > + * > + * @response_type determines how the contents of @inbuf and @outbuf > + * should be processed. > + * > + * Return: On success, return 0 or <0 on failure. > + */ > +int qcom_scm_qtee_invoke_smc(phys_addr_t inbuf, size_t inbuf_size, > + phys_addr_t outbuf, size_t outbuf_size, > + u64 *result, u64 *response_type) > +{ > + struct qcom_scm_desc desc = { > + .svc = QCOM_SCM_SVC_SMCINVOKE, > + .cmd = QCOM_SCM_SMCINVOKE_INVOKE, > + .owner = ARM_SMCCC_OWNER_TRUSTED_OS, > + .args[0] = inbuf, > + .args[1] = inbuf_size, > + .args[2] = outbuf, > + .args[3] = outbuf_size, > + .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_RW, QCOM_SCM_VAL, > + QCOM_SCM_RW, QCOM_SCM_VAL), > + }; > + struct qcom_scm_res res; > + int ret; > + > + ret = qcom_scm_call(__scm->dev, &desc, &res); > + if (ret) > + return ret; > + > + if (response_type) > + *response_type = res.result[0]; > + > + if (result) > + *result = res.result[1]; > + > + return 0; > +} > +EXPORT_SYMBOL(qcom_scm_qtee_invoke_smc); > + > +/** > + * qcom_scm_qtee_callback_response() - Submit response for callback request. > + * @buf: start address of memory area used for outbound buffer. > + * @buf_size: size of the memory area used for outbound buffer. > + * @result: Result of QTEE object invocation. > + * @response_type: Response type returned by QTEE. > + * > + * @response_type determines how the contents of @buf should be processed. > + * > + * Return: On success, return 0 or <0 on failure. > + */ > +int qcom_scm_qtee_callback_response(phys_addr_t buf, size_t buf_size, > + u64 *result, u64 *response_type) > +{ > + struct qcom_scm_desc desc = { > + .svc = QCOM_SCM_SVC_SMCINVOKE, > + .cmd = QCOM_SCM_SMCINVOKE_CB_RSP, > + .owner = ARM_SMCCC_OWNER_TRUSTED_OS, > + .args[0] = buf, > + .args[1] = buf_size, > + .arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL), > + }; > + struct qcom_scm_res res; > + int ret; > + > + ret = qcom_scm_call(__scm->dev, &desc, &res); > + if (ret) > + return ret; > + > + if (response_type) > + *response_type = res.result[0]; > + > + if (result) > + *result = res.result[1]; > + > + return 0; > +} > +EXPORT_SYMBOL(qcom_scm_qtee_callback_response); > + > +static void qcom_scm_qtee_free(void *data) > +{ > + struct platform_device *qtee_dev = data; > + > + platform_device_unregister(qtee_dev); > +} > + > +static void qcom_scm_qtee_init(struct qcom_scm *scm) > +{ > + struct platform_device *qtee_dev; > + u64 result, response_type; > + int ret; > + > + /* > + * Probe for smcinvoke support. This will fail due to invalid buffers, > + * but first, it checks whether the call is supported in QTEE syscall > + * handler. If it is not supported, -EIO is returned. > + */ > + ret = qcom_scm_qtee_invoke_smc(0, 0, 0, 0, &result, &response_type); > + if (ret == -EIO) > + return; > + > + /* Setup QTEE interface device. */ > + qtee_dev = platform_device_register_data(scm->dev, "qcomtee", > + PLATFORM_DEVID_NONE, NULL, 0); > + if (IS_ERR(qtee_dev)) { > + dev_err(scm->dev, "qcomtee: register failed: %d\n", > + PTR_ERR(qtee_dev)); This isn't going to fail, and all expected paths that it would fail will be -ENOMEM which already printed a warning. So, I'd suggest that you resolve the LKP build warning by dropping the print. > + return; > + } > + > + ret = devm_add_action_or_reset(scm->dev, qcom_scm_qtee_free, qtee_dev); > + if (ret) > + dev_err(scm->dev, "qcomtee: add action failed: %d\n", ret); The only possible error here is -ENOMEM, so you can skip the print. Regards, Bjorn > +} > + > /** > * qcom_scm_is_available() - Checks if SCM is available > */ > @@ -2326,6 +2447,9 @@ static int qcom_scm_probe(struct platform_device *pdev) > ret = qcom_scm_qseecom_init(scm); > WARN(ret < 0, "failed to initialize qseecom: %d\n", ret); > > + /* Initialize the QTEE object interface. */ > + qcom_scm_qtee_init(scm); > + > return 0; > } > > diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h > index 0e8dd838099e..a56c8212cc0c 100644 > --- a/drivers/firmware/qcom/qcom_scm.h > +++ b/drivers/firmware/qcom/qcom_scm.h > @@ -156,6 +156,13 @@ int qcom_scm_shm_bridge_enable(struct device *scm_dev); > #define QCOM_SCM_SVC_GPU 0x28 > #define QCOM_SCM_SVC_GPU_INIT_REGS 0x01 > > +/* ARM_SMCCC_OWNER_TRUSTED_OS calls */ > + > +#define QCOM_SCM_SVC_SMCINVOKE 0x06 > +#define QCOM_SCM_SMCINVOKE_INVOKE_LEGACY 0x00 > +#define QCOM_SCM_SMCINVOKE_CB_RSP 0x01 > +#define QCOM_SCM_SMCINVOKE_INVOKE 0x02 > + > /* common error codes */ > #define QCOM_SCM_V2_EBUSY -12 > #define QCOM_SCM_ENOMEM -5 > diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h > index 0f667bf1d4d9..a55ca771286b 100644 > --- a/include/linux/firmware/qcom/qcom_scm.h > +++ b/include/linux/firmware/qcom/qcom_scm.h > @@ -175,4 +175,10 @@ static inline int qcom_scm_qseecom_app_send(u32 app_id, > > #endif /* CONFIG_QCOM_QSEECOM */ > > +int qcom_scm_qtee_invoke_smc(phys_addr_t inbuf, size_t inbuf_size, > + phys_addr_t outbuf, size_t outbuf_size, > + u64 *result, u64 *response_type); > +int qcom_scm_qtee_callback_response(phys_addr_t buf, size_t buf_size, > + u64 *result, u64 *response_type); > + > #endif > > -- > 2.34.1 >

1 month

Re: [PATCH v7 00/11] Trusted Execution Environment (TEE) driver for Qualcomm TEE (QTEE)

by Jens Wiklander

On Tue, Sep 9, 2025 at 6:34 AM Sumit Garg <sumit.garg(a)kernel.org> wrote: > > On Tue, Aug 12, 2025 at 05:35:29PM -0700, Amirreza Zarrabi wrote: > > This patch series introduces a Trusted Execution Environment (TEE) > > driver for Qualcomm TEE (QTEE). QTEE enables Trusted Applications (TAs) > > and services to run securely. It uses an object-based interface, where > > each service is an object with sets of operations. Clients can invoke > > these operations on objects, which can generate results, including other > > objects. For example, an object can load a TA and return another object > > that represents the loaded TA, allowing access to its services. > > > > Kernel and userspace services are also available to QTEE through a > > similar approach. QTEE makes callback requests that are converted into > > object invocations. These objects can represent services within the > > kernel or userspace process. > > > > Note: This patch series focuses on QTEE objects and userspace services. > > > > Linux already provides a TEE subsystem, which is described in [1]. The > > tee subsystem provides a generic ioctl interface, TEE_IOC_INVOKE, which > > can be used by userspace to talk to a TEE backend driver. We extend the > > Linux TEE subsystem to understand object parameters and an ioctl call so > > client can invoke objects in QTEE: > > > > - TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_* > > - TEE_IOC_OBJECT_INVOKE > > > > The existing ioctl calls TEE_IOC_SUPPL_RECV and TEE_IOC_SUPPL_SEND are > > used for invoking services in the userspace process by QTEE. > > > > The TEE backend driver uses the QTEE Transport Message to communicate > > with QTEE. Interactions through the object INVOKE interface are > > translated into QTEE messages. Likewise, object invocations from QTEE > > for userspace objects are converted into SEND/RECV ioctl calls to > > supplicants. > > > > The details of QTEE Transport Message to communicate with QTEE is > > available in [PATCH 12/12] Documentation: tee: Add Qualcomm TEE driver. > > > > You can run basic tests with following steps: > > git clone https://github.com/quic/quic-teec.git > > cd quic-teec > > mkdir build > > cmake .. -DCMAKE_TOOLCHAIN_FILE=CMakeToolchain.txt -DBUILD_UNITTEST=ON > > > > https://github.com/quic/quic-teec/blob/main/README.md lists dependencies > > needed to build the above. > > > > More comprehensive tests are availabe at > > https://github.com/qualcomm/minkipc. > > > > root@qcom-armv8a:~# qtee_supplicant & > > root@qcom-armv8a:~# qtee_supplicant: process entry PPID = 378 > > Total listener services to start = 4 > > Opening CRequestTABuffer_open > > Path /data/ > > register_service ::Opening CRegisterTABufCBO_UID > > Calling TAbufCBO Register > > QTEE_SUPPLICANT RUNNING > > > > root@qcom-armv8a:~# smcinvoke_client -c /data 1 > > Run callback obj test... > > Load /data/tzecotestapp.mbn, size 52192, buf 0x1e44ba0. > > System Time: 2024-02-27 17:26:31 > > PASSED - Callback tests with Buffer inputs. > > PASSED - Callback tests with Remote and Callback object inputs. > > PASSED - Callback tests with Memory Object inputs. > > TEST PASSED! > > root@qcom-armv8a:~# > > root@qcom-armv8a:~# smcinvoke_client -m /data 1 > > Run memory obj test... > > Load /data/tzecotestapp.mbn, size 52192, buf 0x26cafba0. > > System Time: 2024-02-27 17:26:39 > > PASSED - Single Memory Object access Test. > > PASSED - Two Memory Object access Test. > > TEST PASSED! > > > > This series has been tested for QTEE object invocations, including > > loading a TA, requesting services from the TA, memory sharing, and > > handling callback requests to a supplicant. > > > > Tested platforms: sm8650-mtp, sm8550-qrd, sm8650-qrd, sm8650-hdk > > > > [1] https://www.kernel.org/doc/Documentation/tee.txt > > > > Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> > > > > At this point, I think this series is ready to be applied to linux-next. There are still some warnings in "[PATCH v9 06/11] firmware: qcom: scm: add support for object invocation" /Jens > > > Changes in v7: > > - Updated copyrights. > > - Updated Acked-by: tags. > > - Fixed kernel bot errors. > > - Link to v6: > > https://lore.kernel.org/r/20250713-qcom-tee-using-tee-ss-without-mem-obj-v6… > > > > Changes in v6: > > - Relocate QTEE version into the driver's main service structure. > > - Simplfies qcomtee_objref_to_arg() and qcomtee_objref_from_arg(). > > - Enhanced the return logic of qcomtee_object_do_invoke_internal(). > > - Improve comments and remove redundant checks. > > - Improve helpers in qcomtee_msh.h to use GENMASK() and FIELD_GET(). > > - updated Tested-by:, Acked-by:, and Reviewed-by: tags > > - Link to v5: > > https://lore.kernel.org/r/20250526-qcom-tee-using-tee-ss-without-mem-obj-v5… > > > > Changes in v5: > > - Remove references to kernel services and public APIs. > > - Support auto detection for failing devices (e.g., RB1, RB4). > > - Add helpers for obtaining client environment and service objects. > > - Query the QTEE version and print it. > > - Move remaining static variables, including the object table, to struct > > qcomtee. > > - Update TEE_MAX_ARG_SIZE to 4096. > > - Add a dependancy to QCOM_TZMEM_MODE_SHMBRIDGE in Kconfig > > - Reorganize code by removing release.c and qcom_scm.c. > > - Add more error messages and improve comments. > > - updated Tested-by:, Acked-by:, and Reviewed-by: tags > > - Link to v4: https://lore.kernel.org/r/20250428-qcom-tee-using-tee-ss-without-mem-obj-v4… > > > > Changes in v4: > > - Move teedev_ctx_get/put and tee_device_get/put to tee_core.h. > > - Rename object to id in struct tee_ioctl_object_invoke_arg. > > - Replace spinlock with mutex for qtee_objects_idr. > > - Move qcomtee_object_get to qcomtee_user/memobj_param_to_object. > > - More code cleanup following the comments. > > - Cleanup documentations. > > - Update MAINTAINERS file. > > - Link to v3: https://lore.kernel.org/r/20250327-qcom-tee-using-tee-ss-without-mem-obj-v3… > > > > Changes in v3: > > - Export shm_bridge create/delete APIs. > > - Enable support for QTEE memory objects. > > - Update the memory management code to use the TEE subsystem for all > > allocations using the pool. > > - Move all driver states into the driver's main service struct. > > - Add more documentations. > > - Link to v2: https://lore.kernel.org/r/20250202-qcom-tee-using-tee-ss-without-mem-obj-v2… > > > > Changes in v2: > > - Clean up commit messages and comments. > > - Use better names such as ubuf instead of membuf or QCOMTEE prefix > > instead of QCOM_TEE, or names that are more consistent with other > > TEE-backend drivers such as qcomtee_context_data instead of > > qcom_tee_context. > > - Drop the DTS patch and instantiate the device from the scm driver. > > - Use a single structure for all driver's internal states. > > - Drop srcu primitives and use the existing mutex for synchronization > > between the supplicant and QTEE. > > - Directly use tee_context to track the lifetime of qcomtee_context_data. > > - Add close_context() to be called when the user closes the tee_context. > > - Link to v1: https://lore.kernel.org/r/20241202-qcom-tee-using-tee-ss-without-mem-obj-v1… > > > > Changes in v1: > > - It is a complete rewrite to utilize the TEE subsystem. > > - Link to RFC: https://lore.kernel.org/all/20240702-qcom-tee-object-and-ioctls-v1-0-633c3d… > > > > --- > > Amirreza Zarrabi (11): > > tee: allow a driver to allocate a tee_device without a pool > > tee: add close_context to TEE driver operation > > tee: add TEE_IOCTL_PARAM_ATTR_TYPE_UBUF > > tee: add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF > > tee: increase TEE_MAX_ARG_SIZE to 4096 > > > firmware: qcom: scm: add support for object invocation > > firmware: qcom: tzmem: export shm_bridge create/delete > > Bjorn/Konrad, > > Since majority of this series belong to TEE subsystem, are you folks > fine to ack these patches for Jens to pick them up for next? > > -Sumit > > > tee: add Qualcomm TEE driver > > qcomtee: add primordial object > > qcomtee: enable TEE_IOC_SHM_ALLOC ioctl > > Documentation: tee: Add Qualcomm TEE driver > > > > > > > Documentation/tee/index.rst | 1 + > > Documentation/tee/qtee.rst | 96 ++++ > > MAINTAINERS | 7 + > > drivers/firmware/qcom/qcom_scm.c | 128 +++++ > > drivers/firmware/qcom/qcom_scm.h | 7 + > > drivers/firmware/qcom/qcom_tzmem.c | 63 ++- > > drivers/tee/Kconfig | 1 + > > drivers/tee/Makefile | 1 + > > drivers/tee/qcomtee/Kconfig | 11 + > > drivers/tee/qcomtee/Makefile | 9 + > > drivers/tee/qcomtee/async.c | 183 ++++++ > > drivers/tee/qcomtee/call.c | 820 +++++++++++++++++++++++++++ > > drivers/tee/qcomtee/core.c | 920 +++++++++++++++++++++++++++++++ > > drivers/tee/qcomtee/mem_obj.c | 169 ++++++ > > drivers/tee/qcomtee/primordial_obj.c | 116 ++++ > > drivers/tee/qcomtee/qcomtee.h | 185 +++++++ > > drivers/tee/qcomtee/qcomtee_msg.h | 300 ++++++++++ > > drivers/tee/qcomtee/qcomtee_object.h | 316 +++++++++++ > > drivers/tee/qcomtee/shm.c | 150 +++++ > > drivers/tee/qcomtee/user_obj.c | 692 +++++++++++++++++++++++ > > drivers/tee/tee_core.c | 127 ++++- > > drivers/tee/tee_private.h | 6 - > > include/linux/firmware/qcom/qcom_scm.h | 6 + > > include/linux/firmware/qcom/qcom_tzmem.h | 15 + > > include/linux/tee_core.h | 54 +- > > include/linux/tee_drv.h | 12 + > > include/uapi/linux/tee.h | 56 +- > > 27 files changed, 4423 insertions(+), 28 deletions(-) > > --- > > base-commit: 2674d1eadaa2fd3a918dfcdb6d0bb49efe8a8bb9 > > change-id: 20241202-qcom-tee-using-tee-ss-without-mem-obj-362c66340527 > > > > Best regards, > > -- > > Amirreza Zarrabi <amirreza.zarrabi(a)oss.qualcomm.com> > > > >

1 month

Re: [PATCH v7 2/2] i2c: i2c-qcom-geni: Add Block event interrupt support

by kernel test robot

Hi Jyothi, kernel test robot noticed the following build warnings: [auto build test WARNING on vkoul-dmaengine/next] [also build test WARNING on andi-shyti/i2c/i2c-host linus/master v6.17-rc4 next-20250905] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Jyothi-Kumar-Seerapu/dmaengi… base: https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git next patch link: https://lore.kernel.org/r/20250903073059.2151837-3-quic_jseerapu%40quicinc.… patch subject: [PATCH v7 2/2] i2c: i2c-qcom-geni: Add Block event interrupt support config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20250906/202509062008.lSOdhd4U-lkp@…) compiler: gcc-13 (Debian 13.3.0-16) 13.3.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250906/202509062008.lSOdhd4U-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509062008.lSOdhd4U-lkp@intel.com/ All warnings (new ones prefixed by >>): drivers/i2c/busses/i2c-qcom-geni.c: In function 'geni_i2c_gpi_multi_desc_unmap': >> drivers/i2c/busses/i2c-qcom-geni.c:576:42: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] 576 | NULL, (dma_addr_t)NULL); | ^ vim +576 drivers/i2c/busses/i2c-qcom-geni.c 555 556 /** 557 * geni_i2c_gpi_multi_desc_unmap() - Unmaps DMA buffers post multi message TX transfers 558 * @gi2c: I2C dev handle 559 * @msgs: Array of I2C messages 560 * @peripheral: Pointer to gpi_i2c_config 561 */ 562 static void geni_i2c_gpi_multi_desc_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], 563 struct gpi_i2c_config *peripheral) 564 { 565 u32 msg_xfer_cnt, wr_idx = 0; 566 struct geni_i2c_gpi_multi_desc_xfer *tx_multi_xfer = &gi2c->i2c_multi_desc_config; 567 568 msg_xfer_cnt = gi2c->err ? tx_multi_xfer->msg_idx_cnt : tx_multi_xfer->irq_cnt; 569 570 /* Unmap the processed DMA buffers based on the received interrupt count */ 571 for (; tx_multi_xfer->unmap_msg_cnt < msg_xfer_cnt; tx_multi_xfer->unmap_msg_cnt++) { 572 wr_idx = tx_multi_xfer->unmap_msg_cnt; 573 geni_i2c_gpi_unmap(gi2c, &msgs[wr_idx], 574 tx_multi_xfer->dma_buf[wr_idx], 575 tx_multi_xfer->dma_addr[wr_idx], > 576 NULL, (dma_addr_t)NULL); 577 578 if (tx_multi_xfer->unmap_msg_cnt == gi2c->num_msgs - 1) { 579 kfree(tx_multi_xfer->dma_buf); 580 kfree(tx_multi_xfer->dma_addr); 581 break; 582 } 583 } 584 } 585 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 month, 1 week

[PATCH 0/9] dma-buf: heaps: Add Tegra VPR support

by Thierry Reding

From: Thierry Reding <treding(a)nvidia.com> Hi, This series adds support for the video protection region (VPR) used on Tegra SoC devices. It's a special region of memory that is protected from accesses by the CPU and used to store DRM protected content (both decrypted stream data as well as decoded video frames). Patches 1 and 2 add DT binding documentation for the VPR and add the VPR to the list of memory-region items for display and host1x. Patch 3 introduces new APIs needed by the Tegra VPR implementation that allow CMA areas to be dynamically created at runtime rather than using the fixed, system-wide list. This is used in this driver specifically because it can use an arbitrary number of these areas (though they are currently limited to 4). Patch 4 adds some infrastructure for DMA heap implementations to provide information through debugfs. The Tegra VPR implementation is added in patch 5. See its commit message for more details about the specifics of this implementation. Finally, patches 6-9 add the VPR placeholder node on Tegra234 and hook it up to the host1x and GPU nodes so that they can make use of this region. Thierry Thierry Reding (9): dt-bindings: reserved-memory: Document Tegra VPR dt-bindings: display: tegra: Document memory regions mm/cma: Allow dynamically creating CMA areas dma-buf: heaps: Add debugfs support dma-buf: heaps: Add support for Tegra VPR arm64: tegra: Add VPR placeholder node on Tegra234 arm64: tegra: Add GPU node on Tegra234 arm64: tegra: Hook up VPR to host1x arm64: tegra: Hook up VPR to the GPU .../display/tegra/nvidia,tegra186-dc.yaml | 10 + .../display/tegra/nvidia,tegra20-dc.yaml | 10 +- .../display/tegra/nvidia,tegra20-host1x.yaml | 7 + .../nvidia,tegra-video-protection-region.yaml | 55 ++ arch/arm64/boot/dts/nvidia/tegra234.dtsi | 57 ++ drivers/dma-buf/dma-heap.c | 56 ++ drivers/dma-buf/heaps/Kconfig | 7 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/tegra-vpr.c | 831 ++++++++++++++++++ include/linux/cma.h | 16 + include/linux/dma-heap.h | 2 + include/trace/events/tegra_vpr.h | 57 ++ mm/cma.c | 89 +- 13 files changed, 1175 insertions(+), 23 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/nvidia,tegra-video-protection-region.yaml create mode 100644 drivers/dma-buf/heaps/tegra-vpr.c create mode 100644 include/trace/events/tegra_vpr.h -- 2.50.0

1 month, 1 week

Re: [PATCH 3/9] mm/cma: Allow dynamically creating CMA areas

by Thierry Reding

On Wed, Sep 03, 2025 at 09:41:18AM -0700, Frank van der Linden wrote: > On Wed, Sep 3, 2025 at 9:05 AM Thierry Reding <thierry.reding(a)gmail.com> wrote: > > > > On Tue, Sep 02, 2025 at 10:27:01AM -0700, Frank van der Linden wrote: > > > On Tue, Sep 2, 2025 at 8:46 AM Thierry Reding <thierry.reding(a)gmail.com> wrote: > > > > > > > > From: Thierry Reding <treding(a)nvidia.com> > > > > > > > > There is no technical reason why there should be a limited number of CMA > > > > regions, so extract some code into helpers and use them to create extra > > > > functions (cma_create() and cma_free()) that allow creating and freeing, > > > > respectively, CMA regions dynamically at runtime. > > > > > > > > Note that these dynamically created CMA areas are treated specially and > > > > do not contribute to the number of total CMA pages so that this count > > > > still only applies to the fixed number of CMA areas. > > > > > > > > Signed-off-by: Thierry Reding <treding(a)nvidia.com> > > > > --- > > > > include/linux/cma.h | 16 ++++++++ > > > > mm/cma.c | 89 ++++++++++++++++++++++++++++++++++----------- > > > > 2 files changed, 83 insertions(+), 22 deletions(-) > > [...] > > > I agree that supporting dynamic CMA areas would be good. However, by > > > doing it like this, these CMA areas are invisible to the rest of the > > > system. E.g. cma_for_each_area() does not know about them. It seems a > > > bit inconsistent that there will now be some areas that are globally > > > known, and some that are not. > > > > That was kind of the point of this experiment. When I started on this I > > ran into the case where I was running out of predefined CMA areas and as > > I went looking for ways on how to fix this, I realized that there's not > > much reason to keep a global list of these areas. And even less reason > > to limit the number of CMA areas to this predefined list. Very little > > code outside of the core CMA code even uses this. > > > > There's one instance of cma_for_each_area() that I don't grok. There's > > another early MMU fixup for CMA areas in 32-bit ARM that. Other than > > that there's a few places where the total CMA page count is shown for > > informational purposes and I don't know how useful that really is > > because totalcma_pages doesn't really track how many pages are used for > > CMA, but pages that could potentially be used for CMA. > > > > And that's about it. > > > > It seems like there are cases where we might really need to globally > > know about some of these areas, specifically ones that are allocated > > very early during boot and then used for very specific purposes. > > > > However, it seems to me like CMA is more universally useful than just > > for these cases and I don't see the usefulness of tracking these more > > generic uses. > > > > > I am being somewhat selfish here, as I have some WIP code that needs > > > the global list :-) But I think the inconsistency is a more general > > > point than just what I want (and the s390 code does use > > > cma_for_each_area()). Maybe you could keep maintaining a global > > > structure containing all areas? > > > > If it's really useful to be able to access all CMA areas, then we could > > easily just add them all to a global linked list upon activation (we may > > still want/need to keep the predefined list around for all those early > > allocation cases). That way we'd get the best of both worlds. > > > > > What do you think are the chances of running out of the global count > > > of areas? > > > > Well, I did run out of CMA areas during the early VPR testing because I > > was initially testing with 16 areas and a different allocation scheme > > that turned out to cause too many resizes in common cases. > > > > However, given that the default is 8 on normal systems (20 on NUMA) and > > is configurable, it means that even with restricting this to 4 for VPR > > doesn't always guarantee that all 4 are available. Again, yes, we could > > keep bumping that number, but why not turn this into something a bit > > more robust where nobody has to know or care about how many there are? > > > > > Also, you say that "these are treated specially and do not contribute > > > to the number of total CMA pages". But, if I'm reading this right, you > > > do call cma_activate_area(), which will do > > > init_cma_reserved_pageblock() for each pageblock in it. Which adjusts > > > the CMA counters for the zone they are in. But your change does not > > > adjust totalcma_pages for dynamically created areas. That seems > > > inconsistent, too. > > > > I was referring to just totalcma_pages that isn't impacted by these > > dynamically allocated regions. This is, again, because I don't see why > > that information would be useful. It's a fairly easy change to update > > that value, so if people prefer that, I can add that. > > > > I don't see an immediate connection between totalcma_pages and > > init_cma_reserved_pageblock(). I thought the latter was primarily useful > > for making sure that the CMA pages can be migrated, which is still > > critical for this use-case. > > My comment was about statistics, they would be inconsistent after your > change. E.g. currently, totalcma_pages is equal to the sum of CMA > pages in each zone. But that would no longer be true, and applications > / administrators looking at those statistics might see the > inconsistency (between meminfo and vmstat) and wonder what's going on. > It seems best to keep those numbers in sync. > > In general, I think it's fine to support dynamic allocation, and I > agree with your arguments that it doesn't seem right to set the number > of CMA areas via a config option. I would just like there to be a > canonical way to find all CMA areas. Okay, so judging by your and David's feedback, it sounds like I should add a bit of code to track dynamically allocated areas within a global list, along with the existing predefined regions and keep totalcma_pages updated so that the global view is consistent. I'll look into that. Thanks for the feedback. Thierry

1 month, 1 week

Re: [PATCH v5 3/3] drm: tiny: Add support for Mayqueen Pixpaper e-ink panel

by Thomas Zimmermann

Hi Am 02.09.25 um 08:53 schrieb LiangCheng Wang: > Introduce a DRM driver for the Mayqueen Pixpaper e-ink display panel, > which is controlled via SPI. The driver supports a 122x250 resolution > display with XRGB8888 format. > > Also, add a MAINTAINERS entry for the Pixpaper driver. > > Signed-off-by: LiangCheng Wang <zaq14760(a)gmail.com> Reviewed-by: Thomas Zimmermann <tzimmermann(a)suse.de> Thank you so much for the driver. I will merge the series into drm-misc-next soon. Best regards Thomas > --- > MAINTAINERS | 7 + > drivers/gpu/drm/tiny/Kconfig | 15 + > drivers/gpu/drm/tiny/Makefile | 1 + > drivers/gpu/drm/tiny/pixpaper.c | 1171 +++++++++++++++++++++++++++++++++++++++ > 4 files changed, 1194 insertions(+) > > diff --git a/MAINTAINERS b/MAINTAINERS > index 6dcfbd11efef87927041f5cf58d70633dbb4b18d..790bc2d0b34fc08e9f73c9caa1e6ddada57d07ac 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -7866,6 +7866,13 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git > F: Documentation/devicetree/bindings/display/repaper.txt > F: drivers/gpu/drm/tiny/repaper.c > > +DRM DRIVER FOR PIXPAPER E-INK PANEL > +M: LiangCheng Wang <zaq14760(a)gmail.com> > +L: dri-devel(a)lists.freedesktop.org > +S: Maintained > +F: Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml > +F: drivers/gpu/drm/tiny/pixpaper.c > + > DRM DRIVER FOR QEMU'S CIRRUS DEVICE > M: Dave Airlie <airlied(a)redhat.com> > M: Gerd Hoffmann <kraxel(a)redhat.com> > diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig > index 06e54694a7f2fe1649e1886f039926b24f698e0d..94a5bf61a115929640022128e20c723ab7c0e735 100644 > --- a/drivers/gpu/drm/tiny/Kconfig > +++ b/drivers/gpu/drm/tiny/Kconfig > @@ -82,6 +82,21 @@ config DRM_PANEL_MIPI_DBI > https://github.com/notro/panel-mipi-dbi/wiki. > To compile this driver as a module, choose M here. > > +config DRM_PIXPAPER > + tristate "DRM support for PIXPAPER display panels" > + depends on DRM && SPI > + select DRM_CLIENT_SELECTION > + select DRM_GEM_DMA_HELPER > + select DRM_KMS_HELPER > + help > + DRM driver for the Mayqueen Pixpaper e-ink display panel. > + > + This driver supports small e-paper displays connected over SPI, > + with a resolution of 122x250 and XRGB8888 framebuffer format. > + It is intended for low-power embedded applications. > + > + If M is selected, the module will be built as pixpaper.ko. > + > config TINYDRM_HX8357D > tristate "DRM support for HX8357D display panels" > depends on DRM && SPI > diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile > index 4a9ff61ec25420e2c0a648c04eaab7ca25dd5407..48d30bf6152f979404ac1004174587823a30109e 100644 > --- a/drivers/gpu/drm/tiny/Makefile > +++ b/drivers/gpu/drm/tiny/Makefile > @@ -6,6 +6,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs.o > obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus-qemu.o > obj-$(CONFIG_DRM_GM12U320) += gm12u320.o > obj-$(CONFIG_DRM_PANEL_MIPI_DBI) += panel-mipi-dbi.o > +obj-$(CONFIG_DRM_PIXPAPER) += pixpaper.o > obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o > obj-$(CONFIG_TINYDRM_ILI9163) += ili9163.o > obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o > diff --git a/drivers/gpu/drm/tiny/pixpaper.c b/drivers/gpu/drm/tiny/pixpaper.c > new file mode 100644 > index 0000000000000000000000000000000000000000..80ac8af1ba280483d3d210f10f5143441764ee94 > --- /dev/null > +++ b/drivers/gpu/drm/tiny/pixpaper.c > @@ -0,0 +1,1171 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * DRM driver for PIXPAPER e-ink panel > + * > + * Author: LiangCheng Wang <zaq14760(a)gmail.com>, > + */ > +#include <linux/delay.h> > +#include <linux/module.h> > +#include <linux/spi/spi.h> > + > +#include <drm/clients/drm_client_setup.h> > +#include <drm/drm_atomic.h> > +#include <drm/drm_atomic_helper.h> > +#include <drm/drm_drv.h> > +#include <drm/drm_fbdev_shmem.h> > +#include <drm/drm_framebuffer.h> > +#include <drm/drm_gem_atomic_helper.h> > +#include <drm/drm_gem_shmem_helper.h> > +#include <drm/drm_gem_framebuffer_helper.h> > +#include <drm/drm_probe_helper.h> > + > +/* > + * Note on Undocumented Commands/Registers: > + * > + * Several commands and register parameters defined in this header are not > + * documented in the datasheet. Their values and usage have been derived > + * through analysis of existing userspace example programs. > + * > + * These 'unknown' definitions are crucial for the proper initialization > + * and stable operation of the panel. Modifying these values without > + * thorough understanding may lead to display anomalies, panel damage, > + * or unexpected behavior. > + */ > + > +/* Command definitions */ > +#define PIXPAPER_CMD_PANEL_SETTING 0x00 /* R00H: Panel settings */ > +#define PIXPAPER_CMD_POWER_SETTING 0x01 /* R01H: Power settings */ > +#define PIXPAPER_CMD_POWER_OFF 0x02 /* R02H: Power off */ > +#define PIXPAPER_CMD_POWER_OFF_SEQUENCE 0x03 /* R03H: Power off sequence */ > +#define PIXPAPER_CMD_POWER_ON 0x04 /* R04H: Power on */ > +#define PIXPAPER_CMD_BOOSTER_SOFT_START 0x06 /* R06H: Booster soft start */ > +#define PIXPAPER_CMD_DEEP_SLEEP 0x07 /* R07H: Deep sleep */ > +#define PIXPAPER_CMD_DATA_START_TRANSMISSION 0x10 > +/* R10H: Data transmission start */ > +#define PIXPAPER_CMD_DISPLAY_REFRESH 0x12 /* R12H: Display refresh */ > +#define PIXPAPER_CMD_PLL_CONTROL 0x30 /* R30H: PLL control */ > +#define PIXPAPER_CMD_TEMP_SENSOR_CALIB 0x41 > +/* R41H: Temperature sensor calibration */ > +#define PIXPAPER_CMD_UNKNOWN_4D 0x4D /* R4DH: Unknown command */ > +#define PIXPAPER_CMD_VCOM_INTERVAL 0x50 /* R50H: VCOM interval */ > +#define PIXPAPER_CMD_UNKNOWN_60 0x60 /* R60H: Unknown command */ > +#define PIXPAPER_CMD_RESOLUTION_SETTING 0x61 /* R61H: Resolution settings */ > +#define PIXPAPER_CMD_GATE_SOURCE_START 0x65 /* R65H: Gate/source start */ > +#define PIXPAPER_CMD_UNKNOWN_B4 0xB4 /* RB4H: Unknown command */ > +#define PIXPAPER_CMD_UNKNOWN_B5 0xB5 /* RB5H: Unknown command */ > +#define PIXPAPER_CMD_UNKNOWN_E0 0xE0 /* RE0H: Unknown command */ > +#define PIXPAPER_CMD_POWER_SAVING 0xE3 /* RE3H: Power saving */ > +#define PIXPAPER_CMD_UNKNOWN_E7 0xE7 /* RE7H: Unknown command */ > +#define PIXPAPER_CMD_UNKNOWN_E9 0xE9 /* RE9H: Unknown command */ > + > +/* R00H PSR - First Parameter */ > +#define PIXPAPER_PSR_RST_N BIT(0) > +/* Bit 0: RST_N, 1=no effect (default), 0=reset with booster OFF */ > +#define PIXPAPER_PSR_SHD_N BIT(1) > +/* Bit 1: SHD_N, 1=booster ON (default), 0=booster OFF */ > +#define PIXPAPER_PSR_SHL BIT(2) > +/* Bit 2: SHL, 1=shift right (default), 0=shift left */ > +#define PIXPAPER_PSR_UD BIT(3) > +/* Bit 3: UD, 1=scan up (default), 0=scan down */ > +#define PIXPAPER_PSR_PST_MODE BIT(5) > +/* Bit 5: PST_MODE, 0=frame scanning (default), 1=external */ > +#define PIXPAPER_PSR_RES_MASK (3 << 6) > +/* Bits 7-6: RES[1:0], resolution setting */ > +#define PIXPAPER_PSR_RES_176x296 (0x0 << 6) /* 00: 176x296 */ > +#define PIXPAPER_PSR_RES_128x296 (0x1 << 6) /* 01: 128x296 */ > +#define PIXPAPER_PSR_RES_128x250 (0x2 << 6) /* 10: 128x250 */ > +#define PIXPAPER_PSR_RES_112x204 (0x3 << 6) /* 11: 112x204 */ > +#define PIXPAPER_PSR_CONFIG \ > + (PIXPAPER_PSR_RST_N | PIXPAPER_PSR_SHD_N | PIXPAPER_PSR_SHL | \ > + PIXPAPER_PSR_UD) > +/* 0x0F: Default settings, resolution set by R61H */ > + > +/* R00H PSR - Second Parameter */ > +#define PIXPAPER_PSR2_VC_LUTZ \ > + (1 << 0) /* Bit 0: VC_LUTZ, 1=VCOM float after refresh (default), 0=no effect */ > +#define PIXPAPER_PSR2_NORG \ > + (1 << 1) /* Bit 1: NORG, 1=VCOM to GND before power off, 0=no effect (default) */ > +#define PIXPAPER_PSR2_TIEG \ > + (1 << 2) /* Bit 2: TIEG, 1=VGN to GND on power off, 0=no effect (default) */ > +#define PIXPAPER_PSR2_TS_AUTO \ > + (1 << 3) /* Bit 3: TS_AUTO, 1=sensor on RST_N low to high (default), 0=on booster */ > +#define PIXPAPER_PSR2_VCMZ \ > + (1 << 4) /* Bit 4: VCMZ, 1=VCOM always floating, 0=no effect (default) */ > +#define PIXPAPER_PSR2_FOPT \ > + (1 << 5) /* Bit 5: FOPT, 0=scan 1 frame (default), 1=no scan, HiZ */ > +#define PIXPAPER_PSR_CONFIG2 \ > + (PIXPAPER_PSR2_VC_LUTZ | \ > + PIXPAPER_PSR2_TS_AUTO) /* 0x09: Default VCOM and temp sensor settings */ > + > +/* R01H PWR - Power Setting Register */ > +/* First Parameter */ > +#define PIXPAPER_PWR_VDG_EN \ > + (1 << 0) /* Bit 0: VDG_EN, 1=internal DCDC for VGP/VGN (default), 0=external */ > +#define PIXPAPER_PWR_VDS_EN \ > + (1 << 1) /* Bit 1: VDS_EN, 1=internal regulator for VSP/VSN (default), 0=external */ > +#define PIXPAPER_PWR_VSC_EN \ > + (1 << 2) /* Bit 2: VSC_EN, 1=internal regulator for VSPL (default), 0=external */ > +#define PIXPAPER_PWR_V_MODE \ > + (1 << 3) /* Bit 3: V_MODE, 0=Mode0 (default), 1=Mode1 */ > +#define PIXPAPER_PWR_CONFIG1 \ > + (PIXPAPER_PWR_VDG_EN | PIXPAPER_PWR_VDS_EN | \ > + PIXPAPER_PWR_VSC_EN) /* 0x07: Internal power for VGP/VGN, VSP/VSN, VSPL */ > + > +/* Second Parameter */ > +#define PIXPAPER_PWR_VGPN_MASK \ > + (3 << 0) /* Bits 1-0: VGPN, VGP/VGN voltage levels */ > +#define PIXPAPER_PWR_VGPN_20V (0x0 << 0) /* 00: VGP=20V, VGN=-20V (default) */ > +#define PIXPAPER_PWR_VGPN_17V (0x1 << 0) /* 01: VGP=17V, VGN=-17V */ > +#define PIXPAPER_PWR_VGPN_15V (0x2 << 0) /* 10: VGP=15V, VGN=-15V */ > +#define PIXPAPER_PWR_VGPN_10V (0x3 << 0) /* 11: VGP=10V, VGN=-10V */ > +#define PIXPAPER_PWR_CONFIG2 PIXPAPER_PWR_VGPN_20V /* 0x00: VGP=20V, VGN=-20V */ > + > +/* Third, Fourth, Sixth Parameters (VSP_1, VSPL_0, VSPL_1) */ > +#define PIXPAPER_PWR_VSP_8_2V 0x22 /* VSP_1/VSPL_1: 8.2V (34 decimal) */ > +#define PIXPAPER_PWR_VSPL_15V 0x78 /* VSPL_0: 15V (120 decimal) */ > + > +/* Fifth Parameter (VSN_1) */ > +#define PIXPAPER_PWR_VSN_4V 0x0A /* VSN_1: -4V (10 decimal) */ > + > +/* R03H PFS - Power Off Sequence Setting Register */ > +/* First Parameter */ > +#define PIXPAPER_PFS_T_VDS_OFF_MASK \ > + (3 << 0) /* Bits 1-0: T_VDS_OFF, VSP/VSN power-off sequence */ > +#define PIXPAPER_PFS_T_VDS_OFF_20MS (0x0 << 0) /* 00: 20 ms (default) */ > +#define PIXPAPER_PFS_T_VDS_OFF_40MS (0x1 << 0) /* 01: 40 ms */ > +#define PIXPAPER_PFS_T_VDS_OFF_60MS (0x2 << 0) /* 10: 60 ms */ > +#define PIXPAPER_PFS_T_VDS_OFF_80MS (0x3 << 0) /* 11: 80 ms */ > +#define PIXPAPER_PFS_T_VDPG_OFF_MASK \ > + (3 << 4) /* Bits 5-4: T_VDPG_OFF, VGP/VGN power-off sequence */ > +#define PIXPAPER_PFS_T_VDPG_OFF_20MS (0x0 << 4) /* 00: 20 ms (default) */ > +#define PIXPAPER_PFS_T_VDPG_OFF_40MS (0x1 << 4) /* 01: 40 ms */ > +#define PIXPAPER_PFS_T_VDPG_OFF_60MS (0x2 << 4) /* 10: 60 ms */ > +#define PIXPAPER_PFS_T_VDPG_OFF_80MS (0x3 << 4) /* 11: 80 ms */ > +#define PIXPAPER_PFS_CONFIG1 \ > + (PIXPAPER_PFS_T_VDS_OFF_20MS | \ > + PIXPAPER_PFS_T_VDPG_OFF_20MS) /* 0x10: Default 20 ms for VSP/VSN and VGP/VGN */ > + > +/* Second Parameter */ > +#define PIXPAPER_PFS_VGP_EXT_MASK \ > + (0xF << 0) /* Bits 3-0: VGP_EXT, VGP extension time */ > +#define PIXPAPER_PFS_VGP_EXT_0MS (0x0 << 0) /* 0000: 0 ms */ > +#define PIXPAPER_PFS_VGP_EXT_500MS (0x1 << 0) /* 0001: 500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_1000MS (0x2 << 0) /* 0010: 1000 ms */ > +#define PIXPAPER_PFS_VGP_EXT_1500MS (0x3 << 0) /* 0011: 1500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */ > +#define PIXPAPER_PFS_VGP_EXT_2500MS (0x5 << 0) /* 0101: 2500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_3000MS (0x6 << 0) /* 0110: 3000 ms */ > +#define PIXPAPER_PFS_VGP_EXT_3500MS (0x7 << 0) /* 0111: 3500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_4000MS (0x8 << 0) /* 1000: 4000 ms */ > +#define PIXPAPER_PFS_VGP_EXT_4500MS (0x9 << 0) /* 1001: 4500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_5000MS (0xA << 0) /* 1010: 5000 ms */ > +#define PIXPAPER_PFS_VGP_EXT_5500MS (0xB << 0) /* 1011: 5500 ms */ > +#define PIXPAPER_PFS_VGP_EXT_6000MS (0xC << 0) /* 1100: 6000 ms */ > +#define PIXPAPER_PFS_VGP_EXT_6500MS (0xD << 0) /* 1101: 6500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_MASK \ > + (0xF << 4) /* Bits 7-4: VGP_LEN, VGP at 10V during power-off */ > +#define PIXPAPER_PFS_VGP_LEN_0MS (0x0 << 4) /* 0000: 0 ms */ > +#define PIXPAPER_PFS_VGP_LEN_500MS (0x1 << 4) /* 0001: 500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_1000MS (0x2 << 4) /* 0010: 1000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_1500MS (0x3 << 4) /* 0011: 1500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_2000MS (0x4 << 4) /* 0100: 2000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_2500MS (0x5 << 4) /* 0101: 2500 ms (default) */ > +#define PIXPAPER_PFS_VGP_LEN_3000MS (0x6 << 4) /* 0110: 3000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_3500MS (0x7 << 4) /* 0111: 3500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_4000MS (0x8 << 4) /* 1000: 4000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_4500MS (0x9 << 4) /* 1001: 4500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_5000MS (0xA << 4) /* 1010: 5000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_5500MS (0xB << 4) /* 1011: 5500 ms */ > +#define PIXPAPER_PFS_VGP_LEN_6000MS (0xC << 4) /* 1100: 6000 ms */ > +#define PIXPAPER_PFS_VGP_LEN_6500MS (0xD << 4) /* 1101: 6500 ms */ > +#define PIXPAPER_PFS_CONFIG2 \ > + (PIXPAPER_PFS_VGP_EXT_1000MS | \ > + PIXPAPER_PFS_VGP_LEN_2500MS) /* 0x54: VGP extension 1000 ms, VGP at 10V for 2500 ms */ > + > +/* Third Parameter */ > +#define PIXPAPER_PFS_XON_LEN_MASK \ > + (0xF << 0) /* Bits 3-0: XON_LEN, XON enable time */ > +#define PIXPAPER_PFS_XON_LEN_0MS (0x0 << 0) /* 0000: 0 ms */ > +#define PIXPAPER_PFS_XON_LEN_500MS (0x1 << 0) /* 0001: 500 ms */ > +#define PIXPAPER_PFS_XON_LEN_1000MS (0x2 << 0) /* 0010: 1000 ms */ > +#define PIXPAPER_PFS_XON_LEN_1500MS (0x3 << 0) /* 0011: 1500 ms */ > +#define PIXPAPER_PFS_XON_LEN_2000MS (0x4 << 0) /* 0100: 2000 ms (default) */ > +#define PIXPAPER_PFS_XON_LEN_2500MS (0x5 << 0) /* 0101: 2500 ms */ > +#define PIXPAPER_PFS_XON_LEN_3000MS (0x6 << 0) /* 0110: 3000 ms */ > +#define PIXPAPER_PFS_XON_LEN_3500MS (0x7 << 0) /* 0111: 3500 ms */ > +#define PIXPAPER_PFS_XON_LEN_4000MS (0x8 << 0) /* 1000: 4000 ms */ > +#define PIXPAPER_PFS_XON_LEN_4500MS (0x9 << 0) /* 1001: 4500 ms */ > +#define PIXPAPER_PFS_XON_LEN_5000MS (0xA << 0) /* 1010: 5000 ms */ > +#define PIXPAPER_PFS_XON_LEN_5500MS (0xB << 0) /* 1011: 5500 ms */ > +#define PIXPAPER_PFS_XON_LEN_6000MS (0xC << 0) /* 1100: 6000 ms */ > +#define PIXPAPER_PFS_XON_DLY_MASK \ > + (0xF << 4) /* Bits 7-4: XON_DLY, XON delay time */ > +#define PIXPAPER_PFS_XON_DLY_0MS (0x0 << 4) /* 0000: 0 ms */ > +#define PIXPAPER_PFS_XON_DLY_500MS (0x1 << 4) /* 0001: 500 ms */ > +#define PIXPAPER_PFS_XON_DLY_1000MS (0x2 << 4) /* 0010: 1000 ms */ > +#define PIXPAPER_PFS_XON_DLY_1500MS (0x3 << 4) /* 0011: 1500 ms */ > +#define PIXPAPER_PFS_XON_DLY_2000MS (0x4 << 4) /* 0100: 2000 ms (default) */ > +#define PIXPAPER_PFS_XON_DLY_2500MS (0x5 << 4) /* 0101: 2500 ms */ > +#define PIXPAPER_PFS_XON_DLY_3000MS (0x6 << 4) /* 0110: 3000 ms */ > +#define PIXPAPER_PFS_XON_DLY_3500MS (0x7 << 4) /* 0111: 3500 ms */ > +#define PIXPAPER_PFS_XON_DLY_4000MS (0x8 << 4) /* 1000: 4000 ms */ > +#define PIXPAPER_PFS_XON_DLY_4500MS (0x9 << 4) /* 1001: 4500 ms */ > +#define PIXPAPER_PFS_XON_DLY_5000MS (0xA << 4) /* 1010: 5000 ms */ > +#define PIXPAPER_PFS_XON_DLY_5500MS (0xB << 4) /* 1011: 5500 ms */ > +#define PIXPAPER_PFS_XON_DLY_6000MS (0xC << 4) /* 1100: 6000 ms */ > +#define PIXPAPER_PFS_CONFIG3 \ > + (PIXPAPER_PFS_XON_LEN_2000MS | \ > + PIXPAPER_PFS_XON_DLY_2000MS) /* 0x44: XON enable and delay at 2000 ms */ > + > +/* R06H BTST - Booster Soft Start Command */ > +/* First Parameter */ > +#define PIXPAPER_BTST_PHA_SFT_MASK \ > + (3 << 0) /* Bits 1-0: PHA_SFT, soft start period for phase A */ > +#define PIXPAPER_BTST_PHA_SFT_10MS (0x0 << 0) /* 00: 10 ms (default) */ > +#define PIXPAPER_BTST_PHA_SFT_20MS (0x1 << 0) /* 01: 20 ms */ > +#define PIXPAPER_BTST_PHA_SFT_30MS (0x2 << 0) /* 10: 30 ms */ > +#define PIXPAPER_BTST_PHA_SFT_40MS (0x3 << 0) /* 11: 40 ms */ > +#define PIXPAPER_BTST_PHB_SFT_MASK \ > + (3 << 2) /* Bits 3-2: PHB_SFT, soft start period for phase B */ > +#define PIXPAPER_BTST_PHB_SFT_10MS (0x0 << 2) /* 00: 10 ms (default) */ > +#define PIXPAPER_BTST_PHB_SFT_20MS (0x1 << 2) /* 01: 20 ms */ > +#define PIXPAPER_BTST_PHB_SFT_30MS (0x2 << 2) /* 10: 30 ms */ > +#define PIXPAPER_BTST_PHB_SFT_40MS (0x3 << 2) /* 11: 40 ms */ > +#define PIXPAPER_BTST_CONFIG1 \ > + (PIXPAPER_BTST_PHA_SFT_40MS | \ > + PIXPAPER_BTST_PHB_SFT_40MS) /* 0x0F: 40 ms for phase A and B */ > + > +/* Second to Seventh Parameters (Driving Strength or Minimum OFF Time) */ > +#define PIXPAPER_BTST_CONFIG2 0x0A /* Strength11 */ > +#define PIXPAPER_BTST_CONFIG3 0x2F /* Period48 */ > +#define PIXPAPER_BTST_CONFIG4 0x25 /* Strength38 */ > +#define PIXPAPER_BTST_CONFIG5 0x22 /* Period35 */ > +#define PIXPAPER_BTST_CONFIG6 0x2E /* Strength47 */ > +#define PIXPAPER_BTST_CONFIG7 0x21 /* Period34 */ > + > +/* R12H: DRF (Display Refresh) */ > +#define PIXPAPER_DRF_VCOM_AC 0x00 /* AC VCOM: VCOM follows LUTC (default) */ > +#define PIXPAPER_DRF_VCOM_DC 0x01 /* DC VCOM: VCOM fixed to VCOMDC */ > + > +/* R30H PLL - PLL Control Register */ > +/* First Parameter */ > +#define PIXPAPER_PLL_FR_MASK (0x7 << 0) /* Bits 2-0: FR, frame rate */ > +#define PIXPAPER_PLL_FR_12_5HZ (0x0 << 0) /* 000: 12.5 Hz */ > +#define PIXPAPER_PLL_FR_25HZ (0x1 << 0) /* 001: 25 Hz */ > +#define PIXPAPER_PLL_FR_50HZ (0x2 << 0) /* 010: 50 Hz (default) */ > +#define PIXPAPER_PLL_FR_65HZ (0x3 << 0) /* 011: 65 Hz */ > +#define PIXPAPER_PLL_FR_75HZ (0x4 << 0) /* 100: 75 Hz */ > +#define PIXPAPER_PLL_FR_85HZ (0x5 << 0) /* 101: 85 Hz */ > +#define PIXPAPER_PLL_FR_100HZ (0x6 << 0) /* 110: 100 Hz */ > +#define PIXPAPER_PLL_FR_120HZ (0x7 << 0) /* 111: 120 Hz */ > +#define PIXPAPER_PLL_DFR \ > + (1 << 3) /* Bit 3: Dynamic frame rate, 0=disabled (default), 1=enabled */ > +#define PIXPAPER_PLL_CONFIG \ > + (PIXPAPER_PLL_FR_50HZ) /* 0x02: 50 Hz, dynamic frame rate disabled */ > + > +/* R41H TSE - Temperature Sensor Calibration Register */ > +/* First Parameter */ > +#define PIXPAPER_TSE_TO_MASK \ > + (0xF << 0) /* Bits 3-0: TO[3:0], temperature offset */ > +#define PIXPAPER_TSE_TO_POS_0C (0x0 << 0) /* 0000: +0°C (default) */ > +#define PIXPAPER_TSE_TO_POS_0_5C (0x1 << 0) /* 0001: +0.5°C */ > +#define PIXPAPER_TSE_TO_POS_1C (0x2 << 0) /* 0010: +1°C */ > +#define PIXPAPER_TSE_TO_POS_1_5C (0x3 << 0) /* 0011: +1.5°C */ > +#define PIXPAPER_TSE_TO_POS_2C (0x4 << 0) /* 0100: +2°C */ > +#define PIXPAPER_TSE_TO_POS_2_5C (0x5 << 0) /* 0101: +2.5°C */ > +#define PIXPAPER_TSE_TO_POS_3C (0x6 << 0) /* 0110: +3°C */ > +#define PIXPAPER_TSE_TO_POS_3_5C (0x7 << 0) /* 0111: +3.5°C */ > +#define PIXPAPER_TSE_TO_NEG_4C (0x8 << 0) /* 1000: -4°C */ > +#define PIXPAPER_TSE_TO_NEG_3_5C (0x9 << 0) /* 1001: -3.5°C */ > +#define PIXPAPER_TSE_TO_NEG_3C (0xA << 0) /* 1010: -3°C */ > +#define PIXPAPER_TSE_TO_NEG_2_5C (0xB << 0) /* 1011: -2.5°C */ > +#define PIXPAPER_TSE_TO_NEG_2C (0xC << 0) /* 1100: -2°C */ > +#define PIXPAPER_TSE_TO_NEG_1_5C (0xD << 0) /* 1101: -1.5°C */ > +#define PIXPAPER_TSE_TO_NEG_1C (0xE << 0) /* 1110: -1°C */ > +#define PIXPAPER_TSE_TO_NEG_0_5C (0xF << 0) /* 1111: -0.5°C */ > +#define PIXPAPER_TSE_TO_FINE_MASK \ > + (0x3 << 4) /* Bits 5-4: TO[5:4], fine adjustment for positive offsets */ > +#define PIXPAPER_TSE_TO_FINE_0C (0x0 << 4) /* 00: +0.0°C (default) */ > +#define PIXPAPER_TSE_TO_FINE_0_25C (0x1 << 4) /* 01: +0.25°C */ > +#define PIXPAPER_TSE_ENABLE \ > + (0 << 7) /* Bit 7: TSE, 0=internal sensor enabled (default), 1=disabled (external) */ > +#define PIXPAPER_TSE_DISABLE \ > + (1 << 7) /* Bit 7: TSE, 1=internal sensor disabled, use external */ > +#define PIXPAPER_TSE_CONFIG \ > + (PIXPAPER_TSE_TO_POS_0C | PIXPAPER_TSE_TO_FINE_0C | \ > + PIXPAPER_TSE_ENABLE) /* 0x00: Internal sensor enabled, +0°C offset */ > + > +/* R4DH */ > +#define PIXPAPER_UNKNOWN_4D_CONFIG \ > + 0x78 /* This value is essential for initialization, derived from userspace examples. */ > + > +/* R50H CDI - VCOM and DATA Interval Setting Register */ > +/* First Parameter */ > +#define PIXPAPER_CDI_INTERVAL_MASK \ > + (0xF << 0) /* Bits 3-0: CDI[3:0], VCOM and data interval (hsync) */ > +#define PIXPAPER_CDI_17_HSYNC (0x0 << 0) /* 0000: 17 hsync */ > +#define PIXPAPER_CDI_16_HSYNC (0x1 << 0) /* 0001: 16 hsync */ > +#define PIXPAPER_CDI_15_HSYNC (0x2 << 0) /* 0010: 15 hsync */ > +#define PIXPAPER_CDI_14_HSYNC (0x3 << 0) /* 0011: 14 hsync */ > +#define PIXPAPER_CDI_13_HSYNC (0x4 << 0) /* 0100: 13 hsync */ > +#define PIXPAPER_CDI_12_HSYNC (0x5 << 0) /* 0101: 12 hsync */ > +#define PIXPAPER_CDI_11_HSYNC (0x6 << 0) /* 0110: 11 hsync */ > +#define PIXPAPER_CDI_10_HSYNC (0x7 << 0) /* 0111: 10 hsync (default) */ > +#define PIXPAPER_CDI_9_HSYNC (0x8 << 0) /* 1000: 9 hsync */ > +#define PIXPAPER_CDI_8_HSYNC (0x9 << 0) /* 1001: 8 hsync */ > +#define PIXPAPER_CDI_7_HSYNC (0xA << 0) /* 1010: 7 hsync */ > +#define PIXPAPER_CDI_6_HSYNC (0xB << 0) /* 1011: 6 hsync */ > +#define PIXPAPER_CDI_5_HSYNC (0xC << 0) /* 1100: 5 hsync */ > +#define PIXPAPER_CDI_4_HSYNC (0xD << 0) /* 1101: 4 hsync */ > +#define PIXPAPER_CDI_3_HSYNC (0xE << 0) /* 1110: 3 hsync */ > +#define PIXPAPER_CDI_2_HSYNC (0xF << 0) /* 1111: 2 hsync */ > +#define PIXPAPER_CDI_DDX \ > + (1 << 4) /* Bit 4: DDX, 0=grayscale mapping 0, 1=grayscale mapping 1 (default) */ > +#define PIXPAPER_CDI_VBD_MASK \ > + (0x7 << 5) /* Bits 7-5: VBD[2:0], border data selection */ > +#define PIXPAPER_CDI_VBD_FLOAT (0x0 << 5) /* 000: Floating (DDX=0 or 1) */ > +#define PIXPAPER_CDI_VBD_GRAY3_DDX0 \ > + (0x1 << 5) /* 001: Gray3 (border_buf=011) when DDX=0 */ > +#define PIXPAPER_CDI_VBD_GRAY2_DDX0 \ > + (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=0 */ > +#define PIXPAPER_CDI_VBD_GRAY1_DDX0 \ > + (0x3 << 5) /* 011: Gray1 (border_buf=001) when DDX=0 */ > +#define PIXPAPER_CDI_VBD_GRAY0_DDX0 \ > + (0x4 << 5) /* 100: Gray0 (border_buf=000) when DDX=0 */ > +#define PIXPAPER_CDI_VBD_GRAY0_DDX1 \ > + (0x0 << 5) /* 000: Gray0 (border_buf=000) when DDX=1 */ > +#define PIXPAPER_CDI_VBD_GRAY1_DDX1 \ > + (0x1 << 5) /* 001: Gray1 (border_buf=001) when DDX=1 */ > +#define PIXPAPER_CDI_VBD_GRAY2_DDX1 \ > + (0x2 << 5) /* 010: Gray2 (border_buf=010) when DDX=1 */ > +#define PIXPAPER_CDI_VBD_GRAY3_DDX1 \ > + (0x3 << 5) /* 011: Gray3 (border_buf=011) when DDX=1 */ > +#define PIXPAPER_CDI_VBD_FLOAT_DDX1 (0x4 << 5) /* 100: Floating when DDX=1 */ > +#define PIXPAPER_CDI_CONFIG \ > + (PIXPAPER_CDI_10_HSYNC | PIXPAPER_CDI_DDX | \ > + PIXPAPER_CDI_VBD_GRAY1_DDX1) /* 0x37: 10 hsync, DDX=1, border Gray1 */ > + > +/* R60H */ > +#define PIXPAPER_UNKNOWN_60_CONFIG1 \ > + 0x02 /* This value is essential for initialization, derived from userspace examples. */ > +#define PIXPAPER_UNKNOWN_60_CONFIG2 \ > + 0x02 /* This value is essential for initialization, derived from userspace examples. */ > + > +/* R61H TRES - Resolution Setting Register */ > +#define PIXPAPER_TRES_HRES_H \ > + ((PIXPAPER_PANEL_BUFFER_WIDTH >> 8) & \ > + 0xFF) /* HRES[9:8]: High byte of horizontal resolution (128) */ > +#define PIXPAPER_TRES_HRES_L \ > + (PIXPAPER_PANEL_BUFFER_WIDTH & \ > + 0xFF) /* HRES[7:0]: Low byte of horizontal resolution (128 = 0x80) */ > +#define PIXPAPER_TRES_VRES_H \ > + ((PIXPAPER_HEIGHT >> 8) & \ > + 0xFF) /* VRES[9:8]: High byte of vertical resolution (250) */ > +#define PIXPAPER_TRES_VRES_L \ > + (PIXPAPER_HEIGHT & \ > + 0xFF) /* VRES[7:0]: Low byte of vertical resolution (250 = 0xFA) */ > + > +/* R65H GSST - Gate/Source Start Setting Register */ > +#define PIXPAPER_GSST_S_START 0x00 /* S_Start[7:0]: First source line (S0) */ > +#define PIXPAPER_GSST_RESERVED 0x00 /* Reserved byte */ > +#define PIXPAPER_GSST_G_START_H \ > + 0x00 /* G_Start[8]: High bit of first gate line (G0) */ > +#define PIXPAPER_GSST_G_START_L \ > + 0x00 /* G_Start[7:0]: Low byte of first gate line (G0) */ > + > +/* RB4H */ > +#define PIXPAPER_UNKNOWN_B4_CONFIG \ > + 0xD0 /* This value is essential for initialization, derived from userspace examples. */ > + > +/* RB5H */ > +#define PIXPAPER_UNKNOWN_B5_CONFIG \ > + 0x03 /* This value is essential for initialization, derived from userspace examples. */ > + > +/* RE0H */ > +#define PIXPAPER_UNKNOWN_E0_CONFIG \ > + 0x00 /* This value is essential for initialization, derived from userspace examples. */ > + > +/* RE3H PWS - Power Saving Register */ > +/* First Parameter */ > +#define PIXPAPER_PWS_VCOM_W_MASK \ > + (0xF \ > + << 4) /* Bits 7-4: VCOM_W[3:0], VCOM power-saving width (line periods) */ > +#define PIXPAPER_PWS_VCOM_W_0 (0x0 << 4) /* 0000: 0 line periods */ > +#define PIXPAPER_PWS_VCOM_W_1 (0x1 << 4) /* 0001: 1 line period */ > +#define PIXPAPER_PWS_VCOM_W_2 (0x2 << 4) /* 0010: 2 line periods */ > +#define PIXPAPER_PWS_VCOM_W_3 (0x3 << 4) /* 0011: 3 line periods */ > +#define PIXPAPER_PWS_VCOM_W_4 (0x4 << 4) /* 0100: 4 line periods */ > +#define PIXPAPER_PWS_VCOM_W_5 (0x5 << 4) /* 0101: 5 line periods */ > +#define PIXPAPER_PWS_VCOM_W_6 (0x6 << 4) /* 0110: 6 line periods */ > +#define PIXPAPER_PWS_VCOM_W_7 (0x7 << 4) /* 0111: 7 line periods */ > +#define PIXPAPER_PWS_VCOM_W_8 (0x8 << 4) /* 1000: 8 line periods */ > +#define PIXPAPER_PWS_VCOM_W_9 (0x9 << 4) /* 1001: 9 line periods */ > +#define PIXPAPER_PWS_VCOM_W_10 (0xA << 4) /* 1010: 10 line periods */ > +#define PIXPAPER_PWS_VCOM_W_11 (0xB << 4) /* 1011: 11 line periods */ > +#define PIXPAPER_PWS_VCOM_W_12 (0xC << 4) /* 1100: 12 line periods */ > +#define PIXPAPER_PWS_VCOM_W_13 (0xD << 4) /* 1101: 13 line periods */ > +#define PIXPAPER_PWS_VCOM_W_14 (0xE << 4) /* 1110: 14 line periods */ > +#define PIXPAPER_PWS_VCOM_W_15 (0xF << 4) /* 1111: 15 line periods */ > +#define PIXPAPER_PWS_SD_W_MASK \ > + (0xF << 0) /* Bits 3-0: SD_W[3:0], source power-saving width (660 ns units) */ > +#define PIXPAPER_PWS_SD_W_0 (0x0 << 0) /* 0000: 0 ns */ > +#define PIXPAPER_PWS_SD_W_1 (0x1 << 0) /* 0001: 660 ns */ > +#define PIXPAPER_PWS_SD_W_2 (0x2 << 0) /* 0010: 1320 ns */ > +#define PIXPAPER_PWS_SD_W_3 (0x3 << 0) /* 0011: 1980 ns */ > +#define PIXPAPER_PWS_SD_W_4 (0x4 << 0) /* 0100: 2640 ns */ > +#define PIXPAPER_PWS_SD_W_5 (0x5 << 0) /* 0101: 3300 ns */ > +#define PIXPAPER_PWS_SD_W_6 (0x6 << 0) /* 0110: 3960 ns */ > +#define PIXPAPER_PWS_SD_W_7 (0x7 << 0) /* 0111: 4620 ns */ > +#define PIXPAPER_PWS_SD_W_8 (0x8 << 0) /* 1000: 5280 ns */ > +#define PIXPAPER_PWS_SD_W_9 (0x9 << 0) /* 1001: 5940 ns */ > +#define PIXPAPER_PWS_SD_W_10 (0xA << 0) /* 1010: 6600 ns */ > +#define PIXPAPER_PWS_SD_W_11 (0xB << 0) /* 1011: 7260 ns */ > +#define PIXPAPER_PWS_SD_W_12 (0xC << 0) /* 1100: 7920 ns */ > +#define PIXPAPER_PWS_SD_W_13 (0xD << 0) /* 1101: 8580 ns */ > +#define PIXPAPER_PWS_SD_W_14 (0xE << 0) /* 1110: 9240 ns */ > +#define PIXPAPER_PWS_SD_W_15 (0xF << 0) /* 1111: 9900 ns */ > +#define PIXPAPER_PWS_CONFIG \ > + (PIXPAPER_PWS_VCOM_W_2 | \ > + PIXPAPER_PWS_SD_W_2) /* 0x22: VCOM 2 line periods (160 µs), source 1320 ns */ > + > +/* RE7H */ > +#define PIXPAPER_UNKNOWN_E7_CONFIG \ > + 0x1C /* This value is essential for initialization, derived from userspace examples. */ > + > +/* RE9H */ > +#define PIXPAPER_UNKNOWN_E9_CONFIG \ > + 0x01 /* This value is essential for initialization, derived from userspace examples. */ > + > +MODULE_IMPORT_NS("DMA_BUF"); > + > +/* > + * The panel has a visible resolution of 122x250. > + * However, the controller requires the horizontal resolution to be aligned to 128 pixels. > + * No porch or sync timing values are provided in the datasheet, so we define minimal > + * placeholder values to satisfy the DRM framework. > + */ > + > +/* Panel visible resolution */ > +#define PIXPAPER_WIDTH 122 > +#define PIXPAPER_HEIGHT 250 > + > +/* Controller requires 128 horizontal pixels total (for memory alignment) */ > +#define PIXPAPER_HTOTAL 128 > +#define PIXPAPER_HFP 2 > +#define PIXPAPER_HSYNC 2 > +#define PIXPAPER_HBP (PIXPAPER_HTOTAL - PIXPAPER_WIDTH - PIXPAPER_HFP - PIXPAPER_HSYNC) > + > +/* > + * According to the datasheet, the total vertical blanking must be 55 lines, > + * regardless of how the vertical back porch is set. > + * Here we allocate VFP=2, VSYNC=2, and VBP=51 to sum up to 55 lines. > + * Total vertical lines = 250 (visible) + 55 (blanking) = 305. > + */ > +#define PIXPAPER_VTOTAL (250 + 55) > +#define PIXPAPER_VFP 2 > +#define PIXPAPER_VSYNC 2 > +#define PIXPAPER_VBP (55 - PIXPAPER_VFP - PIXPAPER_VSYNC) > + > +/* > + * Pixel clock calculation: > + * pixel_clock = htotal * vtotal * refresh_rate > + * = 128 * 305 * 50 > + * = 1,952,000 Hz = 1952 kHz > + */ > +#define PIXPAPER_PIXEL_CLOCK 1952 > + > +#define PIXPAPER_WIDTH_MM 24 /* approximate from 23.7046mm */ > +#define PIXPAPER_HEIGHT_MM 49 /* approximate from 48.55mm */ > + > +#define PIXPAPER_SPI_BITS_PER_WORD 8 > +#define PIXPAPER_SPI_SPEED_DEFAULT 1000000 > + > +#define PIXPAPER_PANEL_BUFFER_WIDTH 128 > +#define PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW (PIXPAPER_PANEL_BUFFER_WIDTH / 4) > + > +#define PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL 60 > +#define PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL 200 > +#define PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN 180 > + > +struct pixpaper_error_ctx { > + int errno_code; > +}; > + > +struct pixpaper_panel { > + struct drm_device drm; > + struct drm_plane plane; > + struct drm_crtc crtc; > + struct drm_encoder encoder; > + struct drm_connector connector; > + > + struct spi_device *spi; > + struct gpio_desc *reset; > + struct gpio_desc *busy; > + struct gpio_desc *dc; > +}; > + > +static inline struct pixpaper_panel *to_pixpaper_panel(struct drm_device *drm) > +{ > + return container_of(drm, struct pixpaper_panel, drm); > +} > + > +static void pixpaper_wait_for_panel(struct pixpaper_panel *panel) > +{ > + unsigned int timeout_ms = 10000; > + unsigned long timeout_jiffies = jiffies + msecs_to_jiffies(timeout_ms); > + > + usleep_range(1000, 1500); > + while (gpiod_get_value_cansleep(panel->busy) != 1) { > + if (time_after(jiffies, timeout_jiffies)) { > + drm_warn(&panel->drm, "Busy wait timed out\n"); > + return; > + } > + usleep_range(100, 200); > + } > +} > + > +static void pixpaper_spi_sync(struct spi_device *spi, struct spi_message *msg, > + struct pixpaper_error_ctx *err) > +{ > + if (err->errno_code) > + return; > + > + int ret = spi_sync(spi, msg); > + > + if (ret < 0) > + err->errno_code = ret; > +} > + > +static void pixpaper_send_cmd(struct pixpaper_panel *panel, u8 cmd, > + struct pixpaper_error_ctx *err) > +{ > + if (err->errno_code) > + return; > + > + struct spi_transfer xfer = { > + .tx_buf = &cmd, > + .len = 1, > + }; > + struct spi_message msg; > + > + spi_message_init(&msg); > + spi_message_add_tail(&xfer, &msg); > + > + gpiod_set_value_cansleep(panel->dc, 0); > + usleep_range(1, 5); > + pixpaper_spi_sync(panel->spi, &msg, err); > +} > + > +static void pixpaper_send_data(struct pixpaper_panel *panel, u8 data, > + struct pixpaper_error_ctx *err) > +{ > + if (err->errno_code) > + return; > + > + struct spi_transfer xfer = { > + .tx_buf = &data, > + .len = 1, > + }; > + struct spi_message msg; > + > + spi_message_init(&msg); > + spi_message_add_tail(&xfer, &msg); > + > + gpiod_set_value_cansleep(panel->dc, 1); > + usleep_range(1, 5); > + pixpaper_spi_sync(panel->spi, &msg, err); > +} > + > +static int pixpaper_panel_hw_init(struct pixpaper_panel *panel) > +{ > + struct pixpaper_error_ctx err = { .errno_code = 0 }; > + > + gpiod_set_value_cansleep(panel->reset, 0); > + msleep(50); > + gpiod_set_value_cansleep(panel->reset, 1); > + msleep(50); > + > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_4D_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING, &err); > + pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG, &err); > + pixpaper_send_data(panel, PIXPAPER_PSR_CONFIG2, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG1, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_CONFIG2, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_VSPL_15V, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_VSN_4V, &err); > + pixpaper_send_data(panel, PIXPAPER_PWR_VSP_8_2V, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE, &err); > + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG1, &err); > + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG2, &err); > + pixpaper_send_data(panel, PIXPAPER_PFS_CONFIG3, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG1, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG2, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG3, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG4, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG5, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG6, &err); > + pixpaper_send_data(panel, PIXPAPER_BTST_CONFIG7, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL, &err); > + pixpaper_send_data(panel, PIXPAPER_PLL_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB, &err); > + pixpaper_send_data(panel, PIXPAPER_TSE_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL, &err); > + pixpaper_send_data(panel, PIXPAPER_CDI_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_60, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG1, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_60_CONFIG2, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING, &err); > + pixpaper_send_data(panel, PIXPAPER_TRES_HRES_H, &err); > + pixpaper_send_data(panel, PIXPAPER_TRES_HRES_L, &err); > + pixpaper_send_data(panel, PIXPAPER_TRES_VRES_H, &err); > + pixpaper_send_data(panel, PIXPAPER_TRES_VRES_L, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START, &err); > + pixpaper_send_data(panel, PIXPAPER_GSST_S_START, &err); > + pixpaper_send_data(panel, PIXPAPER_GSST_RESERVED, &err); > + pixpaper_send_data(panel, PIXPAPER_GSST_G_START_H, &err); > + pixpaper_send_data(panel, PIXPAPER_GSST_G_START_L, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E7, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E7_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING, &err); > + pixpaper_send_data(panel, PIXPAPER_PWS_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E0, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E0_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B4_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_B5_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9, &err); > + pixpaper_send_data(panel, PIXPAPER_UNKNOWN_E9_CONFIG, &err); > + if (err.errno_code) > + goto init_fail; > + pixpaper_wait_for_panel(panel); > + > + return 0; > + > +init_fail: > + drm_err(&panel->drm, "Hardware initialization failed (err=%d)\n", > + err.errno_code); > + return err.errno_code; > +} > + > +/* > + * Convert framebuffer pixels to 2-bit e-paper format: > + * 00 - White > + * 01 - Black > + * 10 - Yellow > + * 11 - Red > + */ > +static u8 pack_pixels_to_byte(__le32 *src_pixels, int i, int j, > + struct drm_framebuffer *fb) > +{ > + u8 packed_byte = 0; > + int k; > + > + for (k = 0; k < 4; k++) { > + int current_pixel_x = j * 4 + k; > + u8 two_bit_val; > + > + if (current_pixel_x < PIXPAPER_WIDTH) { > + u32 pixel_offset = > + (i * (fb->pitches[0] / 4)) + current_pixel_x; > + u32 pixel = le32_to_cpu(src_pixels[pixel_offset]); > + u32 r = (pixel >> 16) & 0xFF; > + u32 g = (pixel >> 8) & 0xFF; > + u32 b = pixel & 0xFF; > + > + if (r < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL && > + g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL && > + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) { > + two_bit_val = 0b00; > + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL && > + g > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL && > + b > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL) { > + two_bit_val = 0b01; > + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL && > + g < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL && > + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) { > + two_bit_val = 0b11; > + } else if (r > PIXPAPER_COLOR_THRESHOLD_HIGH_CHANNEL && > + g > PIXPAPER_COLOR_THRESHOLD_YELLOW_MIN_GREEN && > + b < PIXPAPER_COLOR_THRESHOLD_LOW_CHANNEL) { > + two_bit_val = 0b10; > + } else { > + two_bit_val = 0b01; > + } > + } else { > + two_bit_val = 0b01; > + } > + > + packed_byte |= two_bit_val << ((3 - k) * 2); > + } > + > + return packed_byte; > +} > + > +static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane, > + struct drm_atomic_state *state) > +{ > + struct drm_plane_state *new_plane_state = > + drm_atomic_get_new_plane_state(state, plane); > + struct drm_crtc *new_crtc = new_plane_state->crtc; > + struct drm_crtc_state *new_crtc_state = NULL; > + int ret; > + > + if (new_crtc) > + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc); > + > + ret = drm_atomic_helper_check_plane_state(new_plane_state, > + new_crtc_state, DRM_PLANE_NO_SCALING, > + DRM_PLANE_NO_SCALING, false, false); > + if (ret) > + return ret; > + else if (!new_plane_state->visible) > + return 0; > + > + return 0; > +} > + > +static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc, > + struct drm_atomic_state *state) > +{ > + struct drm_crtc_state *crtc_state = > + drm_atomic_get_new_crtc_state(state, crtc); > + > + if (!crtc_state->enable) > + return 0; > + > + return drm_atomic_helper_check_crtc_primary_plane(crtc_state); > +} > + > +static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc, > + struct drm_atomic_state *state) > +{ > + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev); > + struct drm_device *drm = &panel->drm; > + int idx; > + struct pixpaper_error_ctx err = { .errno_code = 0 }; > + > + if (!drm_dev_enter(drm, &idx)) > + return; > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err); > + if (err.errno_code) { > + drm_err_once(drm, "Failed to send PON command: %d\n", > + err.errno_code); > + goto exit_drm_dev; > + } > + > + pixpaper_wait_for_panel(panel); > + > + drm_dbg(drm, "Panel enabled and powered on\n"); > + > +exit_drm_dev: > + drm_dev_exit(idx); > +} > + > +static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc, > + struct drm_atomic_state *state) > +{ > + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev); > + struct drm_device *drm = &panel->drm; > + struct pixpaper_error_ctx err = { .errno_code = 0 }; > + int idx; > + > + if (!drm_dev_enter(drm, &idx)) > + return; > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF, &err); > + if (err.errno_code) { > + drm_err_once(drm, "Failed to send POF command: %d\n", > + err.errno_code); > + goto exit_drm_dev; > + } > + pixpaper_wait_for_panel(panel); > + > + drm_dbg(drm, "Panel disabled\n"); > + > +exit_drm_dev: > + drm_dev_exit(idx); > +} > + > +static void pixpaper_plane_atomic_update(struct drm_plane *plane, > + struct drm_atomic_state *state) > +{ > + struct drm_plane_state *plane_state = > + drm_atomic_get_new_plane_state(state, plane); > + struct drm_shadow_plane_state *shadow_plane_state = > + to_drm_shadow_plane_state(plane_state); > + struct drm_crtc *crtc = plane_state->crtc; > + struct pixpaper_panel *panel = to_pixpaper_panel(crtc->dev); > + > + struct drm_device *drm = &panel->drm; > + struct drm_framebuffer *fb = plane_state->fb; > + struct iosys_map map = shadow_plane_state->data[0]; > + void *vaddr = map.vaddr; > + int i, j, idx; > + __le32 *src_pixels = NULL; > + struct pixpaper_error_ctx err = { .errno_code = 0 }; > + > + if (!drm_dev_enter(drm, &idx)) > + return; > + > + drm_dbg(drm, "Starting frame update (phys=%dx%d, buf_w=%d)\n", > + PIXPAPER_WIDTH, PIXPAPER_HEIGHT, PIXPAPER_PANEL_BUFFER_WIDTH); > + > + if (!fb || !plane_state->visible) { > + drm_err_once(drm, > + "No framebuffer or plane not visible, skipping update\n"); > + goto update_cleanup; > + } > + > + src_pixels = (__le32 *)vaddr; > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_DATA_START_TRANSMISSION, &err); > + if (err.errno_code) > + goto update_cleanup; > + > + pixpaper_wait_for_panel(panel); > + > + for (i = 0; i < PIXPAPER_HEIGHT; i++) { > + for (j = 0; j < PIXPAPER_PANEL_BUFFER_TWO_BYTES_PER_ROW; j++) { > + u8 packed_byte = > + pack_pixels_to_byte(src_pixels, i, j, fb); > + > + pixpaper_wait_for_panel(panel); > + pixpaper_send_data(panel, packed_byte, &err); > + } > + } > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON, &err); > + if (err.errno_code) { > + drm_err_once(drm, "Failed to send PON command: %d\n", > + err.errno_code); > + goto update_cleanup; > + } > + pixpaper_wait_for_panel(panel); > + > + pixpaper_send_cmd(panel, PIXPAPER_CMD_DISPLAY_REFRESH, &err); > + pixpaper_send_data(panel, PIXPAPER_DRF_VCOM_AC, &err); > + if (err.errno_code) { > + drm_err_once(drm, "Failed sending data after DRF: %d\n", > + err.errno_code); > + goto update_cleanup; > + } > + pixpaper_wait_for_panel(panel); > + > +update_cleanup: > + if (err.errno_code && err.errno_code != -ETIMEDOUT) > + drm_err_once(drm, "Frame update function failed with error %d\n", > + err.errno_code); > + > + drm_dev_exit(idx); > +} > + > +static const struct drm_display_mode pixpaper_mode = { > + .clock = PIXPAPER_PIXEL_CLOCK, > + .hdisplay = PIXPAPER_WIDTH, > + .hsync_start = PIXPAPER_WIDTH + PIXPAPER_HFP, > + .hsync_end = PIXPAPER_WIDTH + PIXPAPER_HFP + PIXPAPER_HSYNC, > + .htotal = PIXPAPER_HTOTAL, > + .vdisplay = PIXPAPER_HEIGHT, > + .vsync_start = PIXPAPER_HEIGHT + PIXPAPER_VFP, > + .vsync_end = PIXPAPER_HEIGHT + PIXPAPER_VFP + PIXPAPER_VSYNC, > + .vtotal = PIXPAPER_VTOTAL, > + .width_mm = PIXPAPER_WIDTH_MM, > + .height_mm = PIXPAPER_HEIGHT_MM, > + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, > +}; > + > +static int pixpaper_connector_get_modes(struct drm_connector *connector) > +{ > + return drm_connector_helper_get_modes_fixed(connector, &pixpaper_mode); > +} > + > +static const struct drm_plane_funcs pixpaper_plane_funcs = { > + .update_plane = drm_atomic_helper_update_plane, > + .disable_plane = drm_atomic_helper_disable_plane, > + .destroy = drm_plane_cleanup, > + DRM_GEM_SHADOW_PLANE_FUNCS, > +}; > + > +static const struct drm_plane_helper_funcs pixpaper_plane_helper_funcs = { > + DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, > + .atomic_check = pixpaper_plane_helper_atomic_check, > + .atomic_update = pixpaper_plane_atomic_update, > +}; > + > +static const struct drm_crtc_funcs pixpaper_crtc_funcs = { > + .set_config = drm_atomic_helper_set_config, > + .page_flip = drm_atomic_helper_page_flip, > + .reset = drm_atomic_helper_crtc_reset, > + .destroy = drm_crtc_cleanup, > + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, > +}; > + > +static int pixpaper_mode_valid(struct drm_crtc *crtc, > + const struct drm_display_mode *mode) > +{ > + if (mode->hdisplay == PIXPAPER_WIDTH && > + mode->vdisplay == PIXPAPER_HEIGHT) { > + return MODE_OK; > + } > + return MODE_BAD; > +} > + > +static const struct drm_crtc_helper_funcs pixpaper_crtc_helper_funcs = { > + .mode_valid = pixpaper_mode_valid, > + .atomic_check = pixpaper_crtc_helper_atomic_check, > + .atomic_enable = pixpaper_crtc_atomic_enable, > + .atomic_disable = pixpaper_crtc_atomic_disable, > +}; > + > +static const struct drm_encoder_funcs pixpaper_encoder_funcs = { > + .destroy = drm_encoder_cleanup, > +}; > + > +static const struct drm_connector_funcs pixpaper_connector_funcs = { > + .reset = drm_atomic_helper_connector_reset, > + .fill_modes = drm_helper_probe_single_connector_modes, > + .destroy = drm_connector_cleanup, > + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, > + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, > +}; > + > +static const struct drm_connector_helper_funcs pixpaper_connector_helper_funcs = { > + .get_modes = pixpaper_connector_get_modes, > +}; > + > +DEFINE_DRM_GEM_FOPS(pixpaper_fops); > + > +static struct drm_driver pixpaper_drm_driver = { > + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, > + .fops = &pixpaper_fops, > + .name = "pixpaper", > + .desc = "DRM driver for PIXPAPER e-ink", > + .major = 1, > + .minor = 0, > + DRM_GEM_SHMEM_DRIVER_OPS, > + DRM_FBDEV_SHMEM_DRIVER_OPS, > +}; > + > +static const struct drm_mode_config_funcs pixpaper_mode_config_funcs = { > + .fb_create = drm_gem_fb_create_with_dirty, > + .atomic_check = drm_atomic_helper_check, > + .atomic_commit = drm_atomic_helper_commit, > +}; > + > +static int pixpaper_probe(struct spi_device *spi) > +{ > + struct device *dev = &spi->dev; > + struct pixpaper_panel *panel; > + struct drm_device *drm; > + int ret; > + > + panel = devm_drm_dev_alloc(dev, &pixpaper_drm_driver, > + struct pixpaper_panel, drm); > + if (IS_ERR(panel)) > + return PTR_ERR(panel); > + > + drm = &panel->drm; > + panel->spi = spi; > + spi_set_drvdata(spi, panel); > + > + spi->mode = SPI_MODE_0; > + spi->bits_per_word = PIXPAPER_SPI_BITS_PER_WORD; > + > + if (!spi->max_speed_hz) { > + drm_warn(drm, > + "spi-max-frequency not specified in DT, using default %u Hz\n", > + PIXPAPER_SPI_SPEED_DEFAULT); > + spi->max_speed_hz = PIXPAPER_SPI_SPEED_DEFAULT; > + } > + > + ret = spi_setup(spi); > + if (ret < 0) { > + drm_err(drm, "SPI setup failed: %d\n", ret); > + return ret; > + } > + > + if (!dev->dma_mask) > + dev->dma_mask = &dev->coherent_dma_mask; > + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); > + if (ret) { > + drm_err(drm, "Failed to set DMA mask: %d\n", ret); > + return ret; > + } > + > + panel->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); > + if (IS_ERR(panel->reset)) > + return PTR_ERR(panel->reset); > + > + panel->busy = devm_gpiod_get(dev, "busy", GPIOD_IN); > + if (IS_ERR(panel->busy)) > + return PTR_ERR(panel->busy); > + > + panel->dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH); > + if (IS_ERR(panel->dc)) > + return PTR_ERR(panel->dc); > + > + ret = pixpaper_panel_hw_init(panel); > + if (ret) { > + drm_err(drm, "Panel hardware initialization failed: %d\n", ret); > + return ret; > + } > + > + ret = drmm_mode_config_init(drm); > + if (ret) > + return ret; > + drm->mode_config.funcs = &pixpaper_mode_config_funcs; > + drm->mode_config.min_width = PIXPAPER_WIDTH; > + drm->mode_config.max_width = PIXPAPER_WIDTH; > + drm->mode_config.min_height = PIXPAPER_HEIGHT; > + drm->mode_config.max_height = PIXPAPER_HEIGHT; > + > + ret = drm_universal_plane_init(drm, &panel->plane, 1, > + &pixpaper_plane_funcs, > + (const uint32_t[]){ DRM_FORMAT_XRGB8888 }, > + 1, NULL, DRM_PLANE_TYPE_PRIMARY, NULL); > + if (ret) > + return ret; > + drm_plane_helper_add(&panel->plane, &pixpaper_plane_helper_funcs); > + > + ret = drm_crtc_init_with_planes(drm, &panel->crtc, &panel->plane, NULL, > + &pixpaper_crtc_funcs, NULL); > + if (ret) > + return ret; > + drm_crtc_helper_add(&panel->crtc, &pixpaper_crtc_helper_funcs); > + > + ret = drm_encoder_init(drm, &panel->encoder, &pixpaper_encoder_funcs, > + DRM_MODE_ENCODER_NONE, NULL); > + if (ret) > + return ret; > + panel->encoder.possible_crtcs = drm_crtc_mask(&panel->crtc); > + > + ret = drm_connector_init(drm, &panel->connector, > + &pixpaper_connector_funcs, > + DRM_MODE_CONNECTOR_SPI); > + if (ret) > + return ret; > + > + drm_connector_helper_add(&panel->connector, > + &pixpaper_connector_helper_funcs); > + drm_connector_attach_encoder(&panel->connector, &panel->encoder); > + > + drm_mode_config_reset(drm); > + > + ret = drm_dev_register(drm, 0); > + if (ret) > + return ret; > + > + drm_client_setup(drm, NULL); > + > + return 0; > +} > + > +static void pixpaper_remove(struct spi_device *spi) > +{ > + struct pixpaper_panel *panel = spi_get_drvdata(spi); > + > + if (!panel) > + return; > + > + drm_dev_unplug(&panel->drm); > + drm_atomic_helper_shutdown(&panel->drm); > +} > + > +static const struct spi_device_id pixpaper_ids[] = { { "pixpaper", 0 }, {} }; > +MODULE_DEVICE_TABLE(spi, pixpaper_ids); > + > +static const struct of_device_id pixpaper_dt_ids[] = { > + { .compatible = "mayqueen,pixpaper" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, pixpaper_dt_ids); > + > +static struct spi_driver pixpaper_spi_driver = { > + .driver = { > + .name = "pixpaper", > + .of_match_table = pixpaper_dt_ids, > + }, > + .id_table = pixpaper_ids, > + .probe = pixpaper_probe, > + .remove = pixpaper_remove, > +}; > + > +module_spi_driver(pixpaper_spi_driver); > + > +MODULE_AUTHOR("LiangCheng Wang"); > +MODULE_DESCRIPTION("DRM SPI driver for PIXPAPER e-ink panel"); > +MODULE_LICENSE("GPL"); > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)

1 month, 1 week

Re: [PATCH net-next v2 1/6] net: ti: icssg-prueth: Add functions to create and destroy Rx/Tx queues

by Jakub Kicinski

On Mon, 1 Sep 2025 15:32:22 +0530 Meghana Malladi wrote: > if (!emac->xdpi.prog && !prog) > return 0; > > - WRITE_ONCE(emac->xdp_prog, prog); > + if (netif_running(emac->ndev)) { > + prueth_destroy_txq(emac); > + prueth_destroy_rxq(emac); > + } > + > + old_prog = xchg(&emac->xdp_prog, prog); > + if (old_prog) > + bpf_prog_put(old_prog); > + > + if (netif_running(emac->ndev)) { > + ret = prueth_create_rxq(emac); shutting the device down and freeing all rx memory for reconfig is not okay. If the system is low on memory the Rx buffer allocations may fail and system may drop off the network. You must either pre-allocate or avoid freeing the memory, and just restart the queues. > + if (ret) { > + netdev_err(emac->ndev, "Failed to create RX queue: %d\n", ret); > + return ret; > + } > + > + ret = prueth_create_txq(emac); > + if (ret) { > + netdev_err(emac->ndev, "Failed to create TX queue: %d\n", ret); > + prueth_destroy_rxq(emac); > + emac->xdp_prog = NULL; > + return ret; > + } > + } > > xdp_attachment_setup(&emac->xdpi, bpf);

1 month, 1 week

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