Linaro-mm-sig September 2025

linaro-mm-sig@lists.linaro.org

22 participants
41 discussions

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

9 months, 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

9 months, 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

9 months, 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)

9 months, 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);

9 months, 1 week

Re: [PATCH] dma-buf: system_heap: use larger contiguous mappings instead of per-page mmap

by John Stultz

On Sat, Aug 30, 2025 at 4:58 PM Barry Song <21cnbao(a)gmail.com> wrote: > > From: Barry Song <v-songbaohua(a)oppo.com> > > We can allocate high-order pages, but mapping them one by > one is inefficient. This patch changes the code to map > as large a chunk as possible. The code looks somewhat > complicated mainly because supporting mmap with a > non-zero offset is a bit tricky. > > Using the micro-benchmark below, we see that mmap becomes > 3.5X faster: ... It's been awhile since I've done mm things, so take it with a pinch of salt, but this seems reasonable to me. Though, one thought below... > diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c > index bbe7881f1360..4c782fe33fd4 100644 > --- a/drivers/dma-buf/heaps/system_heap.c > +++ b/drivers/dma-buf/heaps/system_heap.c > @@ -186,20 +186,35 @@ static int system_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) > struct system_heap_buffer *buffer = dmabuf->priv; > struct sg_table *table = &buffer->sg_table; > unsigned long addr = vma->vm_start; > - struct sg_page_iter piter; > - int ret; > + unsigned long pgoff = vma->vm_pgoff; > + struct scatterlist *sg; > + int i, ret; > + > + for_each_sgtable_sg(table, sg, i) { > + unsigned long n = sg->length >> PAGE_SHIFT; > > - for_each_sgtable_page(table, &piter, vma->vm_pgoff) { > - struct page *page = sg_page_iter_page(&piter); > + if (pgoff < n) > + break; > + pgoff -= n; > + } > + > + for (; sg && addr < vma->vm_end; sg = sg_next(sg)) { > + unsigned long n = (sg->length >> PAGE_SHIFT) - pgoff; > + struct page *page = sg_page(sg) + pgoff; > + unsigned long size = n << PAGE_SHIFT; > + > + if (addr + size > vma->vm_end) > + size = vma->vm_end - addr; > > - ret = remap_pfn_range(vma, addr, page_to_pfn(page), PAGE_SIZE, > - vma->vm_page_prot); > + ret = remap_pfn_range(vma, addr, page_to_pfn(page), > + size, vma->vm_page_prot); It feels like this sort of mapping loop for higher order pages wouldn't be a unique pattern to just this code. Would this be better worked into a helper so it would be more generally usable? Otherwise, Acked-by: John Stultz <jstultz(a)google.com> thanks -john

9 months, 1 week

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

by David Hildenbrand

>> +>> +struct cma *__init cma_create(phys_addr_t base, phys_addr_t size, >> + unsigned int order_per_bit, const char *name) >> +{ >> + struct cma *cma; >> + int ret; >> + >> + ret = cma_check_memory(base, size); >> + if (ret < 0) >> + return ERR_PTR(ret); >> + >> + cma = kzalloc(sizeof(*cma), GFP_KERNEL); >> + if (!cma) >> + return ERR_PTR(-ENOMEM); >> + >> + cma_init_area(cma, name, size, order_per_bit); >> + cma->ranges[0].base_pfn = PFN_DOWN(base); >> + cma->ranges[0].early_pfn = PFN_DOWN(base); >> + cma->ranges[0].count = cma->count; >> + cma->nranges = 1; >> + >> + cma_activate_area(cma); >> + >> + return cma; >> +} >> + >> +void cma_free(struct cma *cma) >> +{ >> + kfree(cma); >> +} >> -- >> 2.50.0 > > > 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. Yeah, I'm not a fan of that. What is the big problem we are trying to solve here? Why do they have to be dynamic, why do they even have to support freeing? -- Cheers David / dhildenb

9 months, 1 week

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

by Thierry Reding

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. Thierry

9 months, 1 week

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

by kernel test robot

Hi Amirreza, kernel test robot noticed the following build warnings: [auto build test WARNING on 33bcf93b9a6b028758105680f8b538a31bc563cf] url: https://github.com/intel-lab-lkp/linux/commits/Amirreza-Zarrabi/tee-allow-a… base: 33bcf93b9a6b028758105680f8b538a31bc563cf patch link: https://lore.kernel.org/r/20250901-qcom-tee-using-tee-ss-without-mem-obj-v9… patch subject: [PATCH v9 06/11] firmware: qcom: scm: add support for object invocation config: i386-buildonly-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509030554.WR3MNpCE-lkp@…) compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509030554.WR3MNpCE-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/202509030554.WR3MNpCE-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from include/linux/device.h:15, from include/linux/dma-mapping.h:5, from drivers/firmware/qcom/qcom_scm.c:13: drivers/firmware/qcom/qcom_scm.c: In function 'qcom_scm_qtee_init': >> drivers/firmware/qcom/qcom_scm.c:2208:35: warning: format '%d' expects argument of type 'int', but argument 3 has type 'long int' [-Wformat=] 2208 | dev_err(scm->dev, "qcomtee: register failed: %d\n", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap' 110 | _p_func(dev, fmt, ##__VA_ARGS__); \ | ^~~ include/linux/dev_printk.h:154:56: note: in expansion of macro 'dev_fmt' 154 | dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~ drivers/firmware/qcom/qcom_scm.c:2208:17: note: in expansion of macro 'dev_err' 2208 | dev_err(scm->dev, "qcomtee: register failed: %d\n", | ^~~~~~~ drivers/firmware/qcom/qcom_scm.c:2208:63: note: format string is defined here 2208 | dev_err(scm->dev, "qcomtee: register failed: %d\n", | ~^ | | | int | %ld vim +2208 drivers/firmware/qcom/qcom_scm.c 2188 2189 static void qcom_scm_qtee_init(struct qcom_scm *scm) 2190 { 2191 struct platform_device *qtee_dev; 2192 u64 result, response_type; 2193 int ret; 2194 2195 /* 2196 * Probe for smcinvoke support. This will fail due to invalid buffers, 2197 * but first, it checks whether the call is supported in QTEE syscall 2198 * handler. If it is not supported, -EIO is returned. 2199 */ 2200 ret = qcom_scm_qtee_invoke_smc(0, 0, 0, 0, &result, &response_type); 2201 if (ret == -EIO) 2202 return; 2203 2204 /* Setup QTEE interface device. */ 2205 qtee_dev = platform_device_register_data(scm->dev, "qcomtee", 2206 PLATFORM_DEVID_NONE, NULL, 0); 2207 if (IS_ERR(qtee_dev)) { > 2208 dev_err(scm->dev, "qcomtee: register failed: %d\n", 2209 PTR_ERR(qtee_dev)); 2210 return; 2211 } 2212 2213 ret = devm_add_action_or_reset(scm->dev, qcom_scm_qtee_free, qtee_dev); 2214 if (ret) 2215 dev_err(scm->dev, "qcomtee: add action failed: %d\n", ret); 2216 } 2217 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

9 months, 1 week

[PATCH v1 00/10] vfio/pci: Allow MMIO regions to be exported through dma-buf

by Leon Romanovsky

Changelog: v1: * Changed commit messages. * Reused DMA_ATTR_MMIO attribute. * Returned support for multiple DMA ranges per-dMABUF. v0: https://lore.kernel.org/all/cover.1753274085.git.leonro@nvidia.com --------------------------------------------------------------------------- Based on "[PATCH v1 00/16] dma-mapping: migrate to physical address-based API" https://lore.kernel.org/all/cover.1754292567.git.leon@kernel.org series. --------------------------------------------------------------------------- This series extends the VFIO PCI subsystem to support exporting MMIO regions from PCI device BARs as dma-buf objects, enabling safe sharing of non-struct page memory with controlled lifetime management. This allows RDMA and other subsystems to import dma-buf FDs and build them into memory regions for PCI P2P operations. The series supports a use case for SPDK where a NVMe device will be owned by SPDK through VFIO but interacting with a RDMA device. The RDMA device may directly access the NVMe CMB or directly manipulate the NVMe device's doorbell using PCI P2P. However, as a general mechanism, it can support many other scenarios with VFIO. This dmabuf approach can be usable by iommufd as well for generic and safe P2P mappings. In addition to the SPDK use-case mentioned above, the capability added in this patch series can also be useful when a buffer (located in device memory such as VRAM) needs to be shared between any two dGPU devices or instances (assuming one of them is bound to VFIO PCI) as long as they are P2P DMA compatible. The implementation provides a revocable attachment mechanism using dma-buf move operations. MMIO regions are normally pinned as BARs don't change physical addresses, but access is revoked when the VFIO device is closed or a PCI reset is issued. This ensures kernel self-defense against potentially hostile userspace. The series includes significant refactoring of the PCI P2PDMA subsystem to separate core P2P functionality from memory allocation features, making it more modular and suitable for VFIO use cases that don't need struct page support. ----------------------------------------------------------------------- The series is based originally on https://lore.kernel.org/all/20250307052248.405803-1-vivek.kasireddy@intel.c… but heavily rewritten to be based on DMA physical API. ----------------------------------------------------------------------- The WIP branch can be found here: https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git/log/?h=… Thanks Leon Romanovsky (8): PCI/P2PDMA: Remove redundant bus_offset from map state PCI/P2PDMA: Separate the mmap() support from the core logic PCI/P2PDMA: Simplify bus address mapping API PCI/P2PDMA: Refactor to separate core P2P functionality from memory allocation PCI/P2PDMA: Export pci_p2pdma_map_type() function types: move phys_vec definition to common header vfio/pci: Enable peer-to-peer DMA transactions by default vfio/pci: Add dma-buf export support for MMIO regions Vivek Kasireddy (2): vfio: Export vfio device get and put registration helpers vfio/pci: Share the core device pointer while invoking feature functions block/blk-mq-dma.c | 7 +- drivers/iommu/dma-iommu.c | 4 +- drivers/pci/p2pdma.c | 154 ++++++++---- drivers/vfio/pci/Kconfig | 20 ++ drivers/vfio/pci/Makefile | 2 + drivers/vfio/pci/vfio_pci_config.c | 22 +- drivers/vfio/pci/vfio_pci_core.c | 59 +++-- drivers/vfio/pci/vfio_pci_dmabuf.c | 390 +++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci_priv.h | 23 ++ drivers/vfio/vfio_main.c | 2 + include/linux/dma-buf.h | 1 + include/linux/pci-p2pdma.h | 114 +++++---- include/linux/types.h | 5 + include/linux/vfio.h | 2 + include/linux/vfio_pci_core.h | 4 + include/uapi/linux/vfio.h | 25 ++ kernel/dma/direct.c | 4 +- mm/hmm.c | 2 +- 18 files changed, 715 insertions(+), 125 deletions(-) create mode 100644 drivers/vfio/pci/vfio_pci_dmabuf.c -- 2.50.1

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Linaro-mm-sig September 2025