Hi,
The first four patches in this series are miscellaneous fixes and improvements in the Cadence and TI CSI-RX drivers around probing, fwnode and link creation.
The last two patches add support for transmitting multiple pixels per clock on the internal bus between Cadence CSI-RX bridge and TI CSI-RX wrapper. As this internal bus is 32-bit wide, the maximum number of pixels that can be transmitted per cycle depend upon the format's bit width. Secondly, the downstream element must support unpacking of multiple pixels.
Thus we export a module function that can be used by the downstream driver to negotiate the pixels per cycle on the output pixel stream of the Cadence bridge.
Signed-off-by: Jai Luthra jai.luthra@ideasonboard.com --- Changes in v2: - Rebase on v6.15-rc1 - Fix lkp warnings in PATCH 5/6 missing header for FIELD_PREP - Add R-By tags from Devarsh and Changhuang - Link to v1: https://lore.kernel.org/r/20250324-probe_fixes-v1-0-5cd5b9e1cfac@ideasonboar...
--- Jai Luthra (6): media: ti: j721e-csi2rx: Use devm_of_platform_populate media: ti: j721e-csi2rx: Use fwnode_get_named_child_node media: ti: j721e-csi2rx: Fix source subdev link creation media: cadence: csi2rx: Implement get_fwnode_pad op media: cadence: cdns-csi2rx: Support multiple pixels per clock cycle media: ti: j721e-csi2rx: Support multiple pixels per clock
drivers/media/platform/cadence/cdns-csi2rx.c | 76 +++++++++++++++++----- drivers/media/platform/cadence/cdns-csi2rx.h | 19 ++++++ drivers/media/platform/ti/Kconfig | 3 +- .../media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 66 ++++++++++++++----- 4 files changed, 129 insertions(+), 35 deletions(-) --- base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8 change-id: 20250314-probe_fixes-7e0ec33c7fee
Best regards,
Ensure that we clean up the platform bus when we remove this driver.
This fixes a crash seen when reloading the module for the child device with the parent not yet reloaded.
Fixes: b4a3d877dc92 ("media: ti: Add CSI2RX support for J721E") Cc: stable@vger.kernel.org Reviewed-by: Devarsh Thakkar devarsht@ti.com Signed-off-by: Jai Luthra jai.luthra@ideasonboard.com --- drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c index 6412a00be8eab89548950dd21b3b3ec02dafa5b4..a066024bf745450e2ba01d06c0fec4e6bdbfa97e 100644 --- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c +++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c @@ -1118,7 +1118,7 @@ static int ti_csi2rx_probe(struct platform_device *pdev) if (ret) goto err_vb2q;
- ret = of_platform_populate(csi->dev->of_node, NULL, NULL, csi->dev); + ret = devm_of_platform_populate(csi->dev); if (ret) { dev_err(csi->dev, "Failed to create children: %d\n", ret); goto err_subdev;
We don't use OF ports and remote-endpoints to connect the CSI2RX bridge and this device in the device tree, thus it is wrong to use v4l2_create_fwnode_links_to_pad() to create the media graph link between the two.
It works out on accident, as neither the source nor the sink implement the .get_fwnode_pad() callback, and the framework helper falls back on using the first source and sink pads to create the link between them.
Instead, manually create the media link from the first source pad of the bridge to the first sink pad of the J721E CSI2RX.
Fixes: b4a3d877dc92 ("media: ti: Add CSI2RX support for J721E") Cc: stable@vger.kernel.org Reviewed-by: Devarsh Thakkar devarsht@ti.com Signed-off-by: Jai Luthra jai.luthra@ideasonboard.com --- drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c index 6d406925e092660cb67c04cc2a7e1e10c14e295e..ad51d033b6725426550578bdac1bae8443458f13 100644 --- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c +++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c @@ -53,6 +53,8 @@ #define DRAIN_TIMEOUT_MS 50 #define DRAIN_BUFFER_SIZE SZ_32K
+#define CSI2RX_BRIDGE_SOURCE_PAD 1 + struct ti_csi2rx_fmt { u32 fourcc; /* Four character code. */ u32 code; /* Mbus code. */ @@ -427,8 +429,9 @@ static int csi_async_notifier_complete(struct v4l2_async_notifier *notifier) if (ret) return ret;
- ret = v4l2_create_fwnode_links_to_pad(csi->source, &csi->pad, - MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED); + ret = media_create_pad_link(&csi->source->entity, CSI2RX_BRIDGE_SOURCE_PAD, + &vdev->entity, csi->pad.index, + MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED);
if (ret) { video_unregister_device(vdev);
Hi Jai, Thanks for the patch series.
On 10/04/25 12:18, Jai Luthra wrote:
Hi,
The first four patches in this series are miscellaneous fixes and improvements in the Cadence and TI CSI-RX drivers around probing, fwnode and link creation.
The last two patches add support for transmitting multiple pixels per clock on the internal bus between Cadence CSI-RX bridge and TI CSI-RX wrapper. As this internal bus is 32-bit wide, the maximum number of pixels that can be transmitted per cycle depend upon the format's bit width. Secondly, the downstream element must support unpacking of multiple pixels.
Thus we export a module function that can be used by the downstream driver to negotiate the pixels per cycle on the output pixel stream of the Cadence bridge.
Signed-off-by: Jai Luthra jai.luthra@ideasonboard.com
For the entire series,
Tested-by: Yemike Abhilash Chandra y-abhilashchandra@ti.com [on AM68SK]
Changes in v2:
- Rebase on v6.15-rc1
- Fix lkp warnings in PATCH 5/6 missing header for FIELD_PREP
- Add R-By tags from Devarsh and Changhuang
- Link to v1: https://lore.kernel.org/r/20250324-probe_fixes-v1-0-5cd5b9e1cfac@ideasonboar...
Jai Luthra (6): media: ti: j721e-csi2rx: Use devm_of_platform_populate media: ti: j721e-csi2rx: Use fwnode_get_named_child_node media: ti: j721e-csi2rx: Fix source subdev link creation media: cadence: csi2rx: Implement get_fwnode_pad op media: cadence: cdns-csi2rx: Support multiple pixels per clock cycle media: ti: j721e-csi2rx: Support multiple pixels per clock
drivers/media/platform/cadence/cdns-csi2rx.c | 76 +++++++++++++++++----- drivers/media/platform/cadence/cdns-csi2rx.h | 19 ++++++ drivers/media/platform/ti/Kconfig | 3 +- .../media/platform/ti/j721e-csi2rx/j721e-csi2rx.c | 66 ++++++++++++++----- 4 files changed, 129 insertions(+), 35 deletions(-)
base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8 change-id: 20250314-probe_fixes-7e0ec33c7fee
Best regards,
linux-stable-mirror@lists.linaro.org
-
Jai Luthra -
Yemike Abhilash Chandra