Note: WIP tag added, as not everything from the previous review round has been addressed.
# Short summary This patch series extends the Qualcomm CAMSS (Camera Subsystem), including CSID and CSIPHY components, to support C-PHY mode configuration. # Background and motivation Modern smartphone cameras increasingly rely on MIPI C-PHY rather than D-PHY, thanks to its higher data throughput and signal efficiency. As a result, many OEMs adopt C-PHY interfaces for main (rear) cameras on Qualcomm-based devices. Until now, mainline Linux lacked C-PHY configuration support for Qualcomm chipsets, preventing bring-up of primary camera sensors on several Snapdragon platforms. This series closes that gap. - Introduces C-PHY configuration support for the CAMSS driver stack, covering both CSID and CSIPHY blocks. - Successfully enables C-PHY operation on the Snapdragon 845 platform. - Tested on OnePlus 6 and 6T phones running mainline Linux, using the Sony IMX519 main camera sensor. - The new configuration allows other chipsets versionsto enable C-PHY by simply adding corresponding sensor driver support and csiphy initialization data, following the example set for sdm845. With this patch series, mainline Linux gains working C-PHY support for Snapdragon 845, paving the way for improved main camera functionality across many Qualcomm-based devices. The groundwork also simplifies future enablement efforts for additional SoCs and sensors. Until merged, the series will be also available at: https://codeberg.org/sdm845/linux/commits/branch/b4/qcom-cphy Signed-off-by: David Heidelberg <[email protected]> --- Changes in v4: - Documented cphy parametr to camss_get_link_freq. - Use BIT() macro for lane_mask. (Bryan) - Correct lane_mask calculation. (Kieran + me) - Removed comment for the D/C-PHY sequences init. (Bryan) - Pass &csid->phy for calculate freq. (Bryan) - Added missing cphy description to camss_get_link_freq. (kernel test robot) - Gen2 v1.1 MIPI CSI-2 CPHY init hex to lowercase. - Added back missed commit with improved electrical for sdm845 3ph. - NOT addressed yet: - Proliferating special cases in switch statements on a per-SoC basis is verboten. - is it possible to set clock_lane to say 0xff in DT ? - Link to v3: https://lore.kernel.org/r/[email protected] Changes in v3: - Make lanes_enable return sucess or error, since I couldn't move the configuration to the _init. - Dropped R-b tags on "media: qcom: camss: Initialize lanes after lane configuration is available" as I changed formatting. - Link to v2: https://lore.kernel.org/r/[email protected] Changes in v2: - This is still WIP patch series, thus I wanted to publish already changed parts to get feedback regarding to the direction of patchset. - When switch to using odd bits, zeroed val which was left unitialized in v1. - Accidentally missed archs added back in the commit moving lane regs to new location. - Remove commit with reverting check for only D-PHY is supported and adjusted the check to also account for C-PHY. - Documented link frequency calculation with defines. (Casey) - Changed the cphy boolean to phy_cfg enum in the camss/camss-csiphy. (Brian) - Added patch for csiphy-3ph enablement for sm7280 from Luca as I'm meanwhile trying to bring up the C-PHY sensor on FairPhone 5. - Merged these two commits together csiphy-3ph: Enable sdm845 C-PHY sequence csiphy-3ph: Add Gen2 v1.1 MIPI CSI-2 CPHY init merged R-b. - Link to v1: https://lore.kernel.org/r/[email protected] --- Casey Connolly (1): media: qcom: camss: csiphy-3ph: Add Gen2 v1.1 MIPI CSI-2 CPHY init David Heidelberg (6): media: qcom: camss: csiphy: Introduce PHY configuration media: qcom: camss: csiphy-3ph: Use odd bits for configuring C-PHY lanes media: qcom: camss: Prepare CSID for C-PHY support media: qcom: camss: csiphy-3ph: Update Gen2 v1.1 MIPI CSI-2 CPHY init media: qcom: camss: csiphy-3ph: C-PHY needs own lane configuration media: qcom: camss: Account for C-PHY when calculating link frequency Luca Weiss (1): media: qcom: camss: csiphy-3ph: Add Gen2 v1.2.1 MIPI CSI-2 C-PHY init Petr Hodina (1): media: qcom: camss: Initialize lanes after lane configuration is available .../media/platform/qcom/camss/camss-csid-gen2.c | 1 + drivers/media/platform/qcom/camss/camss-csid.c | 12 +- drivers/media/platform/qcom/camss/camss-csid.h | 1 + .../platform/qcom/camss/camss-csiphy-2ph-1-0.c | 8 +- .../platform/qcom/camss/camss-csiphy-3ph-1-0.c | 336 ++++++++++++++++++--- drivers/media/platform/qcom/camss/camss-csiphy.c | 11 +- drivers/media/platform/qcom/camss/camss-csiphy.h | 8 +- drivers/media/platform/qcom/camss/camss.c | 36 ++- drivers/media/platform/qcom/camss/camss.h | 2 +- 9 files changed, 342 insertions(+), 73 deletions(-) --- base-commit: 3fa5e5702a82d259897bd7e209469bc06368bf31 change-id: 20251109-qcom-cphy-bb8cbda1c644 Best regards, -- David Heidelberg <[email protected]>
