Hi David,
On 11/9/25 10:39, David Heidelberg via B4 Relay wrote:
# Short summary
This patch series extends the Qualcomm CAMSS (Camera Subsystem),
including CSID and CSIPHY components, to support C-PHY mode configuration.
Awesome to see this actually working after so much time and prior effort!
# 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.
I think it's worth being clearer here that this is only tested on
SDM845, and will only work on sdm845 anyway because of the lane
configuration.
Additionally, with Luca's explicit D-phy check removed, other platforms
won't error out if someone tries to use c-phy without adding the lane
configuration (and whatever other configuration might also be needed),
so it might be worth adding a proper check for that.
- 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.
woohoo!
Kind regards,
Casey (she/they)
Signed-off-by: David Heidelberg <[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 C-PHY
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: Use sdm845 C-PHY configuration sequence
media: qcom: camss: Account for C-PHY when calculating link frequency
media: qcom: camss: Remove D-PHY-only endpoint restriction
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 | 3 +-
drivers/media/platform/qcom/camss/camss-csid.h | 1 +
.../platform/qcom/camss/camss-csiphy-3ph-1-0.c | 165 ++++++++++++++++-----
drivers/media/platform/qcom/camss/camss-csiphy.c | 6 +-
drivers/media/platform/qcom/camss/camss-csiphy.h | 2 +
drivers/media/platform/qcom/camss/camss.c | 24 ++-
drivers/media/platform/qcom/camss/camss.h | 2 +-
8 files changed, 146 insertions(+), 58 deletions(-)
---
base-commit: 9c0826a5d9aa4d52206dd89976858457a2a8a7ed
change-id: 20251109-qcom-cphy-bb8cbda1c644
Best regards,
