On 05/06/2026 14:14, David Heidelberg via B4 Relay wrote:
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 v7:
- Move logic out of switch. (Frank)
- Change csid cphy knob to phy_sel using enum. (Bryan, Frank)
- Link to v6:
https://lore.kernel.org/r/[email protected]
So I was asking you previously about a dts to support this in some way
in effect to prove it works.
I had a meeting with some qcom guys on Friday and the informed me they
have based work on top of yours, which is inference enough that it works.
Some Tested-by: from others interested in this work, would be greatly
appreciated at this stage.
---
bod
