Re: [PATCH 10/13] drm/msm/dp: Signal BT.2020 RGB on DP and eDP

[Dmitry Baryshkov]

On Wed, Sep 30, 2026 at 08:41:54PM +0800, Xilin Wu wrote:
> Expose the DP Colorspace property and carry VSC packets in bridge atomic
> state. Validate VSC support against cached sink capabilities and check it
> again after powering up the sink. Regenerate the packet if link training
> changes the SDR bit depth.

This doesn't sound nice either. Do you know how it gets handled by i915?

> Signal full-range RGB, matching the existing pixel path, and retain CTA
> range for YUV420. Reject BT2020_RGB with a YUV420-only mode. Clear stale
> MSA colorimetry bits and include VSC removal in peripheral flush requests.

This sounds like too many features for a single commit, sorry.

> 
> Force a modeset when colorspace changes. Disable PSR in the controller and
> sink while colorimetry VSC packets are active, since they cannot share the
> automatic PSR packet generator. Restore PSR configuration when returning
> to a stream that does not need colorimetry VSC packets.
> 
> Assisted-by: LLM
> Signed-off-by: Xilin Wu <sophon@xxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/dp/dp_ctrl.c    | 33 ++++++++++++++++------
>  drivers/gpu/drm/msm/dp/dp_ctrl.h    |  2 +-
>  drivers/gpu/drm/msm/dp/dp_display.c | 26 +++++++++++++++--
>  drivers/gpu/drm/msm/dp/dp_drm.c     | 13 +++++++--
>  drivers/gpu/drm/msm/dp/dp_drm.h     |  3 ++
>  drivers/gpu/drm/msm/dp/dp_panel.c   | 56 +++++--------------------------------
>  drivers/gpu/drm/msm/dp/dp_panel.h   |  4 +++
>  drivers/gpu/drm/msm/dp/dp_utils.c   | 38 +++++++++++++++++++++++++
>  drivers/gpu/drm/msm/dp/dp_utils.h   |  7 +++++
>  9 files changed, 118 insertions(+), 64 deletions(-)
> 

-- 
With best wishes
Dmitry