Re: [PATCH v21] drm/msm/dpu: Enable quad-pipe for DSC and dual-DSI case

[Dmitry Baryshkov]

On Mon, Jul 27, 2026 at 05:33:26PM +0800, Jun Nie wrote:
> To support high-resolution cases that exceed the width constrain
> or scenarios that surpass the maximum MDP clock rate, additional
> pipes are necessary to enable parallel data processing within
> the width constraints and MDP clock rate.
> 
> Expand pipe array size to 4. Request 4 mixers and 4 DSCs for
> high-resolution cases where dual interfaces are enabled for virtual
> plane case. More use cases can be incorporated later if quad-pipe
> capabilities are required.
> 
> Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Reviewed-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
> Patchwork: https://patchwork.freedesktop.org/patch/675418/
> Link: https://lore.kernel.org/r/20250918-v6-16-rc2-quad-pipe-upstream-4-v16-10-ff6232e3472f@xxxxxxxxxx
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
> ---

Jun, thanks for your work and your efforts. I hope you don't mind me
taking your patch, testing it thoroughly and finally polishing the LM
allocation conditions. I can say that without your energy and
persistency the series had no chance of being implemented and landed.

I've posted the (hopefully) final bits at [1]. I will run them through
the CI and if everything works, it will land in 7.4.

[1] https://patch.msgid.link/20261003-dpu-quad-pipe-fixed-v1-0-6a6a00917b71@xxxxxxxxxxxxxxxx

-- 
With best wishes
Dmitry