Re: [PATCH v15 00/13] drm/msm/dpu: Support quad pipe with dual-interface

[Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>]

On Tue, Aug 19, 2025 at 09:30:54AM +0800, Jun Nie wrote:
> 2 or more SSPPs and dual-DSI interface are need for super wide panel.
> And 4 DSC are preferred for power optimal in this case due to width
> limitation of SSPP and MDP clock rate constrain. This patch set
> extends number of pipes to 4 and revise related mixer blending logic
> to support quad pipe. All these changes depends on the virtual plane
> feature to split a super wide drm plane horizontally into 2 or more sub
> clip. Thus DMA of multiple SSPPs can share the effort of fetching the
> whole drm plane.
> 
> The first pipe pair co-work with the first mixer pair to cover the left
> half of screen and 2nd pair of pipes and mixers are for the right half
> of screen. If a plane is only for the right half of screen, only one
> or two of pipes in the 2nd pipe pair are valid, and no SSPP or mixer is
> assinged for invalid pipe.
> 
> For those panel that does not require quad-pipe, only 1 or 2 pipes in
> the 1st pipe pair will be used. There is no concept of right half of
> screen.
> 
> For legacy non virtual plane mode, the first 1 or 2 pipes are used for
> the single SSPP and its multi-rect mode.
> 
> Changes in v15:
> - Polish logic in sspp check and assignment.
> - Link to v14: https://lore.kernel.org/r/20250801-v6-16-rc2-quad-pipe-upstream-v14-0-b626236f4c31@linaro.org

I tried picking up these patches into the msm-next-lumag, however they
seem to trigger a lot of IGT test failures. See [1]. Could you please
take a look at those failures? Note, virtual planes are still disabled
by default.

[1] https://gitlab.freedesktop.org/drm/msm/-/pipelines/1502582


-- 
With best wishes
Dmitry