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-b626236f4...@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
