This set of patches corrects and improves VSync-related register setup on the MDP5 block. Values written to the registers were way too high leading to the MDSS block counting way too many ticks on the vclk before emitting a vsync interrupt, resulting in significant update issues on command- and video-mode panels. With lower values - that match those of downstream kernels - the panels on Sony devices (Xperia X, XA2 Ultra, and more) update at an acceptable rate without "pp_done" timeouts.
The Driver-IC in these panels is also able to drive an interrupt line and a future patchset will enable the use of this "disp-te" GPIO beyond acquiring it in dsi_host. This fixes panel framerate the correct way (instead of running at half the desired framerate), but these patches are still needed to aid development now and shorten lockup times when the TE interrupt misbehaves by not arriving at all.
AngeloGioacchino Del Regno (1): drm/msm/mdp5: Disable pingpong autorefresh at tearcheck init
Marijn Suijten (2): drm/msm/mdp5: Configure PP_SYNC_HEIGHT to double the vtotal drm/msm/mdp5: Do not multiply vclk line count by 100
drivers/gpu/drm/msm/disp/mdp5/mdp5_cmd_encoder.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)