Hi, On Tue, Dec 5, 2023 at 4:37 AM Pin-yen Lin <treapking@xxxxxxxxxxxx> wrote: > > These panels are used by Mediatek MT8173 Chromebooks but we can't find > the corresponding data sheets, and these panels used to work on v4.19 > kernel without any specified delays. > > Therefore, instead of having them use the default conservative timings, > update them with less-conservative timings from other panels of the same > vendor. The panels should still work under those timings, and we can > save some delays and suppress the warnings. > > Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx> > > --- > > drivers/gpu/drm/panel/panel-edp.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) This is OK w/ me, but it will need time on the mailing lists before landing in case anyone else has opinions. Specifical thoughts: * I at least feel fairly confident that this is OK since these panels essentially booted without _any_ delays back on the old downstream v4.19 kernel. Presumably the panels just had fairly robust timing controllers and so worked OK, but it's better to get the timing more correct. * This is definitely better than the very conservative timings and the WARN_ON splat. * I don't love the "Unknown" string, but it doesn't do anything other than print to dmesg anyway and at least it conveys to anyone else reading the table that the timings may not be quite as tight. -Doug
