On 2023-04-03 at 15:52:36 +0200, "Roman Beranek" <me@xxxxxxx> wrote: > On Sun Apr 2, 2023 at 12:49 PM CEST, Frank Oltmanns wrote: >> >> When apply this to drm-next my panel stays dark. I haven't figured out >> yet why, though. The other two patches in this series work fine, i.e. >> they have no effect as they are just a refactoring. >> >> I'm testing this on my pinephone. It's the same with the patch I >> submitted. For whatever reason, it no longer works on drm-next. > > I've reproduced the issue on my PinePhone and noticed that tcon0 had set > pll-video0-2x as its parent instead of pll-mipi. Having tried a whole > range of pll-video0 rates, I'm now convinced that DSI only works when > tcon0 has pll-mipi as its parent. > > As little a change as setting .clock in the default mode of PP's panel > to 73500 can fix it. Better yet, dropping pll-video0-2x from the set > of acceptable parents for tcon0 fixes it universally. And that's what > megi's kernel does, though the measure was introduced with a different > rationale: > <https://github.com/megous/linux/commit/7374d5756aa0cc3f11e494e3cbc54f6c7c01e1a8> For sake of completeness, the patch you referenced builds on this patch: https://github.com/megous/linux/commit/45e0aa8d9e34 Are you saying that your other boards and panels work without these patches? Best regards, Frank > > Roman
