On Sun, Apr 17, 2022 at 11:52 AM Vasily Khoruzhick <anarsoul@xxxxxxxxx> wrote: > > On Sun, Apr 17, 2022 at 9:15 AM Torsten Duwe <duwe@xxxxxx> wrote: > > > > Align the power-up sequence with the known-good procedure documented in [1]: > > un-swap dvdd12 and dvdd25, and allow a little extra time for them to settle > > before de-asserting reset. > > Hi Torsten, > > Interesting find! I tried to fix the issue several times by playing > with the delays to no avail. > > What's interesting, ANX6345 datasheet allows DVDD12 to come up either > earlier or later than DVDD25 with the delay of T1 (2ms typical) > between them, and actually bringing up DVDD12 first works fine in > u-boot. > > The datasheet also requires reset to be deasserted no earlier than T2 > (2-5ms) after all the rails are stable. > > Another thing it mentions is that the system clock must be stable for > T3 (1-3ms) before reset is deasserted, T3 is already a part of T2, > however it cannot be gated on Pinebook, see [1], page 15 > > The change looks good to me, but I'll need some time to actually test > it. If you don't hear from me for longer than a week please ping me. Your change doesn't fix the issue for me. Running "xrandr --output eDP-1 --off; xrandr --output eDP-1 --auto" in a loop triggers the issue pretty quickly even with the patch.
