On 15/04/17 10:44, Andreas Kemnade wrote: > Hi Jyri, > > I am often seeing only some moving horizontal white strips (maybe 1-2 > pixels thick) when I boot my gta04 (omap 3 dm3730 + panel_tpo_td028ttec1 > + encoder_opa362). > > After a git bisect session, the verdict is: this patch is guilthy: > > commit 897145d0c7010b4e07fa9bc674b1dfb9a2c6fff9 > Author: Jyri Sarha <jsarha@xxxxxx> > > drm/omapdrm: Move commit_modeset_enables() before commit_planes() I was able to reproduce on my very old omap3 beagleboard. Looks very much like a omap3 DSS HW bug to me. The unfortunate thing is that even reverting the patch won't remove the issue, if the userspace happens to configure things in certain order. It looks to me that if the DSS output is enabled without an overlay (the primary plane, normally), DSS gets stuck into a bad state, and only reboot helps (because we can't reset, there's no omap hwmod reset framework). But there should be nothing wrong with that setup, and if there's first been a successful display enable, then later we can enable the DSS without any planes. So... At the moment, I have no idea how to fix it. Reverting the patch will cause other things to start breaking, but perhaps that's the only option as a short term kind-of-fix. Tomi
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