On Tue, Sep 24, 2013 at 11:46:14AM +0200, Daniel Vetter wrote: > This regression has been introduced in > > commit 9f11a9e4e50006b615ba94722dfc33ced89664cf > Author: Daniel Vetter <daniel.vetter@xxxxxxxx> > Date: Thu Jun 13 00:54:58 2013 +0200 > > drm/i915: set up PIPECONF explicitly for i9xx/vlv platforms > > Ville brough up the idea that this is just the pipe A quirk gone > wrong. > > Note that after resume the bios might or might not have enabled pipe A > already. We have a bit of magic to make sure that on resume we set up > a decent mode for pipe A, but I fear if I just smash pipe A to always > on we'd enable it in a bogus state and hang the hw. Hence the > readback. > > v2: Clarify the logic a bit as suggested by Chris. Also amend the > commit message to clarify why we don't unconditionally enable the > pipe. > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=66462 > References: https://lkml.org/lkml/2013/8/26/238 > Cc: Meelis Roos <mroos@xxxxx> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> would still prefer pipeconf |= PIPECONF_ENABLE though. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
