On Tue, 2013-07-30 at 11:57 +0100, Chris Wilson wrote: > On Tue, Jul 30, 2013 at 01:36:32PM +0300, Imre Deak wrote: > > Userspace can pass a mode with an unspecified vsync/hsync polarity > > setting. All encoders in the Intel driver take this to mean a negative > > polarity setting. The HW readout/state checker code on the other hand > > needs these flags to be explicitly set, otherwise the state checker will > > WARN about the mismatch. > > > > Get rid of the WARN by making the polarity setting explicit in the > > adjusted mode flags based on the requested mode flags. This will keep > > the existing behavior otherwise. > > > > Note that we could guess from the other timing parameters whether the > > user wanted a VESA or other standard mode and set the polarity > > accordingly. This is what the NV driver does > > (drivers/gpu/drm/nouveau/dispnv04/crtc.c), but I think that's not very > > exact and would change the existing behavior of the Intel driver. > > Right, don't guess. If the user wanted the standard mode, then the flags > would have been taken from the standard modeline. > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65442 > > You can add a tested-by here for qa. Tested-by: Cancan Feng <cancan.feng@xxxxxxxxx> > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> > Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> CC'ing people who might be interested. After some discussion with Ville, we could refine this further at the drm core level by enforcing the Intel behavior - defaulting to negative polarity and also checking/sanitizing the PHSYNC/PVSYNC flags. PHSYNC/PVSYNC isn't used by the Intel driver so we could still go with the above patch for now and follow-up with a drm core fix. We should probably also reject modes at drm core level where both positive and negative flags are set, again in a separate follow-up patch. --Imre
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