[Intel-gfx] [PATCH 3/3] drm/i915: Check for underruns after crtc disable

[Daniel Vetter]

On Mon, Nov 23, 2015 at 02:42:21PM +0000, Chris Wilson wrote:
> On Mon, Nov 23, 2015 at 04:10:32PM +0200, Ville Syrjälä wrote:
> > On Sat, Nov 21, 2015 at 10:49:04AM +0000, Chris Wilson wrote:
> > > On Fri, Nov 20, 2015 at 10:09:20PM +0200, ville.syrjala at linux.intel.com wrote:
> > > > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > 
> > > > To get a better idea if underruns occurred during crtc disabling,
> > > > let's check for them explicitly. This helps in cases where the
> > > > error interrupt isn't active, or there is no underrun interrupt
> > > > support at all.
> > > > 
> > > > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > 
> > > Would this be better the vblank after enabling?
> > 
> > We do that too.
> 
> Oh, crtc disabling. I can't read.

Hm, should we also double-check before disabling, to catch anything that
happened right before the modeset and avoid confusing it with underruns
happening during the modeset?

But this is a good idea already.

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch