Re: [PATCH] drm/i915: Sanitize prepare_pipes after valleyview_modeset_global_pipes()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, Nov 06, 2013 at 08:33:08AM +0100, Daniel Vetter wrote:
> On Tue, Nov 05, 2013 at 10:34:12PM +0200, ville.syrjala@linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > valleyview_modeset_global_pipes() may add pipes that are getting fully
> > disabled to prepare_pipes bitmask. The rest of the code doesn't expect
> > this, so clear out any such pipes from the prepare_pipes bitmask.
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index f97e895..ddbef9c 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -9514,10 +9514,14 @@ static int __intel_set_mode(struct drm_crtc *crtc,
> >  	 * mode set on this crtc.  For other crtcs we need to use the
> >  	 * adjusted_mode bits in the crtc directly.
> >  	 */
> > -	if (IS_VALLEYVIEW(dev))
> > +	if (IS_VALLEYVIEW(dev)) {
> >  		valleyview_modeset_global_pipes(dev, &prepare_pipes,
> >  						modeset_pipes, pipe_config);
> >  
> > +		/* may have added more to prepare_pipes than we should */
> > +		prepare_pipes &= ~disable_pipes;
> > +	}
> 
> I'd have move the full "take disable_pipes out" block from affected_pipes.
> Afacs there's no need to do it twice.

I think we'd need to keep the '*modeset_pipes &= ~(*disable_pipes)' part
in intel_modeset_affected_pipes(). Otherwise we might end up calling
intel_modeset_pipe_config() for a disabled pipe. For prepare_pipes, it
looks like we could move the masking to happen only once after
valleyview_modeset_global_pipes(). Not sure if spreading it around like
that makes sense.

> -Daniel
> > +
> >  	for_each_intel_crtc_masked(dev, disable_pipes, intel_crtc)
> >  		intel_crtc_disable(&intel_crtc->base);
> >  
> > -- 
> > 1.8.1.5
> > 
> > _______________________________________________
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> > Intel-gfx@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch

-- 
Ville Syrjälä
Intel OTC