[Intel-gfx] [PATCH] drm/i915: Fix skl srckey mask bits

[Ville Syrjälä]

On Fri, Jan 25, 2019 at 01:54:47PM -0800, Matt Roper wrote:
> On Fri, Jan 25, 2019 at 08:38:46PM +0200, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > 
> > We're incorrectly masking off the R/V channel enable bit from
> > KEYMSK. Fix it up.
> > 
> > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > Cc: Matt Roper <matthew.d.roper at intel.com>
> > Fixes: b20815255693 ("drm/i915: Add plane alpha blending support, v2.")
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> The "srckey" terminology in the headline is a bit confusing since the
> channel mask applies to both "destination colorkey" and "source
> colorkey" behavior.

Does it? IIRC it used to be only for source keying. I guess I'll have to
try it for reals.

> Otherwise,
> 
> Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
> 
> Out of curiousity, has there ever been a userspace consumer of source
> colorkey?  I know SNA uses destination colorkey (for Xv), but not source
> colorkey.  And afaik, UXA never did any colorkeying through the sprite
> interface at all.

No, I don't think we have any userspace for this.

> 
> 
> Matt
> 
> > ---
> >  drivers/gpu/drm/i915/intel_sprite.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> > index b02d3d9809e3..cd42e81f8a90 100644
> > --- a/drivers/gpu/drm/i915/intel_sprite.c
> > +++ b/drivers/gpu/drm/i915/intel_sprite.c
> > @@ -493,7 +493,7 @@ skl_program_plane(struct intel_plane *plane,
> >  
> >  	keymax = (key->max_value & 0xffffff) | PLANE_KEYMAX_ALPHA(alpha);
> >  
> > -	keymsk = key->channel_mask & 0x3ffffff;
> > +	keymsk = key->channel_mask & 0x7ffffff;
> >  	if (alpha < 0xff)
> >  		keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
> >  
> > -- 
> > 2.19.2
> > 
> 
> -- 
> Matt Roper
> Graphics Software Engineer
> IoTG Platform Enabling & Development
> Intel Corporation
> (916) 356-2795

-- 
Ville Syrjälä
Intel