[Intel-gfx] [PATCH] drm/i915: Apply Wa_14011264657:gen11+

[Matt Atwood]

On Tue, Jun 16, 2020 at 08:34:07PM +0300, Ville Syrjälä wrote:
> On Tue, Jun 16, 2020 at 09:34:06AM -0700, Matt Atwood wrote:
> > Add minimum width to planes, variable with specific formats, for gen11+.
> > 
> > Signed-off-by: Matt Atwood <matthew.s.atwood at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display.c | 55 +++++++++++++++++---
> >  1 file changed, 47 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> > index 7457813ef273..d4fdad6cb3b1 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -3760,6 +3760,45 @@ static int glk_max_plane_width(const struct drm_framebuffer *fb,
> >  	}
> >  }
> >  
> > +static int icl_min_plane_width(struct drm_i915_private *dev_priv,
> > +				 const struct drm_framebuffer *fb)
> > +{
> > +	/* Wa_14011264657, Wa_14011050563 */
> > +	switch (fb->format->format) {
> > +	case DRM_FORMAT_C8:
> > +		return 18;
> > +	case DRM_FORMAT_RGB565:
> > +		return 10;
> > +	case DRM_FORMAT_XRGB8888:
> > +	case DRM_FORMAT_XBGR8888:
> > +	case DRM_FORMAT_ARGB8888:
> > +	case DRM_FORMAT_ABGR8888:
> > +	case DRM_FORMAT_XRGB2101010:
> > +	case DRM_FORMAT_XBGR2101010:
> > +	case DRM_FORMAT_ARGB2101010:
> > +	case DRM_FORMAT_ABGR2101010:
> > +	case DRM_FORMAT_XVYU2101010:
> > +	case DRM_FORMAT_Y212:
> > +	case DRM_FORMAT_Y216:
> > +		return 6;
> > +	case DRM_FORMAT_NV12:
> > +		return 20;
> > +	case DRM_FORMAT_P010:
> > +	case DRM_FORMAT_P012:
> > +	case DRM_FORMAT_P016:
> > +		return 12;
> > +	case DRM_FORMAT_XRGB16161616F:
> > +	case DRM_FORMAT_XBGR16161616F:
> > +	case DRM_FORMAT_ARGB16161616F:
> > +	case DRM_FORMAT_ABGR16161616F:
> > +	case DRM_FORMAT_XVYU12_16161616:
> > +	case DRM_FORMAT_XVYU16161616:
> > +		return 4;
> > +	default:
> > +		return 1;
> > +	}
> 
> if (semiplanar) {
> 	switch (cpp[0]) {
> 	case 1:
> 		return 20;
> 	case 2:
> 		return 12;
> 	}
> } else {
> 	switch (cpp[0]) {
> 	case 1:
> 		return 18;
> 	case 2:
> 		return 10;
> 	case 4:
> 		return 6;
> 	case 8:
> 		return 4;
> 	}
> }
> 
> Actually if we fully reverse engineer this we are left with just:
> if (semiplanar)
> 	return 16/cpp[0] + 4;
> else
> 	return 16/cpp[0] + 2;
> 
> I'd much prefer calculating this since then it's fully divorced from
> defining new pixel formats. Can we get a confirmation from the hw
> folks if that is in fact the formula (or if there's a different formula
> how they came up with these magic numbers)?
Verified with hardware folks the above doesnt always work for some of
the cases that we need to support.
> 
> > +}
> > +
> >  static int icl_max_plane_width(const struct drm_framebuffer *fb,
> >  			       int color_plane,
> >  			       unsigned int rotation)
> > @@ -3831,15 +3870,15 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
> >  	int y = plane_state->uapi.src.y1 >> 16;
> >  	int w = drm_rect_width(&plane_state->uapi.src) >> 16;
> >  	int h = drm_rect_height(&plane_state->uapi.src) >> 16;
> > -	int max_width;
> > -	int max_height;
> > -	u32 alignment;
> > -	u32 offset;
> > +	int max_width, min_width = 1, max_height;
> > +	u32 alignment, offset;
> >  	int aux_plane = intel_main_to_aux_plane(fb, 0);
> >  	u32 aux_offset = plane_state->color_plane[aux_plane].offset;
> >  
> > -	if (INTEL_GEN(dev_priv) >= 11)
> > +	if (INTEL_GEN(dev_priv) >= 11) {
> >  		max_width = icl_max_plane_width(fb, 0, rotation);
> > +		min_width = icl_min_plane_width(dev_priv, fb);
> > +	}
> >  	else if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv))
> 
> Missing curly braces on all the branches. Feels like dejavu...
> 
> I'd also do the min_width=1 assignment in each branch to make it
> clear what's what.
> 
> >  		max_width = glk_max_plane_width(fb, 0, rotation);
> >  	else
> > @@ -3850,10 +3889,10 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
> >  	else
> >  		max_height = skl_max_plane_height();
> >  
> > -	if (w > max_width || h > max_height) {
> > +	if (w > max_width || w < min_width || h > max_height) {
> >  		drm_dbg_kms(&dev_priv->drm,
> > -			    "requested Y/RGB source size %dx%d too big (limit %dx%d)\n",
> > -			    w, h, max_width, max_height);
> > +			    "requested Y/RGB source size %dx%d outside limits (min: %dx1 max: %dx%d)\n",
> > +			    w, h, min_width, max_width, max_height);
> >  		return -EINVAL;
> >  	}
> >  
> > -- 
> > 2.21.3
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Ville Syrjälä
> Intel