[Intel-xe] [Intel-gfx] [PATCH v4 2/2] drm/i915/lnl: FBC is supported with per pixel alpha

[Ville Syrjälä]

On Thu, Sep 21, 2023 at 08:22:23AM -0500, Lucas De Marchi wrote:
> On Wed, Sep 13, 2023 at 01:38:23PM +0300, Ville Syrjälä wrote:
> >On Mon, Sep 04, 2023 at 02:55:17PM +0300, Vinod Govindapillai wrote:
> >> For LNL onwards, FBC can be supported on planes with per
> >> pixel alpha
> >>
> >> Bspec: 69560
> >> Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/display/intel_fbc.c | 3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
> >> index a3999ad95a19..c0e4caec03ea 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_fbc.c
> >> +++ b/drivers/gpu/drm/i915/display/intel_fbc.c
> >> @@ -1209,7 +1209,8 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
> >>  		return 0;
> >>  	}
> >>
> >> -	if (plane_state->hw.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> >> +	if (DISPLAY_VER(i915) < 20 &&
> >
> >Bspec still says 15. Someone needs to figure this mess out for
> >all LNL patches.
> 
> The HW reports IP version 20. The name of the IP is "Xe2-LPD (formerly Display_15)".
> For checking the display version, we don't care about the name or former
> name, we care about what is in the GMD_ID.

Well, we care what it actually means. If the bspec and hardware reported
IP version all messed up how is one supposed to know what hardware has what
features?

-- 
Ville Syrjälä
Intel
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