drm/i915/display/fbc: Implement WA 22010751166

BugLink: https://bugs.launchpad.net/bugs/1914412

Underruns happens when plane height + y offset is not a modulo of 4
when FBC is enabled. It happens when scanline is at vactive - 10 but
that is not feasible to do from the software side so here completely
disabling FBC when height + y offset matches to avoid visual glitches.

Specification says that it only affects TGL display C stepping and
newer but to simply the check and as TGL is already in final costumers
hands, pre-production display stepping A and B was also included.

BSpec: 52887 ICL
BSpec: 52888 EHL/JSL
BSpec: 52890/55378 TGL
BSpec: 53508 DG1
BSpec: 53273 RKL
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201019175609.28715-1-jose.souza@intel.com
(cherry picked from commit a21906e)
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>

drivers/gpu/drm/i915/display/intel_fbc.c

@@ -907,6 +907,13 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
 		return false;
 	}
 
+	/* Wa_22010751166: icl, ehl, tgl, dg1, rkl */
+	if (INTEL_GEN(dev_priv) >= 11 &&
+	    (cache->plane.src_h + cache->plane.adjusted_y) % 4) {
+		fbc->no_fbc_reason = "plane height + offset is non-modulo of 4";
+		return false;
+	}
+
 	return true;
 }