[Intel-gfx] [PATCH 1/2] drm/i915/mtl: Added restriction for plane downscaling

[Animesh Manna]

The second Scaler (i.e. Scaler 2) does not support vertical
downscaling (i.e. it's vertical scale factor must not be greater
than 1.0). So, vertical plane downscaling is not supported on MTL,
scale factor modified accordingly.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Manasi Navare <manasi.d.navare at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index bcfde81e4d08..6bfcda748e7b 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -1464,9 +1464,12 @@ static int skl_plane_max_scale(struct drm_i915_private *dev_priv,
 	 * whether we can use the HQ scaler mode. Assume
 	 * the best case.
 	 * FIXME need to properly check this later.
+	 * FIXME On MTL, adjust specific scaler's downscaling capability.
 	 */
-	if (DISPLAY_VER(dev_priv) >= 10 ||
-	    !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
+	if (IS_METEORLAKE(dev_priv))
+		return 0x10000;
+	else if (DISPLAY_VER(dev_priv) >= 10 ||
+		 !intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
 		return 0x30000 - 1;
 	else
 		return 0x20000 - 1;
-- 
2.29.0