[Intel-gfx] [PATCH] drm/i915: Add PLANE_CUS_CTL restriction in max_width

[Vidya Srinivas <vidya.srinivas@intel.com>]

PLANE_CUS_CTL has a restriction of 4096 width even though
PLANE_SIZE and scaler size registers supports max 5120.
Take care of this restriction in max_width.

Without this patch, when 5k content is sent on HDR plane
with NV12 content, FIFO underrun is seen and screen blanks
out.

v2: Addressed review comments from Ville. Added separate
functions for max_width - for HDR and SDR

v3: Addressed review comments from Ville. Changed names of
HDR and SDR max_width functions to icl_hdr_plane_max_width
and icl_sdr_plane_max_width

v4: Fixed paranthesis alignment. No code change

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Vidya Srinivas <vidya.srinivas@intel.com>
---
 .../drm/i915/display/skl_universal_plane.c    | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 28890876bdeb..e717eb58b105 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -420,9 +420,19 @@ static int icl_plane_min_width(const struct drm_framebuffer *fb,
 	}
 }
 
-static int icl_plane_max_width(const struct drm_framebuffer *fb,
-			       int color_plane,
-			       unsigned int rotation)
+static int icl_hdr_plane_max_width(const struct drm_framebuffer *fb,
+				int color_plane,
+				unsigned int rotation)
+{
+	if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
+		return 4096;
+	else
+		return 5120;
+}
+
+static int icl_sdr_plane_max_width(const struct drm_framebuffer *fb,
+				int color_plane,
+				unsigned int rotation)
 {
 	return 5120;
 }
@@ -2108,7 +2118,10 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
 
 	if (DISPLAY_VER(dev_priv) >= 11) {
 		plane->min_width = icl_plane_min_width;
-		plane->max_width = icl_plane_max_width;
+		if (icl_is_hdr_plane(dev_priv, plane_id))
+			plane->max_width = icl_hdr_plane_max_width;
+		else
+			plane->max_width = icl_sdr_plane_max_width;
 		plane->max_height = icl_plane_max_height;
 		plane->min_cdclk = icl_plane_min_cdclk;
 	} else if (DISPLAY_VER(dev_priv) >= 10) {
-- 
2.33.0