[PATCH 4/4] drm/i915/xe3lpd: Prune modes for YUV420

[Suraj Kandpal]

We only support resolution up to 4k for single pipe when using
YUV420 format so we prune these modes and restrict the plane size
at src.

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c            | 6 ++++++
 drivers/gpu/drm/i915/display/skl_universal_plane.c | 5 ++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 6cdc968522df..1823b509cbfb 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1374,6 +1374,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 {
 	struct intel_connector *connector = to_intel_connector(_connector);
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
+	enum intel_output_format sink_format;
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	const struct drm_display_mode *fixed_mode;
 	int target_clock = mode->clock;
@@ -1408,6 +1409,11 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 						     mode->hdisplay, target_clock);
 	max_dotclk *= num_joined_pipes;
 
+	sink_format = intel_dp_sink_format(connector, mode);
+	if (sink_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
+	    mode->hdisplay > 4096)
+		return MODE_NO_420;
+
 	if (target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 4dec9e693218..5b1f6069e5da 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -435,7 +435,10 @@ static int xe3_plane_max_width(const struct drm_framebuffer *fb,
 			       int color_plane,
 			       unsigned int rotation)
 {
-	return 6144;
+	if (intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
+		return 4096;
+	else
+		return 6144;
 }
 
 static int icl_hdr_plane_max_width(const struct drm_framebuffer *fb,
-- 
2.47.0