[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 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e0baad468d76..edaea5e8c53c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1373,6 +1373,7 @@ 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;
@@ -1407,6 +1408,11 @@ 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;
 
-- 
2.34.1