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

[Matt Atwood]

From: Suraj Kandpal <suraj.kandpal at intel.com>

We only support resolution upto 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>
Signed-off-by: Matt Atwood <matthew.s.atwood at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 205ec315b413..8bccc6e0b5b3 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1396,6 +1396,7 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 	struct intel_display *display = to_intel_display(_connector->dev);
 	struct intel_connector *connector = to_intel_connector(_connector);
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
+	enum intel_output_format sink_format;
 	const struct drm_display_mode *fixed_mode;
 	int target_clock = mode->clock;
 	int max_rate, mode_rate, max_lanes, max_link_clock;
@@ -1429,6 +1430,13 @@ 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 (num_joined_pipes == 1) {
+		if (sink_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
+		    mode->hdisplay > 4096)
+			return MODE_NO_420;
+	}
+
 	if (target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
@@ -1444,10 +1452,9 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 					   intel_dp_mode_min_output_bpp(connector, mode));
 
 	if (intel_dp_has_dsc(connector)) {
-		enum intel_output_format sink_format, output_format;
+		enum intel_output_format output_format;
 		int pipe_bpp;
 
-		sink_format = intel_dp_sink_format(connector, mode);
 		output_format = intel_dp_output_format(connector, sink_format);
 		/*
 		 * TBD pass the connector BPC,
-- 
2.45.0