[PATCH] drm/i915/display: Fix RGB limited range handling for DP
Uma Shankar
uma.shankar at intel.com
Tue Jul 1 08:17:56 UTC 2025
RGB limited range should be selected only if explicitly asked by
userspace by the broadcast RGB property with LIMITED_RANGE. This
is mostly enabled in case of CEA modes.
Display port by default uses Full Range, fixed the same. This will help
set correct MSA information for colorimetry. Fixes a CTS issue wrt
colorimetry.
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f48912f308df..8758b9d60d5e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2708,8 +2708,6 @@ bool intel_dp_limited_color_range(const struct intel_crtc_state *crtc_state,
{
const struct intel_digital_connector_state *intel_conn_state =
to_intel_digital_connector_state(conn_state);
- const struct drm_display_mode *adjusted_mode =
- &crtc_state->hw.adjusted_mode;
/*
* Our YCbCr output is always limited range.
@@ -2721,18 +2719,13 @@ bool intel_dp_limited_color_range(const struct intel_crtc_state *crtc_state,
if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
return false;
- if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
- /*
- * See:
- * CEA-861-E - 5.1 Default Encoding Parameters
- * VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
- */
- return crtc_state->pipe_bpp != 18 &&
- drm_default_rgb_quant_range(adjusted_mode) ==
- HDMI_QUANTIZATION_RANGE_LIMITED;
- } else {
- return intel_conn_state->broadcast_rgb ==
- INTEL_BROADCAST_RGB_LIMITED;
+ switch (intel_conn_state->broadcast_rgb) {
+ case INTEL_BROADCAST_RGB_LIMITED:
+ return true;
+ case INTEL_BROADCAST_RGB_FULL:
+ case INTEL_BROADCAST_RGB_AUTO:
+ default:
+ return false;
}
}
--
2.42.0
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