From 1ae15b6c7965d137eef21f2cc7d367b29cb88369 Mon Sep 17 00:00:00 2001 From: Chaitanya Kumar Borah Date: Tue, 5 May 2026 14:39:20 +0530 Subject: [PATCH] drm/i915/dp: Fix VSC dynamic range signaling for RGB formats For RGB, set dynamic_range to CTA or VESA based on crtc_state->limited_color_range so sinks apply correct quantization. YCbCr remains limited (CTA) range. (DP v1.4, Table 5-1) v2: - Added Reported-by and Tested-by tags v3: - Add back YCbCr comment(Suraj) Cc: stable@vger.kernel.org #v5.8+ Reported-by: DeepChirp Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/work_items/15874 Tested-by: DeepChirp Fixes: 9799c4c3b76e ("drm/i915/dp: Add compute routine for DP VSC SDP") Assisted-by: GitHub-Copilot:GPT-5.4 Signed-off-by: Chaitanya Kumar Borah Reviewed-by: Suraj Kandpal Signed-off-by: Suraj Kandpal Link: https://patch.msgid.link/20260505090920.2479112-1-chaitanya.kumar.borah@intel.com (cherry picked from commit 38e10ddae6f8d42a2e8437fcd25a1cac51106c64) Signed-off-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/display/intel_dp.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 4955bd8b11d7..50d34b4fdf82 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -3119,8 +3119,13 @@ static void intel_dp_compute_vsc_colorimetry(const struct intel_crtc_state *crtc drm_WARN_ON(display->drm, vsc->bpc == 6 && vsc->pixelformat != DP_PIXELFORMAT_RGB); - /* all YCbCr are always limited range */ - vsc->dynamic_range = DP_DYNAMIC_RANGE_CTA; + /* All YCbCr formats are always limited range. */ + if (vsc->pixelformat == DP_PIXELFORMAT_RGB) + vsc->dynamic_range = crtc_state->limited_color_range ? + DP_DYNAMIC_RANGE_CTA : DP_DYNAMIC_RANGE_VESA; + else + vsc->dynamic_range = DP_DYNAMIC_RANGE_CTA; + vsc->content_type = DP_CONTENT_TYPE_NOT_DEFINED; }