From: Imre Deak <imre.deak@intel.com>
Date: Mon, 16 Feb 2026 07:04:18 +0000 (+0200)
Subject: drm/i915/dp: Add missing slice count check during mode validation
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=777a02812f739af9e349cd0f695400a1d84053f4;p=linux-2.6-microblaze.git

drm/i915/dp: Add missing slice count check during mode validation

Add the missing check for a valid slice count during
mode validation when DSC is enabled.

Cc: Vinod Govindapillai <vinod.govindapillai@intel.com>
Fixes: 745395b51c26 ("drm/i915/dp: Add intel_dp_mode_valid_with_dsc()")
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260216070421.714884-2-imre.deak@intel.com
(cherry picked from commit ec4db429fd38e5c5cbea3521049739fd2718845c)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e9f1ee1eafae..559cf3bb23fd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2557,6 +2557,9 @@ bool intel_dp_mode_valid_with_dsc(struct intel_connector *connector,
 	if (min_bpp_x16 <= 0 || min_bpp_x16 > max_bpp_x16)
 		return false;
 
+	if (dsc_slice_count == 0)
+		return false;
+
 	return is_bw_sufficient_for_dsc_config(intel_dp,
 					       link_clock, lane_count,
 					       mode_clock, mode_hdisplay,