From: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Date: Thu, 30 Apr 2026 13:12:16 +0000 (+0530)
Subject: drm/i915/intel_sdvo: Check fixed_mode->clock against max_dotclock in mode_valid
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=dae483da59657eba80efa0437b72f14d221e1f03;p=thirdparty%2Fkernel%2Flinux.git

drm/i915/intel_sdvo: Check fixed_mode->clock against max_dotclock in mode_valid

For LVDS SDVO, mode validation checks the requested mode against the
pipe max dotclock, but does not validate the selected fixed mode clock.

After intel_panel_mode_valid(), get the fixed mode and validate its
clock against the max dotclock.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260430131220.3891497-2-ankit.k.nautiyal@intel.com
---

diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 2e1af9e869de..e7aaa5b203fd 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -1967,10 +1967,16 @@ intel_sdvo_mode_valid(struct drm_connector *connector,
 
 	if (IS_LVDS(intel_sdvo_connector)) {
 		enum drm_mode_status status;
+		const struct drm_display_mode *fixed_mode;
 
 		status = intel_panel_mode_valid(&intel_sdvo_connector->base, mode);
 		if (status != MODE_OK)
 			return status;
+
+		fixed_mode = intel_panel_fixed_mode(&intel_sdvo_connector->base, mode);
+
+		if (fixed_mode && fixed_mode->clock > max_dotclk)
+			return MODE_CLOCK_HIGH;
 	}
 
 	return MODE_OK;