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drm/i915/vrr: require valid min/max vfreq for VRR

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Ensure the EDID provided min/max vfreq are valid. Most scenarios are
already covered (by coincidence) through the checks in
intel_vrr_is_capable() and intel_vrr_is_in_range(), but be more explicit
about it. At worst, a zero min_vfreq could lead to a division by zero in
intel_vrr_compute_vmax().

Discovered using AI-assisted static analysis confirmed by Intel Product
Security.

Reported-by: Martin Hodo <martin.hodo@intel.com>
Fixes: 117cd09ba5 ("drm/i915/display/dp: Compute VRR state in atomic_check")
Cc: stable@vger.kernel.org # v5.12+
Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260625131040.1051272-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 1765cf59f5)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Jani Nikula
2026-06-25 16:10:40 +03:00
committed by Joonas Lahtinen
parent db9e64c983
commit f8a9262c7a
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/display/intel_vrr.c
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@@ -74,6 +74,10 @@ bool intel_vrr_is_capable(struct intel_connector *connector)
return false;
}
if (!info->monitor_range.min_vfreq || !info->monitor_range.max_vfreq ||
info->monitor_range.min_vfreq > info->monitor_range.max_vfreq)
return false;
return info->monitor_range.max_vfreq - info->monitor_range.min_vfreq > 10;
}