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drm/i915/alpm: Check for alpm support before accessing alpm register

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Currently, only EDP supports alpm.  So, check for alpm support and prevent
the DP connector from accessing the alpm register if doing so is unsupported.

Fixes: acff6d6bde ("drm/i915/lobf: Add mutex for alpm update")
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://lore.kernel.org/r/20250425132107.2926759-1-animesh.manna@intel.com
This commit is contained in:
Animesh Manna 2025-04-25 18:51:07 +05:30
parent fcd95af591
commit 8ff377ae31
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_alpm.c
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@ -556,7 +556,7 @@ void intel_alpm_disable(struct intel_dp *intel_dp)
struct intel_display *display = to_intel_display(intel_dp);
enum transcoder cpu_transcoder = intel_dp->alpm_parameters.transcoder;
if (DISPLAY_VER(display) < 20)
if (DISPLAY_VER(display) < 20 || !intel_dp->alpm_dpcd)
return;
mutex_lock(&intel_dp->alpm_parameters.lock);