From 8ff377ae3100791aeb9ae801c0fea7e9558dee8c Mon Sep 17 00:00:00 2001 From: Animesh Manna Date: Fri, 25 Apr 2025 18:51:07 +0530 Subject: [PATCH] drm/i915/alpm: Check for alpm support before accessing alpm register 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: acff6d6bded3 ("drm/i915/lobf: Add mutex for alpm update") Signed-off-by: Animesh Manna Reviewed-by: Jonathan Cavitt Link: https://lore.kernel.org/r/20250425132107.2926759-1-animesh.manna@intel.com --- drivers/gpu/drm/i915/display/intel_alpm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c index 482dd192d47d..1bf08b80c23f 100644 --- a/drivers/gpu/drm/i915/display/intel_alpm.c +++ b/drivers/gpu/drm/i915/display/intel_alpm.c @@ -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); -- 2.50.1