drm/i915/alpm: Share alpm support checks with PSR code

Convert intel_alpm_aux_wake_supported and
intel_alpm_aux_less_wake_supported as non-static. Use them in intel_psr.c
instead of local variables.
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240607134917.1327574-8-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_alpm.c

@@ -11,12 +11,12 @@
 #include "intel_dp_aux.h"
 #include "intel_psr_regs.h"
 
-static bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp)
+bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp)
 {
 	return intel_dp->alpm_dpcd & DP_ALPM_CAP;
 }
 
-static bool intel_alpm_aux_less_wake_supported(struct intel_dp *intel_dp)
+bool intel_alpm_aux_less_wake_supported(struct intel_dp *intel_dp)
 {
 	return intel_dp->alpm_dpcd & DP_ALPM_AUX_LESS_CAP;
 }

drivers/gpu/drm/i915/display/intel_alpm.h

@@ -22,4 +22,6 @@ void intel_alpm_lobf_compute_config(struct intel_dp *intel_dp,
 void intel_alpm_configure(struct intel_dp *intel_dp,
 			  const struct intel_crtc_state *crtc_state);
 void intel_alpm_lobf_debugfs_add(struct intel_connector *connector);
+bool intel_alpm_aux_wake_supported(struct intel_dp *intel_dp);
+bool intel_alpm_aux_less_wake_supported(struct intel_dp *intel_dp);
 #endif

drivers/gpu/drm/i915/display/intel_psr.c

@@ -446,16 +446,6 @@ void intel_psr_irq_handler(struct intel_dp *intel_dp, u32 psr_iir)
 	}
 }
 
-static bool intel_dp_get_alpm_status(struct intel_dp *intel_dp)
-{
-	u8 alpm_caps = 0;
-
-	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_RECEIVER_ALPM_CAP,
-			      &alpm_caps) != 1)
-		return false;
-	return alpm_caps & DP_ALPM_CAP;
-}
-
 static u8 intel_dp_get_sink_sync_latency(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
@@ -600,7 +590,6 @@ static void _psr_init_dpcd(struct intel_dp *intel_dp)
 	    intel_dp->psr_dpcd[0] >= DP_PSR2_WITH_Y_COORD_IS_SUPPORTED) {
 		bool y_req = intel_dp->psr_dpcd[1] &
 			     DP_PSR2_SU_Y_COORDINATE_REQUIRED;
-		bool alpm = intel_dp_get_alpm_status(intel_dp);
 
 		/*
 		 * All panels that supports PSR version 03h (PSR2 +
@@ -613,7 +602,8 @@ static void _psr_init_dpcd(struct intel_dp *intel_dp)
 		 * Y-coordinate requirement panels we would need to enable
 		 * GTC first.
 		 */
-		intel_dp->psr.sink_psr2_support = y_req && alpm;
+		intel_dp->psr.sink_psr2_support = y_req &&
+			intel_alpm_aux_wake_supported(intel_dp);
 		drm_dbg_kms(&i915->drm, "PSR2 %ssupported\n",
 			    intel_dp->psr.sink_psr2_support ? "" : "not ");
 	}