drm/i915/display: Add PSR interrupt error check function

In order to reuse code of PSR interrupt error check on other PSR functions,
it adds psr_interrupt_error_check() function.

Cc: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210519000625.3184321-13-lucas.demarchi@intel.com

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

@@ -1030,27 +1030,11 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 			     IGNORE_PSR2_HW_TRACKING : 0);
 }
 
-static void intel_psr_enable_locked(struct intel_dp *intel_dp,
-				    const struct intel_crtc_state *crtc_state,
-				    const struct drm_connector_state *conn_state)
+static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
 {
-	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	struct intel_encoder *encoder = &dig_port->base;
 	u32 val;
 
-	drm_WARN_ON(&dev_priv->drm, intel_dp->psr.enabled);
-
-	intel_dp->psr.psr2_enabled = crtc_state->has_psr2;
-	intel_dp->psr.busy_frontbuffer_bits = 0;
-	intel_dp->psr.pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
-	intel_dp->psr.transcoder = crtc_state->cpu_transcoder;
-	/* DC5/DC6 requires at least 6 idle frames */
-	val = usecs_to_jiffies(intel_get_frame_time_us(crtc_state) * 6);
-	intel_dp->psr.dc3co_exit_delay = val;
-	intel_dp->psr.dc3co_exitline = crtc_state->dc3co_exitline;
-	intel_dp->psr.psr2_sel_fetch_enabled = crtc_state->enable_psr2_sel_fetch;
-
 	/*
 	 * If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
 	 * will still keep the error set even after the reset done in the
@@ -1071,9 +1055,36 @@ static void intel_psr_enable_locked(struct intel_dp *intel_dp,
 		intel_dp->psr.sink_not_reliable = true;
 		drm_dbg_kms(&dev_priv->drm,
 			    "PSR interruption error set, not enabling PSR\n");
-		return;
+		return false;
 	}
 
+	return true;
+}
+
+static void intel_psr_enable_locked(struct intel_dp *intel_dp,
+				    const struct intel_crtc_state *crtc_state,
+				    const struct drm_connector_state *conn_state)
+{
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_encoder *encoder = &dig_port->base;
+	u32 val;
+
+	drm_WARN_ON(&dev_priv->drm, intel_dp->psr.enabled);
+
+	intel_dp->psr.psr2_enabled = crtc_state->has_psr2;
+	intel_dp->psr.busy_frontbuffer_bits = 0;
+	intel_dp->psr.pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
+	intel_dp->psr.transcoder = crtc_state->cpu_transcoder;
+	/* DC5/DC6 requires at least 6 idle frames */
+	val = usecs_to_jiffies(intel_get_frame_time_us(crtc_state) * 6);
+	intel_dp->psr.dc3co_exit_delay = val;
+	intel_dp->psr.dc3co_exitline = crtc_state->dc3co_exitline;
+	intel_dp->psr.psr2_sel_fetch_enabled = crtc_state->enable_psr2_sel_fetch;
+
+	if (!psr_interrupt_error_check(intel_dp))
+		return;
+
 	drm_dbg_kms(&dev_priv->drm, "Enabling PSR%s\n",
 		    intel_dp->psr.psr2_enabled ? "2" : "1");
 	intel_dp_compute_psr_vsc_sdp(intel_dp, crtc_state, conn_state,