drm/i915: Rely on TEST_SINK_START instead of tracking Sink CRC state on dev_priv.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -3985,7 +3985,6 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
 		ret = -ETIMEDOUT;
 	}
 
-	intel_dp->sink_crc.started = false;
  out:
 	hsw_enable_ips(intel_crtc);
 	return ret;
@@ -3999,12 +3998,6 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 	u8 buf;
 	int ret;
 
-	if (intel_dp->sink_crc.started) {
-		ret = intel_dp_sink_crc_stop(intel_dp);
-		if (ret)
-			return ret;
-	}
-
 	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
 		return -EIO;
 
@@ -4014,6 +4007,12 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
 		return -EIO;
 
+	if (buf & DP_TEST_SINK_START) {
+		ret = intel_dp_sink_crc_stop(intel_dp);
+		if (ret)
+			return ret;
+	}
+
 	hsw_disable_ips(intel_crtc);
 
 	if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
@@ -4023,7 +4022,6 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 	}
 
 	intel_wait_for_vblank(dev, intel_crtc->pipe);
-	intel_dp->sink_crc.started = true;
 	return 0;
 }
 

drivers/gpu/drm/i915/intel_drv.h

@@ -738,10 +738,6 @@ enum link_m_n_set {
 	M2_N2
 };
 
-struct sink_crc {
-	bool started;
-};
-
 struct intel_dp {
 	uint32_t output_reg;
 	uint32_t aux_ch_ctl_reg;
@@ -759,7 +755,6 @@ struct intel_dp {
 	/* sink rates as reported by DP_SUPPORTED_LINK_RATES */
 	uint8_t num_sink_rates;
 	int sink_rates[DP_MAX_SUPPORTED_RATES];
-	struct sink_crc sink_crc;
 	struct drm_dp_aux aux;
 	uint8_t train_set[4];
 	int panel_power_up_delay;