commit 1dda5f930451a8b9cbe915182cc64811fd67e186
author Rodrigo Vivi <rodrigo.vivi@intel.com> Wed Oct 01 07:32:37 2014 -0700
committer Daniel Vetter <daniel.vetter@ffwll.ch> Thu Oct 02 09:46:59 2014 +0200
tree e4a51a143f3aea3a82f02b874364255d3b915494
parent bd9f74a5e7365546c9c858ca8fa585906cba3979

drm/i915: make sink_crc return -EIO on aux read/write failure

Even though it's unliky, we should check each aux transaction not just
the first one. Also

commit ce31d9f4fc05964f6c0dd3a8661dc1a1d843a1e2
Author: Rodrigo Vivi <rodrigo.vivi@intel.com>
Date:   Mon Sep 29 18:29:52 2014 -0400

    drm/i915: preserve other DP_TEST_SINK bits.

added a new aux transaction before the one which was checked. Fix
this.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Todd Previte <tprevite@gmail.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b2aedcf..50bcd09 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3875,16 +3875,21 @@
 	if (!(buf & DP_TEST_CRC_SUPPORTED))
 		return -ENOTTY;
 
-	drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf);
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
+		return -EIO;
+
 	if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
 				buf | DP_TEST_SINK_START) < 0)
 		return -EIO;
 
-	drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf);
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
+		return -EIO;
 	test_crc_count = buf & DP_TEST_COUNT_MASK;
 
 	do {
-		drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf);
+		if (drm_dp_dpcd_readb(&intel_dp->aux,
+				      DP_TEST_SINK_MISC, &buf) < 0)
+			return -EIO;
 		intel_wait_for_vblank(dev, intel_crtc->pipe);
 	} while (--attempts && (buf & DP_TEST_COUNT_MASK) == test_crc_count);
 
@@ -3896,9 +3901,11 @@
 	if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0)
 		return -EIO;
 
-	drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf);
-	drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
-			buf & ~DP_TEST_SINK_START);
+	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
+		return -EIO;
+	if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
+			       buf & ~DP_TEST_SINK_START) < 0)
+		return -EIO;
 
 	return 0;
 }