From 0d8038a3d3f72bb36a364e1ab7f57d36ff207f9f Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Wed, 1 Oct 2014 07:32:37 -0700 Subject: [PATCH] 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 06d35b2b24a3bf448d8532c10b1cf1ac1f920ba3 Author: Rodrigo Vivi 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 Cc: Todd Previte Signed-off-by: Rodrigo Vivi Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index b2aedcf8c8ecd..50bcd09f53be4 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3875,16 +3875,21 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) 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 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc) 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; } -- 2.39.5