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

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

commit ce31d9f4fc
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>
This commit is contained in:
Rodrigo Vivi 2014-10-01 07:32:37 -07:00 committed by Daniel Vetter
parent bd9f74a5e7
commit 1dda5f9304
1 changed files with 13 additions and 6 deletions
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19
drivers/gpu/drm/i915/intel_dp.c
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@ -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;
}