drm/i915/dp: Check for AUXCH error before checking for success

This is paranoid, but I am entirely willing to believe the hardware
could come up with a condition where I get a status with both the 'done'
and 'receive error' bits set.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 2f4766385797..8f1148c04108 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -426,6 +426,10 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
                            DP_AUX_CH_CTL_DONE |
                            DP_AUX_CH_CTL_TIME_OUT_ERROR |
                            DP_AUX_CH_CTL_RECEIVE_ERROR);
+
+                if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR |
+                              DP_AUX_CH_CTL_RECEIVE_ERROR))
+                        continue;
                 if (status & DP_AUX_CH_CTL_DONE)
                         break;
         }