[Intel-gfx] [PATCH 4/5] drm/i915: Provide more information on DP AUX failures

[Matt Roper]

We're seeing some failures where an aux transaction still shows as
'busy' well after the timeout limit that the hardware is supposed to
enforce.  Improve the error message so that we can see exactly which aux
channel this error happened on and what the status bits were during this
case that isn't supposed to happen.

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 65bab46f7b43..2b4915b5cf52 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1190,7 +1190,8 @@ intel_dp_aux_wait_done(struct intel_dp *intel_dp)
 	trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
 
 	if (!done)
-		DRM_ERROR("dp aux hw did not signal timeout!\n");
+		DRM_ERROR("%s did not complete or timeout within 10ms (status 0x%08x)\n",
+			  intel_dp->aux.name ?: "AUX", status);
 #undef C
 
 	return status;
-- 
2.21.0