AUX HW timeout is being set to max(4000ms), consider AUX SW timeout to
be 200ms more to avoid AUX boundary read//write.
HSDES: 1409498780
Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_aux.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index 664bebdecea7..6c1c9602518b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -293,14 +293,13 @@ intel_dp_aux_xfer(struct intel_dp *intel_dp,
DP_AUX_CH_CTL_RECEIVE_ERROR);
/*
- * DP CTS 1.2 Core Rev 1.1, 4.2.1.1 & 4.2.1.2
- * 400us delay required for errors and timeouts
- * Timeout errors from the HW already meet this
- * requirement so skip to next iteration
+ * Once the hw timeouts, before next try
+ * need to add a sw timeout of 200usec(HSD: 1409498780).
*/
- if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR)
+ if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
+ usleep_range(200, 300);
continue;
-
+ }
if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
usleep_range(400, 500);
continue;
--
2.25.1
