We've seen a problem that the DP port on a docking station is often
not detected properly or misconfigured (no proper native modes) with a
Haswell-based laptop. The trace showed that the driver gave up or got
only insufficient EDID, maybe due to some unstable aux communication.
As a band-aid fix, increase the number of retries from 5 to 10.
This seems enough for our cases.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 26e162b..8491830 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -548,7 +548,7 @@ intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
break;
}
- for (retry = 0; retry < 5; retry++) {
+ for (retry = 0; retry < 10; retry++) {
ret = intel_dp_aux_ch(intel_dp,
msg, msg_bytes,
reply, reply_bytes);
--
1.8.3.1
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