From: Jim Bride <jim.br...@linux.intel.com>
According to the HSW b-spec we need to try clock divisors of 63
and 72, each 3 or more times, when attempting DP AUX channel
communication on a server chipset. This actually wasn't happening
due to a short-circuit that only checked the DP_AUX_CH_CTL_DONE bit
in status rather than checking that the operation was done and
that DP_AUX_CH_CTL_TIME_OUT_ERROR was not set.
Signed-off-by: Jim Bride <jim.br...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0edc305..c01a3f9 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -895,7 +895,8 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
if (status & DP_AUX_CH_CTL_DONE)
break;
}
- if (status & DP_AUX_CH_CTL_DONE)
+ if ((status & DP_AUX_CH_CTL_DONE) &&
+ !(status & DP_AUX_CH_CTL_TIME_OUT_ERROR))
break;
}
--
1.9.1
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