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Subject[PATCH 3.11 025/131] drm/i915/dp: increase native aux defer retry timeout
Date
3.11.10.6 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jani Nikula <jani.nikula@intel.com>

commit 04eada25d1f72efdecd32d702706594f81de65d5 upstream.

Give more slack to sink devices before retrying on native aux
defer. AFAICT the 100 us timeout was not based on the DP spec.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[ luis: backported to 3.11: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/gpu/drm/i915/intel_dp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e7c46aa..d701eb6 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -464,7 +464,7 @@ intel_dp_aux_native_write(struct intel_dp *intel_dp,
if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
break;
else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
- udelay(100);
+ usleep_range(400, 500);
else
return -EIO;
}
@@ -513,7 +513,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
return ret - 1;
}
else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
- udelay(100);
+ usleep_range(400, 500);
else
return -EIO;
}
--
1.9.0


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