From: Jani Nikula <jani.nikula@intel.com>
Date: Tue, 11 Feb 2014 09:52:04 +0000 (+0200)
Subject: drm/i915/dp: increase native aux defer retry timeout
X-Git-Tag: submit/tizen_common/20140905.094502~491
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4a036dd40a68428a35f3272a3275b3f35099dd43;p=sdk%2Femulator%2Femulator-kernel.git

drm/i915/dp: increase native aux defer retry timeout

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>
Cc: stable@vger.kernel.org (on Jani's request)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5a97f7356843..e5c79ae1614b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -467,7 +467,7 @@ 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;
 	}
@@ -516,7 +516,7 @@ 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;
 	}