Attachment 34531 Details for Bug 27314 – possible link training fix

[patch] possible link training fix

0001-drm-radeon-kms-dp-link-training-fix.patch (text/plain), 1.41 KB, created by Alex Deucher on 2010-03-29 11:19:53 UTC

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Creator: Alex Deucher

Created: 2010-03-29 11:19:53 UTC

Size: 1.41 KB

patch

obsolete

>From 55b5209f247461d0a522ee74cc3c1ea11ccf4314 Mon Sep 17 00:00:00 2001
>From: Alex Deucher <alexdeucher@gmail.com>
>Date: Mon, 29 Mar 2010 14:15:34 -0400
>Subject: [PATCH] drm/radeon/kms/dp: link training fix
>
>For phase two of link training, set the training
>pattern on the source before the sink (same as
>phase 1).
>
>May fix fdo bug 27314
>
>Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
>---
> drivers/gpu/drm/radeon/atombios_dp.c |    5 +++--
> 1 files changed, 3 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
>index ca776b2..19d52ae 100644
>--- a/drivers/gpu/drm/radeon/atombios_dp.c
>+++ b/drivers/gpu/drm/radeon/atombios_dp.c
>@@ -701,8 +701,6 @@ void dp_link_train(struct drm_encoder *encoder,
> 			  DP_TRAIN_PRE_EMPHASIS_SHIFT);
> 
> 
>-	/* set training pattern 2 on the sink */
>-	dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
> 	/* set training pattern 2 on the source */
> 	if (ASIC_IS_DCE4(rdev))
> 		atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_LINK_TRAINING_PATTERN2);
>@@ -710,6 +708,9 @@ void dp_link_train(struct drm_encoder *encoder,
> 		radeon_dp_encoder_service(rdev, ATOM_DP_ACTION_TRAINING_PATTERN_SEL,
> 					  dig_connector->dp_clock, enc_id, 1);
> 
>+	/* set training pattern 2 on the sink */
>+	dp_set_training(radeon_connector, DP_TRAINING_PATTERN_2);
>+
> 	/* channel equalization loop */
> 	tries = 0;
> 	channel_eq = false;
>-- 
>1.5.6.3
>

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