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From: Aurabindo Pillai <aurabindo.pillai@amd.com>
To: <amd-gfx@lists.freedesktop.org>
Cc: Wesley Chalmers <Wesley.Chalmers@amd.com>,
	Eryk.Brol@amd.com, Sunpeng.Li@amd.com, Harry.Wentland@amd.com,
	Qingqing.Zhuo@amd.com, Rodrigo.Siqueira@amd.com,
	Anson.Jacob@amd.com, Aurabindo.Pillai@amd.com,
	Jun Lei <Jun.Lei@amd.com>,
	Bhawanpreet.Lakha@amd.com, bindu.r@amd.com
Subject: [PATCH 09/19] drm/amd/display: Unconditionally clear training pattern set after lt
Date: Fri, 16 Apr 2021 10:34:07 -0400
Message-ID: <20210416143417.611019-10-aurabindo.pillai@amd.com> (raw)
In-Reply-To: <20210416143417.611019-1-aurabindo.pillai@amd.com>

From: Wesley Chalmers <Wesley.Chalmers@amd.com>

[WHY]
While Link Training is being performed,
and the LTTPRs are in Non-LTTPR or LTTPR Transparent mode,
any DPCD registers besides those used for Link Training are not to be
accessed.

The spec defines the link training registers as DP_TRAINING_PATTERN_SET
(102h) to DP_TRAINING_LANE3_SET (106h), and DP_LANE0_1_STATUS (202h)
to DP_ADJUST_REQUEST_LANE2_3 (207h).

[HOW]
Move the current write to DPCD Address DP_LINK_TRAINING_PATTERN_SET out
of its conditional block.

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index e6f8f3c255bc..bbf2865b25c5 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1132,11 +1132,6 @@ static inline enum link_training_result perform_link_training_int(
 	enum link_training_result status)
 {
 	union lane_count_set lane_count_set = { {0} };
-	union dpcd_training_pattern dpcd_pattern = { {0} };
-
-	/* 3. set training not in progress*/
-	dpcd_pattern.v1_4.TRAINING_PATTERN_SET = DPCD_TRAINING_PATTERN_VIDEOIDLE;
-	dpcd_set_training_pattern(link, dpcd_pattern);
 
 	/* 4. mainlink output idle pattern*/
 	dp_set_hw_test_pattern(link, DP_TEST_PATTERN_VIDEO_MODE, NULL, 0);
@@ -1560,6 +1555,7 @@ enum link_training_result dc_link_dp_perform_link_training(
 {
 	enum link_training_result status = LINK_TRAINING_SUCCESS;
 	struct link_training_settings lt_settings;
+	union dpcd_training_pattern dpcd_pattern = { { 0 } };
 
 	bool fec_enable;
 	uint8_t repeater_cnt;
@@ -1624,6 +1620,9 @@ enum link_training_result dc_link_dp_perform_link_training(
 		}
 	}
 
+	/* 3. set training not in progress*/
+	dpcd_pattern.v1_4.TRAINING_PATTERN_SET = DPCD_TRAINING_PATTERN_VIDEOIDLE;
+	dpcd_set_training_pattern(link, dpcd_pattern);
 	if ((status == LINK_TRAINING_SUCCESS) || !skip_video_pattern) {
 		status = perform_link_training_int(link,
 				&lt_settings,
-- 
2.31.1

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  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 14:33 [PATCH 00/19] DC Patches for 2021 April 19 Aurabindo Pillai
2021-04-16 14:33 ` [PATCH 01/19] drm/amd/display: fixed divide by zero kernel crash during dsc enablement Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 02/19] drm/amd/display: Add DSC check to seamless boot validation Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 03/19] drm/amd/display: update hdcp display using correct CP type Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 04/19] drm/amd/display: add handling for hdcp2 rx id list validation Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 05/19] drm/amd/display: disable seamless boot for external DP Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 06/19] drm/amd/display: removed unused function dc_link_reallocate_mst_payload Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 07/19] drm/amd/display: treat memory as a single-channel for asymmetric memory v2 Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 08/19] drm/amd/display: Fix FreeSync when RGB MPO in use Aurabindo Pillai
2021-04-16 14:34 ` Aurabindo Pillai [this message]
2021-04-16 14:34 ` [PATCH 10/19] drm/amd/display: Add link rate optimization logs for ILR Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 11/19] drm/amd/display: Always poll for rxstatus in authenticate Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 12/19] drm/amd/display: Fixed typo in function name Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 13/19] drm/amd/display: force CP to DESIRED when removing display Aurabindo Pillai
2021-04-19 15:42   ` Pillai, Aurabindo
2021-04-16 14:34 ` [PATCH 14/19] drm/amd/display: fix HDCP drm prop update for MST Aurabindo Pillai
2021-04-19 15:42   ` Pillai, Aurabindo
2021-04-16 14:34 ` [PATCH 15/19] drm/amd/display: Fix call to pass bpp in 16ths of a bit Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 16/19] drm/amd/display: Report Proper Quantization Range in AVI Infoframe Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 17/19] drm/amd/display: add helper for enabling mst stream features Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 18/19] drm/amd/display: [FW Promotion] Release 0.0.62 Aurabindo Pillai
2021-04-16 14:34 ` [PATCH 19/19] drm/amd/display: 3.2.132 Aurabindo Pillai
2021-04-19 15:45 ` [PATCH 00/19] DC Patches for 2021 April 19 Wheeler, Daniel

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