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From: <sunpeng.li-5C7GfCeVMHo@public.gmane.org>
To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: Leo Li <sunpeng.li-5C7GfCeVMHo@public.gmane.org>,
	Abdoulaye Berthe <Abdoulaye.Berthe-5C7GfCeVMHo@public.gmane.org>,
	Jun Lei <Jun.Lei-5C7GfCeVMHo@public.gmane.org>,
	Wenjing Liu <Wenjing.Liu-5C7GfCeVMHo@public.gmane.org>
Subject: [PATCH 46/49] drm/amd/display: check hpd before retry verify link cap
Date: Fri, 9 Aug 2019 17:37:39 -0400	[thread overview]
Message-ID: <20190809213742.30301-47-sunpeng.li@amd.com> (raw)
In-Reply-To: <20190809213742.30301-1-sunpeng.li-5C7GfCeVMHo@public.gmane.org>

From: Wenjing Liu <Wenjing.Liu@amd.com>

[why]
During detection link training if a display is disconnected,
the current code will retry 3 times of link training
on disconnected link before giving up.

[how]
Before each retry check for HPD status, only retry
verify link cap when HPD is still high.
Also put a 10ms delay between each retry to improve
the chance of success.

Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Abdoulaye Berthe <Abdoulaye.Berthe@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 27 +++++--------------
 .../gpu/drm/amd/display/dc/core/dc_link_dp.c  | 27 +++++++++++++++++++
 .../gpu/drm/amd/display/dc/inc/dc_link_dp.h   |  5 ++++
 3 files changed, 38 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 1a30066ac605..78c4d07253bb 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -852,16 +852,9 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
 					dc_sink_release(prev_sink);
 				} else {
 					/* Empty dongle plug in */
-					for (i = 0; i < LINK_TRAINING_MAX_VERIFY_RETRY; i++) {
-						int fail_count = 0;
-
-						dp_verify_link_cap(link,
-								  &link->reported_link_cap,
-								  &fail_count);
-
-						if (fail_count == 0)
-							break;
-					}
+					dp_verify_link_cap_with_retries(link,
+							&link->reported_link_cap,
+							LINK_TRAINING_MAX_VERIFY_RETRY);
 				}
 				return true;
 			}
@@ -965,17 +958,9 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
 			 */
 
 			/* deal with non-mst cases */
-			for (i = 0; i < LINK_TRAINING_MAX_VERIFY_RETRY; i++) {
-				int fail_count = 0;
-
-				dp_verify_link_cap(link,
-						  &link->reported_link_cap,
-						  &fail_count);
-
-				if (fail_count == 0)
-					break;
-			}
-
+			dp_verify_link_cap_with_retries(link,
+					&link->reported_link_cap,
+					LINK_TRAINING_MAX_VERIFY_RETRY);
 		} else {
 			// If edid is the same, then discard new sink and revert back to original sink
 			if (same_edid) {
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 8e66b2e9d6af..2e87942b3e9c 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
@@ -1643,6 +1643,33 @@ bool dp_verify_link_cap(
 	return success;
 }
 
+bool dp_verify_link_cap_with_retries(
+	struct dc_link *link,
+	struct dc_link_settings *known_limit_link_setting,
+	int attempts)
+{
+	uint8_t i = 0;
+	bool success = false;
+
+	for (i = 0; i < attempts; i++) {
+		int fail_count = 0;
+		enum dc_connection_type type;
+
+		memset(&link->verified_link_cap, 0,
+				sizeof(struct dc_link_settings));
+		if (!dc_link_detect_sink(link, &type)) {
+			break;
+		} else if (dp_verify_link_cap(link,
+				&link->reported_link_cap,
+				&fail_count) && fail_count == 0) {
+			success = true;
+			break;
+		}
+		msleep(10);
+	}
+	return success;
+}
+
 static struct dc_link_settings get_common_supported_link_settings(
 		struct dc_link_settings link_setting_a,
 		struct dc_link_settings link_setting_b)
diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
index b4e7b0c56f83..08a4df2c61a8 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
@@ -38,6 +38,11 @@ bool dp_verify_link_cap(
 	struct dc_link_settings *known_limit_link_setting,
 	int *fail_count);
 
+bool dp_verify_link_cap_with_retries(
+	struct dc_link *link,
+	struct dc_link_settings *known_limit_link_setting,
+	int attempts);
+
 bool dp_validate_mode_timing(
 	struct dc_link *link,
 	const struct dc_crtc_timing *timing);
-- 
2.22.0

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  parent reply	other threads:[~2019-08-09 21:37 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 21:36 [PATCH 00/49] DC Patches 09 Aug, 2019 sunpeng.li-5C7GfCeVMHo
     [not found] ` <20190809213742.30301-1-sunpeng.li-5C7GfCeVMHo@public.gmane.org>
2019-08-09 21:36   ` [PATCH 01/49] drm/amd/display: Add PIXEL_RATE control regs for more instances sunpeng.li-5C7GfCeVMHo
2019-08-09 21:36   ` [PATCH 02/49] drm/amd/display: Add DFS reference clock field sunpeng.li-5C7GfCeVMHo
2019-08-09 21:36   ` [PATCH 03/49] drm/amd/display: reset drr programming on pipe reset sunpeng.li-5C7GfCeVMHo
2019-08-09 21:36   ` [PATCH 04/49] drm/amd/display: reset hdmi tmds rate and data scramble " sunpeng.li-5C7GfCeVMHo
2019-08-09 21:36   ` [PATCH 05/49] drm/amd/display: fix issue where 252-255 values are clipped sunpeng.li-5C7GfCeVMHo
2019-08-09 21:36   ` [PATCH 06/49] drm/amd/display: Fix frames_to_insert math sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 07/49] drm/amd/display: Add 22, 24, and 26 degamma sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 08/49] drm/amd/display: Improve sharing of HUBBUB register lists sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 09/49] drm/amd/display: Synchronous DisplayPort Link Training sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 10/49] drm/amd/display: make firmware info only load once during dc_bios create sunpeng.li-5C7GfCeVMHo
     [not found]     ` <20190809213742.30301-11-sunpeng.li-5C7GfCeVMHo@public.gmane.org>
2019-08-20 13:59       ` Mike Lothian
2019-08-09 21:37   ` [PATCH 11/49] drm/amd/display: fixup DPP programming sequence sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 12/49] drm/amd/display: Add work-around option to skip DCN20 clock updates sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 13/49] drm/amd/display: refactor gpio to allocate hw_container in constructor sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 14/49] drm/amd/display: wait for pending complete when enabling a plane sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 15/49] drm/amd/display: 3.2.43 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 16/49] drm/amd/display: Make init_hw and init_pipes generic for seamless boot sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 17/49] drm/amd/display: fix dcn-specific clk_mgr init_clocks sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 18/49] drm/amd/display: enabling seamless boot sequence for dcn2 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 19/49] drm/amd/display: clean up DML for DCN2x sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 20/49] drm/amd/display: Add HLG support in color module sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 21/49] drm/amd/display: Change DSC policy from slices per column to minimum slice height sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 22/49] drm/amd/display: Set DSC before DIG front-end is connected to its back-end sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 23/49] drm/amd/display: 3.2.44 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 24/49] drm/amd/display: fix pipe selection logic in validate sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 25/49] drm/amd/display: Remove duplicate interface for programming FB sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 26/49] drm/amd/display: Update DML parameters sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 27/49] drm/amd/display: update optc odm interface for more than 2 opps sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 28/49] drm/amd/display: HUBP/HUBBUB register programming fixes sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 29/49] drm/amd/display: Enable type C hotplug sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 30/49] drm/amd/display: reprogram VM config when system resume sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 31/49] drm/amd/display: Remove 4:2:2 DSC support sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 32/49] drm/amd/display: Add Logging for Gamma Related information (1/2) sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 33/49] drm/amd/display: Fix type of ODMCombineType field sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 34/49] drm/amd/display: Check if set_blank_data_double_buffer exists before call sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 35/49] drm/amd/display: Correct DSC PPS log sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 36/49] drm/amd/display: wake up ogam mem pwr before programming ocsc sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 37/49] drm/amd/display: Register VUPDATE_NO_LOCK interrupts for DCN2 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 38/49] drm/amd/display: Add enum for H-timing divider mode sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 39/49] drm/amd/display: Remove redundant definition of dwb_source enums sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 40/49] drm/amd/display: Add Logging for Gamma Related information (2/2) sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 41/49] drm/amd/display: Add and refine DSC logs in enable sequence sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 42/49] drm/amd/display: 3.2.45 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 43/49] drm/amd/display: fix dcn20 global sync dml param extraction sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 44/49] drm/amd/display: 3.2.46 sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 45/49] drm/amd/display: enable dcn_mem_pwr as golden setting updates sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` sunpeng.li-5C7GfCeVMHo [this message]
2019-08-09 21:37   ` [PATCH 47/49] drm/amd/display: audio cannot switch to internal when display turns off sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 48/49] drm/amd/display: Enable MPO with pre-blend color processing (RGB) sunpeng.li-5C7GfCeVMHo
2019-08-09 21:37   ` [PATCH 49/49] drm/amd/display: Load NV12 SOC BB from firmware sunpeng.li-5C7GfCeVMHo

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