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From: Anson Jacob <Anson.Jacob@amd.com>
To: <amd-gfx@lists.freedesktop.org>
Cc: Eryk.Brol@amd.com, Sunpeng.Li@amd.com, Harry.Wentland@amd.com,
	Qingqing.Zhuo@amd.com, Rodrigo.Siqueira@amd.com,
	Taimur Hassan <syed.hassan@amd.com>,
	Wenjing Liu <Wenjing.Liu@amd.com>,
	Anson.Jacob@amd.com, Aurabindo.Pillai@amd.com,
	Bhawanpreet.Lakha@amd.com, bindu.r@amd.com
Subject: [PATCH 23/27] drm/amd/display: Workaround for some legacy DP-VGA dongles
Date: Fri, 29 Jan 2021 16:27:48 -0500	[thread overview]
Message-ID: <20210129212752.38865-24-Anson.Jacob@amd.com> (raw)
In-Reply-To: <20210129212752.38865-1-Anson.Jacob@amd.com>

From: Taimur Hassan <syed.hassan@amd.com>

[Why]
Maximum resolution is 1440*900 when connecting to FHD monitor via some DP-VGA
dongles. The display EDID reading fails over AUX/I2C via DP->VGA dongle, and
this leads to the maximum resolution 1920*1080 cannot be obtained from EDID.

[How]
Provide a workaround for some legacy DP-VGA dongles with a longer aux delay.

Signed-off-by: Taimur Hassan <syed.hassan@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
index 26f3d5dd0453..ae6484ab567b 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
@@ -39,12 +39,14 @@
 
 #define DC_LOGGER_INIT(logger)
 
-/*DP to Dual link DVI converter*/
+static const uint8_t DP_VGA_DONGLE_BRANCH_DEV_NAME[] = "DpVga";
+/* DP to Dual link DVI converter */
 static const uint8_t DP_DVI_CONVERTER_ID_4[] = "m2DVIa";
 static const uint8_t DP_DVI_CONVERTER_ID_5[] = "3393N2";
 
 #define AUX_POWER_UP_WA_DELAY 500
 #define I2C_OVER_AUX_DEFER_WA_DELAY 70
+#define DPVGA_DONGLE_AUX_DEFER_WA_DELAY 40
 #define I2C_OVER_AUX_DEFER_WA_DELAY_1MS 1
 
 /* CV smart dongle slave address for retrieving supported HDTV modes*/
@@ -292,6 +294,15 @@ static uint32_t defer_delay_converter_wa(
 {
 	struct dc_link *link = ddc->link;
 
+	if (link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER &&
+		link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_0080E1 &&
+		!memcmp(link->dpcd_caps.branch_dev_name,
+		    DP_VGA_DONGLE_BRANCH_DEV_NAME,
+			sizeof(link->dpcd_caps.branch_dev_name)))
+
+		return defer_delay > DPVGA_DONGLE_AUX_DEFER_WA_DELAY ?
+			defer_delay : DPVGA_DONGLE_AUX_DEFER_WA_DELAY;
+
 	if (link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_0080E1 &&
 	    !memcmp(link->dpcd_caps.branch_dev_name,
 		    DP_DVI_CONVERTER_ID_4,
-- 
2.25.1

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  parent reply	other threads:[~2021-01-29 21:28 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-29 21:27 [PATCH 00/27] DC Patches Jan 29, 2021 Anson Jacob
2021-01-29 21:27 ` [PATCH 01/27] drm/amd/display: Drop SOC bounding box hookup in DM/DC Anson Jacob
2021-01-29 21:27 ` [PATCH 02/27] drm/amd/display: Fix DPCD translation for LTTPR AUX_RD_INTERVAL Anson Jacob
2021-01-29 21:27 ` [PATCH 03/27] drm/amd/display: initialize i2c speed if not initialized in dcnxxx__resource.c Anson Jacob
2021-01-29 21:27 ` [PATCH 04/27] drm/amd/display: Add null pointer check to is_dig_enabled func Anson Jacob
2021-01-29 21:27 ` [PATCH 05/27] drm/amd/display: reuse current context instead of recreating one Anson Jacob
2021-02-10  2:57   ` youling257
2021-02-10  4:43     ` Alex Deucher
2021-02-10 13:48       ` youling 257
2021-01-29 21:27 ` [PATCH 06/27] drm/amd/display: Set power_gated to true for seamless boot pipe init Anson Jacob
2021-01-29 21:27 ` [PATCH 07/27] drm/amd/display: correct some hdcp variable naming Anson Jacob
2021-01-29 21:27 ` [PATCH 08/27] drm/amd/display: Add more Clock Sources to DCN2.1 Anson Jacob
2021-01-29 21:27 ` [PATCH 09/27] drm/amd/display: [FW Promotion] Release 0.0.49 Anson Jacob
2021-01-29 21:27 ` [PATCH 10/27] drm/amd/display: 3.2.120 Anson Jacob
2021-01-29 21:27 ` [PATCH 11/27] drm/amd/display: fix calculation for the pwl backlight curve Anson Jacob
2021-01-29 21:27 ` [PATCH 12/27] drm/amd/display: Revert "Fix EDID parsing after resume from suspend" Anson Jacob
2021-01-29 21:27 ` [PATCH 13/27] drm/amd/display: Release DSC before acquiring Anson Jacob
2021-01-29 21:27 ` [PATCH 14/27] drm/amd/display: Fix dc_sink kref count in emulated_link_detect Anson Jacob
2021-01-29 21:27 ` [PATCH 15/27] drm/amd/display: implement support for DID2.0 dsc passthrough Anson Jacob
2021-01-29 21:27 ` [PATCH 16/27] drm/amd/display: fix initial bounding box values for dcn3.02 Anson Jacob
2021-01-29 21:27 ` [PATCH 17/27] drm/amd/display: Fix CW4 programming for dmub30 cached inbox Anson Jacob
2021-01-29 21:27 ` [PATCH 18/27] drm/amd/display: Enable "trigger_hotplug" debugfs on all outputs Anson Jacob
2021-01-29 21:27 ` [PATCH 19/27] drm/amd/display: Add Freesync HDMI support to DMCU Anson Jacob
2021-01-29 21:27 ` [PATCH 20/27] drm/amd/display: remove unused force_ignore_link_settings debug option Anson Jacob
2021-01-29 21:27 ` [PATCH 21/27] drm/amd/display: Free atomic state after drm_atomic_commit Anson Jacob
2021-01-29 21:27 ` [PATCH 22/27] drm/amd/display: Decrement refcount of dc_sink before reassignment Anson Jacob
2021-01-29 21:27 ` Anson Jacob [this message]
2021-01-29 21:27 ` [PATCH 24/27] drm/amd/display: Better handling of dummy p-state table Anson Jacob
2021-01-29 21:27 ` [PATCH 25/27] drm/amd/display: Reject too small viewport size when validating plane Anson Jacob
2021-01-29 21:27 ` [PATCH 26/27] drm/amd/display: [FW Promotion] Release 0.0.50 Anson Jacob
2021-01-29 21:27 ` [PATCH 27/27] drm/amd/display: 3.2.121 Anson Jacob
2021-01-29 22:06 ` [PATCH 00/27] DC Patches Jan 29, 2021 Wheeler, Daniel

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