linux-kernel - [PATCH] drm/amd/display: Add MSF panel to DPCD 0x317 patch list

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Message-ID: <20240309014732.722139-1-tjakobi@math.uni-bielefeld.de>
Date: Sat,  9 Mar 2024 02:47:32 +0100
From: tjakobi@...h.uni-bielefeld.de
To: Harry Wentland <harry.wentland@....com>,
	Leo Li <sunpeng.li@....com>,
	Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	"Pan, Xinhui" <Xinhui.Pan@....com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>
Cc: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amd/display: Add MSF panel to DPCD 0x317 patch list

From: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>

This 8.4 inch panel is integrated in the Ayaneo Kun handheld
device. The panel resolution is 2560×1600, i.e. it has
portrait dimensions.

Decoding the EDID shows:
Manufacturer: MSF
Model: 4099
Display Product Name: 'TV080WUM-NL0 '

Judging from the product name this might be a clone of a
BOE panel, but with larger dimensions.

Panel frequently shows non-functional backlight control. Adding
some debug prints to update_connector_ext_caps() shows that
something the OLED bit of ext_caps is set, and then the driver
assumes that backlight is controlled via AUX.

Forcing backlight control to PWM via amdgpu.backlight=0 restores
backlight operation.

Signed-off-by: Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 7a09a72e182f..5a017ba94e3c 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -68,6 +68,7 @@ static void apply_edid_quirks(struct edid *edid, struct dc_edid_caps *edid_caps)
 	case drm_edid_encode_panel_id('A', 'U', 'O', 0xE69B):
 	case drm_edid_encode_panel_id('B', 'O', 'E', 0x092A):
 	case drm_edid_encode_panel_id('L', 'G', 'D', 0x06D1):
+	case drm_edid_encode_panel_id('M', 'S', 'F', 0x1003):
 		DRM_DEBUG_DRIVER("Clearing DPCD 0x317 on monitor with panel id %X\n", panel_id);
 		edid_caps->panel_patch.remove_sink_ext_caps = true;
 		break;
-- 
2.43.0