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

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Date: Fri, 29 Mar 2024 16:07:59 +0100
From: Tobias Jakobi <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: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Add MSF panel to DPCD 0x317 patch list

On 3/9/24 02:47, tjakobi@...h.uni-bielefeld.de wrote:

> 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;
Gentle ping...