linux-kernel - Re: [PATCH v1 1/2] drm/panel-edp: Add override bpc quirk for generic edp

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Message-ID: <CALprXBYk5YE+bwKToKPez=QGv=KeJOwAgpCFxjhxdg4vAGNquQ@mail.gmail.com>
Date: Thu, 30 Oct 2025 16:19:38 +0800
From: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
To: Doug Anderson <dianders@...omium.org>
Cc: linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <jesszhan0024@...il.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	dri-devel@...ts.freedesktop.org, jazhan@...gle.com, 
	Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v1 1/2] drm/panel-edp: Add override bpc quirk for generic edp

Hi Doug,

On Thu, Oct 30, 2025 at 7:21 AM Doug Anderson <dianders@...omium.org> wrote:

> At first I was thinking that the quirks in "drm_edid.c" were probably
> just for "DP" display, but then I just realized that they probably
> also are for "eDP" panels. Specifically I think Intel hardware doesn't
> use panel-edp.c so I think the only place quirks could get applied (if
> an eDP panel was also used on Intel hardware) was from "drm_edid.c".
>
> Any chance you could confirm if EDID_QUIRK_FORCE_6BPC works for you?

The following quirks added in drm_edid.c is workable,
+       /* Sharp LQ116M1JW10 reports 8 bpc and it  will display noise,
but display noiseless as 6 bpc  */
+       EDID_QUIRK('S', 'H', 'P', 0x154c, EDID_QUIRK_FORCE_6BPC),

I will send upstream a new patch for modifying the drm_edid.c , thank
you so much