linux-kernel - Re: [PATCH v1 2/2] drm/panel-edp: Modify LQ116M1JW10 panel's bpc to 6

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Message-ID: <CALprXBb=_HuwskwFP0nRKH=3zwoGbig4fWY+Q4g53Jhn985TsA@mail.gmail.com>
Date: Thu, 30 Oct 2025 17:57:59 +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
Subject: Re: [PATCH v1 2/2] drm/panel-edp: Modify LQ116M1JW10 panel's bpc to 6

Hi Doug,

On Thu, Oct 30, 2025 at 7:25 AM Doug Anderson <dianders@...omium.org> wrote:

>
> Unless folks end up preferring EDID_QUIRK_FORCE_6BPC:
>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>

After following your suggestion with the following, the issue goes
away during YouTube playback.
I will send a new patch for drm_edid.c, thank you so much

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e2e85345aa9a..a73d37fe7ea1 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -250,6 +250,9 @@ static const struct edid_quirk {
     EDID_QUIRK('S', 'V', 'R', 0x1019, BIT(EDID_QUIRK_NON_DESKTOP)),
     EDID_QUIRK('A', 'U', 'O', 0x1111, BIT(EDID_QUIRK_NON_DESKTOP)),

+    /* LQ116M1JW10 displays noise when 8 bpc, but display fine as 6 bpc */
+    EDID_QUIRK('S', 'H', 'P', 0x154c, EDID_QUIRK_FORCE_6BPC),
+
     /*
      * @drm_edid_internal_quirk entries end here, following with the
      * @drm_edid_quirk entries.