linux-kernel - [PATCH v2] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

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Message-Id: <20251101040043.3768848-1-ajye_huang@compal.corp-partner.google.com>
Date: Sat,  1 Nov 2025 12:00:43 +0800
From: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
To: linux-kernel@...r.kernel.org
Cc: Douglas Anderson <dianders@...omium.org>,
	Jani Nikula <jani.nikula@...el.com>,
	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,
	Ajye Huang <ajye_huang@...pal.corp-partner.google.com>,
	jazhan@...gle.com
Subject: [PATCH v2] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

The Sharp LQ116M1JW105 reports that it supports 8 bpc modes,
but it will happen display noise in some videos.
So, limit it to 6 bpc modes.

Signed-off-by: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
---
changes from v1->v2:
* Change EDID_QUIRK_FORCE_6BPC to BIT(EDID_QUIRK_FORCE_6BPC)

 drivers/gpu/drm/drm_edid.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index e2e85345aa9a..26bb7710a462 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, BIT(EDID_QUIRK_FORCE_6BPC)),
+
 	/*
 	 * @drm_edid_internal_quirk entries end here, following with the
 	 * @drm_edid_quirk entries.
-- 
2.25.1