linux-kernel - [PATCH 2/2] drm/i915: Force DPCD backlight mode for BOE 2270 panel

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Message-Id: <20201009085750.88490-2-aaron.ma@canonical.com>
Date:   Fri,  9 Oct 2020 16:57:50 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, aaron.ma@...onical.com,
        mapengyu@...il.com, daniel@...ll.ch, airlied@...ux.ie,
        tzimmermann@...e.de, mripard@...nel.org,
        maarten.lankhorst@...ux.intel.com, rodrigo.vivi@...el.com,
        joonas.lahtinen@...ux.intel.com, jani.nikula@...ux.intel.com,
        lyude@...hat.com, ville.syrjala@...ux.intel.com
Subject: [PATCH 2/2] drm/i915: Force DPCD backlight mode for BOE 2270 panel

BOE 2270 panel failed to control backlight brightness.
Add it in edid quirks to force using DPCD backlight control.
Then the brightness can be controlled.

Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 092c8c985911..417ed10bbf83 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1324,6 +1324,7 @@ static const struct edid_quirk edid_quirk_list[] = {
 	{ MFG(0x4d, 0x10), PROD_ID(0xc7, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4d, 0x10), PROD_ID(0xe6, 0x14), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	{ MFG(0x4c, 0x83), PROD_ID(0x47, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
+	{ MFG(0x09, 0xe5), PROD_ID(0xde, 0x08), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 };
 
 #undef MFG
-- 
2.25.1