linux-kernel - [PATCH] drm/i915: Force DPCD backlight mode for HP CML 2020 system

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Date:   Tue,  7 Apr 2020 15:53:53 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm/i915: Force DPCD backlight mode for HP CML 2020 system

There's another Samsung OLED panel needs to use DPCD aux interface to
control backlight.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c6fbe6e6bc9d..d0cfee3b7a65 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1299,6 +1299,8 @@ static const struct edid_quirk edid_quirk_list[] = {
 	 * only supports DPCD backlight controls
 	 */
 	{ MFG(0x4c, 0x83), PROD_ID(0x41, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
+	/* HP CML 2020 system */
+	{ MFG(0x4c, 0x83), PROD_ID(0x45, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 	/*
 	 * Some Dell CML 2020 systems have panels support both AUX and PWM
 	 * backlight control, and some only support AUX backlight control. All
-- 
2.17.1