[PATCH 7/7][SRU][OEM-OSP1-B] USUNTU: SAUCE: drm/i915: Force DPCD backlight mode on Dell Precision 4K sku

[AceLan Kao]

BugLink: https://bugs.launchpad.net/bugs/1856134

This platform using DPCD aux to control backlight,
so adding the first 3 OUI bytes to the quirk.

Signed-off-by: AceLan Kao <acelan.kao at canonical.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 59f3aac38380..2a5e388c18b9 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1281,6 +1281,7 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
 	 * only supports DPCD backlight controls, despite advertising otherwise
 	 */
 	{ OUI(0xba, 0x41, 0x59), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_FORCE_DPCD_BACKLIGHT) },
+	{ OUI(0x38, 0xec, 0x11), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_FORCE_DPCD_BACKLIGHT) },
 };
 
 #undef OUI
-- 
2.17.1