[PATCH 1/1] UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for BOE 2270 panel

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1904991

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 at canonical.com>
Signed-off-by: Lyude Paul <lyude at redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201009085750.88490-2-aaron.ma@canonical.com
(backported from commit 055f8458d95a38c20e8360634255f684378179eb
https://anongit.freedesktop.org/git/drm-intel.git)
Signed-off-by: Aaron Ma <aaron.ma 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 ce5ed08995b3..d0cf66115acf 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1471,6 +1471,7 @@ static const struct edid_quirk edid_quirk_list[] = {
 	 * PSR being enabled.
 	 */
 	{ MFG(0x0d, 0xae), PROD_ID(0x19, 0x15), BIT(DP_QUIRK_FORCE_PSR_CHIP_DEFAULT) },
+	{ MFG(0x09, 0xe5), PROD_ID(0xde, 0x08), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 };
 
 #undef MFG
-- 
2.28.0