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[1/1,SRU,G] UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Dell XPS 9510(TGL)

Message ID 20210625021328.936257-3-acelan.kao@canonical.com
State New
Headers show
Series [1/1,SRU,G] UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Dell XPS 9510(TGL) | expand

Commit Message

AceLan Kao June 25, 2021, 2:13 a.m. UTC 
From: "Chia-Lin Kao (AceLan)" <acelan.kao@canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1933566

DELL XPS 9510 OLED panel needs DPCD to get control of backlight.
Kernel 5.12+ support the backlight via:
commit: <4a8d79901d5b> ("drm/i915/dp: Enable Intel's HDR backlight interface (only SDR for now)")
Only make backlight work on lower versions of kernel.

Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c16057c253d5..6ba5afebb042 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1329,6 +1329,7 @@  static const struct edid_quirk edid_quirk_list[] = {
 	 */
 	{ 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) },
+	{ MFG(0x4c, 0x83), PROD_ID(0x4d, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 };
 
 #undef MFG