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* [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel
@ 2021-05-19  9:53 Aaron Ma
  2021-05-19 16:27 ` Lyude Paul
  0 siblings, 1 reply; 5+ messages in thread
From: Aaron Ma @ 2021-05-19  9:53 UTC (permalink / raw)
  To: lyude, jani.nikula, airlied, maarten.lankhorst, mripard, daniel,
	dri-devel, linux-kernel, aaron.ma

Another Samsung 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.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3474
Cc: stable@vger.kernel.org # 5.11-
Signed-off-by: Aaron Ma <aaron.ma@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 5bd0934004e3..7b91d8a76cd6 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1960,6 +1960,7 @@ static const struct edid_quirk edid_quirk_list[] = {
 	{ 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) },
+	{ MFG(0x4c, 0x83), PROD_ID(0x57, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
 };
 
 #undef MFG
-- 
2.25.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-06-30  9:37 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-19  9:53 [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel Aaron Ma
2021-05-19 16:27 ` Lyude Paul
2021-06-30  4:29   ` Aaron Ma
2021-06-30  9:04     ` Greg KH
2021-06-30  9:37       ` [RESEND][PATCH] " Aaron Ma

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