Re: [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel

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Hi Greg:

Could this patch get a chance to be applied on stable kernel?
It only for 5.11- kernel, not for Linus' tree.

Thanks,
Aaron

On 5/20/21 12:27 AM, Lyude Paul wrote:
Seems reasonable to me:

Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>

On Wed, 2021-05-19 at 17:53 +0800, Aaron Ma wrote:
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@xxxxxxxxxxxxxxx # 5.11-
Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
---
  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





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