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From: Aaron Ma <aaron.ma@canonical.com>
To: lyude@redhat.com, jani.nikula@intel.com, airlied@linux.ie,
	maarten.lankhorst@linux.intel.com, mripard@kernel.org,
	daniel@ffwll.ch, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, aaron.ma@canonical.com
Subject: [PATCH] drm/i915: Force DPCD backlight mode for Samsung 16727 panel
Date: Wed, 19 May 2021 17:53:05 +0800	[thread overview]
Message-ID: <20210519095305.47133-1-aaron.ma@canonical.com> (raw)

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


             reply	other threads:[~2021-05-19  9:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19  9:53 Aaron Ma [this message]
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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