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drm/radeon: Fix backlight control on iMac 12,1

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commit 364438fd629f7611a84c8e6d7de91659300f1502 upstream.

The iMac 12,1 does not use the gmux driver for backlight, so the radeon
backlight device is needed to set the brightness.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1838
Signed-off-by: Nicholas Bishop <nicholasbishop@google.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicholas Bishop 2022-02-11 14:57:39 -05:00 committed by Greg Kroah-Hartman
parent 7e5db6d921
commit ae5340cdd6
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/radeon/atombios_encoders.c
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@ -192,7 +192,8 @@ void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,
* so don't register a backlight device
*/
if ((rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&
(rdev->pdev->device == 0x6741))
(rdev->pdev->device == 0x6741) &&
!dmi_match(DMI_PRODUCT_NAME, "iMac12,1"))
return;
if (!radeon_encoder->enc_priv)