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drm/radeon: enable native backlight control on old macs 

Commit b7bc596ebb ("drm/radeon: disable native
backlight control on pre-r6xx asics (v2)") accidently
broke backlight control on old mac laptops that use the
on-GPU backlight controller.

Signed-off-by: Nathan-J. Hirschauer <nathanhi@deepserve.info>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Nathan-J. Hirschauer 2015-02-18 02:01:19 +01:00 committed by Alex Deucher
parent 5b49afd60a
commit 7a26f9ad1b
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/radeon_encoders.c
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@ -179,9 +179,12 @@ static void radeon_encoder_add_backlight(struct radeon_encoder *radeon_encoder,
(rdev->pdev->subsystem_vendor == 0x1734) &&
(rdev->pdev->subsystem_device == 0x1107))
use_bl = false;
/* Older PPC macs use on-GPU backlight controller */
#ifndef CONFIG_PPC_PMAC
/* disable native backlight control on older asics */
else if (rdev->family < CHIP_R600)
use_bl = false;
#endif
else
use_bl = true;
}