linux-kernel - [PATCH 3.19 144/177] drm/radeon: enable native backlight control on old macs

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Date:	Mon, 16 Mar 2015 15:09:11 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	"Nathan-J. Hirschauer" <nathanhi@...pserve.info>,
	Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 3.19 144/177] drm/radeon: enable native backlight control on old macs

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Nathan-J. Hirschauer" <nathanhi@...pserve.info>

commit 7a26f9ad1b5badfd0200ce2262ad696e2a6b7fbb upstream.

Commit b7bc596ebbe0 ("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@...pserve.info>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/radeon/radeon_encoders.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -179,9 +179,12 @@ static void radeon_encoder_add_backlight
 		    (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;
 	}


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