drm/radeon: disable native backlight control on pre-r6xx asics (v2)

Just use the acpi interface.  That's what windows uses on this
generation and it's the only thing that seems to work reliably
on these generation parts.

You can still force the native backlight interface by setting
radeon.backlight=1

Bug:
https://bugzilla.kernel.org/show_bug.cgi?id=88501

v2: merge into above if/else block

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 9a19e52cc655bf8b3c697a7116e52e81b8060096..6b670b0bc47bb9dca0238ef35dcff1cc2f686c34 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -179,6 +179,9 @@ static void radeon_encoder_add_backlight(struct radeon_encoder *radeon_encoder,
                    (rdev->pdev->subsystem_vendor == 0x1734) &&
                    (rdev->pdev->subsystem_device == 0x1107))
                        use_bl = false;
+               /* disable native backlight control on older asics */
+               else if (rdev->family < CHIP_R600)
+                       use_bl = false;
                else
                        use_bl = true;
        }