drm/nouveau: fix backlight mask on ppc powerbook

This code was originally moved to using nv_mask by d31e078d84. This
should not have any actual effect since the mask isn't applied to the
value.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/dispnv04/dfp.c b/drivers/gpu/drm/nouveau/dispnv04/dfp.c
index 59d1c040b84f..bb6c3c3f981d 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/dfp.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/dfp.c
@@ -493,7 +493,7 @@ static void nv04_dfp_update_backlight(struct drm_encoder *encoder, int mode)
         if (dev->pdev->device == 0x0174 || dev->pdev->device == 0x0179 ||
             dev->pdev->device == 0x0189 || dev->pdev->device == 0x0329) {
                 if (mode == DRM_MODE_DPMS_ON) {
-                        nv_mask(device, NV_PBUS_DEBUG_DUALHEAD_CTL, 0, 1 << 31);
+                        nv_mask(device, NV_PBUS_DEBUG_DUALHEAD_CTL, 1 << 31, 1 << 31);
                         nv_mask(device, NV_PCRTC_GPIO_EXT, 3, 1);
                 } else {
                         nv_mask(device, NV_PBUS_DEBUG_DUALHEAD_CTL, 1 << 31, 0);