drm/radeon/kms: disable the tv encoder when tv/cv is not in use

Switching between TV and VGA caused VGA to break on some systems
since the TV encoder was left enabled when VGA was used.

fixes fdo bug 25520.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 9f7f56a55f0a..30293bec0801 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1377,8 +1377,12 @@ radeon_atom_encoder_mode_set(struct drm_encoder *encoder,
         case ENCODER_OBJECT_ID_INTERNAL_DAC2:
         case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DAC2:
                 atombios_dac_setup(encoder, ATOM_ENABLE);
-                if (radeon_encoder->active_device & (ATOM_DEVICE_TV_SUPPORT | ATOM_DEVICE_CV_SUPPORT))
-                        atombios_tv_setup(encoder, ATOM_ENABLE);
+                if (radeon_encoder->devices & (ATOM_DEVICE_TV_SUPPORT | ATOM_DEVICE_CV_SUPPORT)) {
+                        if (radeon_encoder->active_device & (ATOM_DEVICE_TV_SUPPORT | ATOM_DEVICE_CV_SUPPORT))
+                                atombios_tv_setup(encoder, ATOM_ENABLE);
+                        else
+                                atombios_tv_setup(encoder, ATOM_DISABLE);
+                }
                 break;
         }
         atombios_apply_encoder_quirks(encoder, adjusted_mode);