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

commit d3a67a43b0460bae3e2ac14092497833344ac10d upstream.

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>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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 3c91724457ca..7626bd501ffc 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1276,8 +1276,12 @@ 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);