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>

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 9f7f56a55f0a78b1732d0075fc4690afb5e5de0b..30293bec08013fae85ca294ff33c2c42dac3bfe8 100644 (file)
--- 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);