[PATCH] drm/radeon/kms/atom: set sane defaults in atombios_get_encoder_mode()

[Alex Deucher]

If there was no connector mapped to the encoder, atombios_get_encoder_mode()
returned 0 which is the id for DP.  Return something sane instead based on
the encoder id.  This avoids hitting the DP paths on non-DP encoders.

Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
Cc: stable at kernel.org
---
 drivers/gpu/drm/radeon/radeon_encoders.c |   18 +++++++++++++++---
 1 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c 
b/drivers/gpu/drm/radeon/radeon_encoders.c
index d55cb58..c6981df 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -595,6 +595,7 @@ atombios_digital_setup(struct drm_encoder *encoder, int 
action)
 int
 atombios_get_encoder_mode(struct drm_encoder *encoder)
 {
+       struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
        struct drm_device *dev = encoder->dev;
        struct radeon_device *rdev = dev->dev_private;
        struct drm_connector *connector;
@@ -602,9 +603,20 @@ atombios_get_encoder_mode(struct drm_encoder *encoder)
        struct radeon_connector_atom_dig *dig_connector;

        connector = radeon_get_connector_for_encoder(encoder);
-       if (!connector)
-               return 0;
-
+       if (!connector) {
+               switch (radeon_encoder->encoder_id) {
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY1:
+               case ENCODER_OBJECT_ID_INTERNAL_UNIPHY2:
+               case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_LVTMA:
+               case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DVO1:
+                       return ATOM_ENCODER_MODE_DVI;
+               case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DAC1:
+               case ENCODER_OBJECT_ID_INTERNAL_KLDSCP_DAC2:
+               default:
+                       return ATOM_ENCODER_MODE_CRT;
+               }
+       }
        radeon_connector = to_radeon_connector(connector);

        switch (connector->connector_type) {
-- 
1.7.1.1