drm/radeon/kms: add support for encoder cloning.

The RN50 really needs this since its a single crtc card,
however other gpus may benefit from it as well.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 45 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 57a29f36115e..52e484fc75ff 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -35,6 +35,51 @@ extern int atom_debug;
 bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
                                 struct drm_display_mode *mode);
 
+static uint32_t radeon_encoder_clones(struct drm_encoder *encoder)
+{
+        struct drm_device *dev = encoder->dev;
+        struct radeon_device *rdev = dev->dev_private;
+        struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+        struct drm_encoder *clone_encoder;
+        uint32_t index_mask = 0;
+        int count;
+
+        /* DIG routing gets problematic */
+        if (rdev->family >= CHIP_R600)
+                return index_mask;
+        /* LVDS/TV are too wacky */
+        if (radeon_encoder->devices & ATOM_DEVICE_LCD_SUPPORT)
+                return index_mask;
+        /* DVO requires 2x ppll clocks depending on tmds chip */
+        if (radeon_encoder->devices & ATOM_DEVICE_DFP2_SUPPORT)
+                return index_mask;
+        
+        count = -1;
+        list_for_each_entry(clone_encoder, &dev->mode_config.encoder_list, head) {
+                struct radeon_encoder *radeon_clone = to_radeon_encoder(clone_encoder);
+                count++;
+
+                if (clone_encoder == encoder)
+                        continue;
+                if (radeon_clone->devices & (ATOM_DEVICE_LCD_SUPPORT))
+                        continue;
+                if (radeon_clone->devices & ATOM_DEVICE_DFP2_SUPPORT)
+                        continue;
+                else
+                        index_mask |= (1 << count);
+        }
+        return index_mask;
+}
+
+void radeon_setup_encoder_clones(struct drm_device *dev)
+{
+        struct drm_encoder *encoder;
+
+        list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+                encoder->possible_clones = radeon_encoder_clones(encoder);
+        }
+}
+
 uint32_t
 radeon_get_encoder_id(struct drm_device *dev, uint32_t supported_device, uint8_t dac)
 {
@@ -1341,7 +1386,6 @@ radeon_add_atom_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t su
                 encoder->possible_crtcs = 0x1;
         else
                 encoder->possible_crtcs = 0x3;
-        encoder->possible_clones = 0;
 
         radeon_encoder->enc_priv = NULL;