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>

4 files changed, 48 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 5859109f924d..62b02372cb09 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -324,6 +324,7 @@ static bool radeon_setup_enc_conn(struct drm_device *dev)
                         ret = radeon_get_legacy_connector_info_from_table(dev);
         }
         if (ret) {
+                radeon_setup_encoder_clones(dev);
                 radeon_print_display_setup(dev);
                 list_for_each_entry(drm_connector, &dev->mode_config.connector_list, head)
                         radeon_ddc_dump(drm_connector);
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;
 
diff --git a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
index ae554bfa0548..36ac47672a3c 100644
--- a/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_legacy_encoders.c
@@ -1331,7 +1331,6 @@ radeon_add_legacy_encoder(struct drm_device *dev, uint32_t encoder_id, uint32_t
                 encoder->possible_crtcs = 0x1;
         else
                 encoder->possible_crtcs = 0x3;
-        encoder->possible_clones = 0;
 
         radeon_encoder->enc_priv = NULL;
 
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index d7a29ce19df8..5c25930d9bcf 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -377,6 +377,8 @@ extern void radeon_compute_pll(struct radeon_pll *pll,
                                uint32_t *post_div_p,
                                int flags);
 
+extern void radeon_setup_encoder_clones(struct drm_device *dev);
+
 struct drm_encoder *radeon_encoder_legacy_lvds_add(struct drm_device *dev, int bios_index);
 struct drm_encoder *radeon_encoder_legacy_primary_dac_add(struct drm_device *dev, int bios_index, int with_tv);
 struct drm_encoder *radeon_encoder_legacy_tv_dac_add(struct drm_device *dev, int bios_index, int with_tv);