drm/radeon/kms: refine TMDS dual link checks
HDMI 1.3 defines single link clocks up to 340 Mhz.
Refine the current dual link checks to only enable
dual link for DVI > 165 Mhz or HDMI > 340 Mhz if the
hw supports HDMI 1.3 (DCE3+).
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=44755
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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 4b27efa..9419c51 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -202,6 +202,22 @@
return NULL;
}
+struct drm_connector *
+radeon_get_connector_for_encoder_init(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
+ struct drm_connector *connector;
+ struct radeon_connector *radeon_connector;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ radeon_connector = to_radeon_connector(connector);
+ if (radeon_encoder->devices & radeon_connector->devices)
+ return connector;
+ }
+ return NULL;
+}
+
struct drm_encoder *radeon_get_external_encoder(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
@@ -288,3 +304,64 @@
}
+bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
+ u32 pixel_clock)
+{
+ struct drm_device *dev = encoder->dev;
+ struct radeon_device *rdev = dev->dev_private;
+ struct drm_connector *connector;
+ struct radeon_connector *radeon_connector;
+ struct radeon_connector_atom_dig *dig_connector;
+
+ connector = radeon_get_connector_for_encoder(encoder);
+ /* if we don't have an active device yet, just use one of
+ * the connectors tied to the encoder.
+ */
+ if (!connector)
+ connector = radeon_get_connector_for_encoder_init(encoder);
+ radeon_connector = to_radeon_connector(connector);
+
+ switch (connector->connector_type) {
+ case DRM_MODE_CONNECTOR_DVII:
+ case DRM_MODE_CONNECTOR_HDMIB:
+ if (radeon_connector->use_digital) {
+ /* HDMI 1.3 supports up to 340 Mhz over single link */
+ if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+ if (pixel_clock > 340000)
+ return true;
+ else
+ return false;
+ } else {
+ if (pixel_clock > 165000)
+ return true;
+ else
+ return false;
+ }
+ } else
+ return false;
+ case DRM_MODE_CONNECTOR_DVID:
+ case DRM_MODE_CONNECTOR_HDMIA:
+ case DRM_MODE_CONNECTOR_DisplayPort:
+ dig_connector = radeon_connector->con_priv;
+ if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
+ (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP))
+ return false;
+ else {
+ /* HDMI 1.3 supports up to 340 Mhz over single link */
+ if (ASIC_IS_DCE3(rdev) && drm_detect_hdmi_monitor(radeon_connector->edid)) {
+ if (pixel_clock > 340000)
+ return true;
+ else
+ return false;
+ } else {
+ if (pixel_clock > 165000)
+ return true;
+ else
+ return false;
+ }
+ }
+ default:
+ return false;
+ }
+}
+