drm/radeon/kms: Disable TV load detect on RS400,RC410,RS480

RS400,RC410,RS480 chipset seems to report a lot of false positive
with load detect on TV output. We haven't yet found a way to make
load detect reliable on those chipset, thus just disable it for TV
output. Would avoid user to experience phantom screen because X
believe there is a monitor connected to the TV output.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index fce4c4087fda..55fecfc1f197 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1149,6 +1149,13 @@ radeon_add_legacy_connector(struct drm_device *dev,
                         if (ret)
                                 goto failed;
                         radeon_connector->dac_load_detect = true;
+                        /* RS400,RC410,RS480 chipset seems to report a lot
+                         * of false positive on load detect, we haven't yet
+                         * found a way to make load detect reliable on those
+                         * chipset, thus just disable it for TV.
+                         */
+                        if (rdev->family == CHIP_RS400 || rdev->family == CHIP_RS480)
+                                radeon_connector->dac_load_detect = false;
                         drm_connector_attach_property(&radeon_connector->base,
                                                       rdev->mode_info.load_detect_property,
                                                       1);