drm/radeon/evergreen+: don't enable HPD interrupts on eDP/LVDS

commit 2e97be73e5f74a317232740ae82eb8f95326a660 upstream.

Avoids potential interrupt storms when the display is disabled.

May fix:
https://bugzilla.kernel.org/show_bug.cgi?id=56041

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 4078f25fad722dd4e655413ff3f64b8a449ea9c4..90dc470766206e14f606fdbdf44c86021fa0dba8 100644 (file)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -636,6 +636,16 @@ void evergreen_hpd_init(struct radeon_device *rdev)
 
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+
+               if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
+                   connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
+                       /* don't try to enable hpd on eDP or LVDS avoid breaking the
+                        * aux dp channel on imac and help (but not completely fix)
+                        * https://bugzilla.redhat.com/show_bug.cgi?id=726143
+                        * also avoid interrupt storms during dpms.
+                        */
+                       continue;
+               }
                switch (radeon_connector->hpd.hpd) {
                case RADEON_HPD_1:
                        WREG32(DC_HPD1_CONTROL, tmp);