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>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 4078f25fad72..90dc47076620 100644
--- 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);