drm/amdgpu/dce10: disable hpd on local panels

Otherwise we can get a hotplug interrupt storm when
we turn the panel off if hpd interrupts were enabled
by the bios.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=97471

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index 9a63d77..55e346e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -427,16 +427,6 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
                struct amdgpu_connector *amdgpu_connector = to_amdgpu_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 (amdgpu_connector->hpd.hpd) {
                case AMDGPU_HPD_1:
                        idx = 0;
@@ -460,6 +450,19 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
                        continue;
                }
 
+               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.
+                        */
+                       tmp = RREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx]);
+                       tmp = REG_SET_FIELD(tmp, DC_HPD_INT_CONTROL, DC_HPD_INT_EN, 0);
+                       WREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx], tmp);
+                       continue;
+               }
+
                tmp = RREG32(mmDC_HPD_CONTROL + hpd_offsets[idx]);
                tmp = REG_SET_FIELD(tmp, DC_HPD_CONTROL, DC_HPD_EN, 1);
                WREG32(mmDC_HPD_CONTROL + hpd_offsets[idx], tmp);