drm/radeon/kms: enable hpd support

This enabled interrupt driven hpd support for all
radeon chips.  Assuming the hpd pin is wired up
correctly, the driver will generate uevents on
digital monitor connect and disconnect and retrain
DP monitors automatically.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 6364ba1d4153..fd5ab01f6ad1 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -388,6 +388,7 @@ int rs600_irq_process(struct radeon_device *rdev)
 {
         uint32_t status, msi_rearm;
         uint32_t r500_disp_int;
+        bool queue_hotplug = false;
 
         status = rs600_irq_ack(rdev, &r500_disp_int);
         if (!status && !r500_disp_int) {
@@ -403,13 +404,17 @@ int rs600_irq_process(struct radeon_device *rdev)
                 if (G_007EDC_LB_D2_VBLANK_INTERRUPT(r500_disp_int))
                         drm_handle_vblank(rdev->ddev, 1);
                 if (G_007EDC_DC_HOT_PLUG_DETECT1_INTERRUPT(r500_disp_int)) {
-                        DRM_INFO("HPD1\n");
+                        queue_hotplug = true;
+                        DRM_DEBUG("HPD1\n");
                 }
                 if (G_007EDC_DC_HOT_PLUG_DETECT2_INTERRUPT(r500_disp_int)) {
-                        DRM_INFO("HPD2\n");
+                        queue_hotplug = true;
+                        DRM_DEBUG("HPD2\n");
                 }
                 status = rs600_irq_ack(rdev, &r500_disp_int);
         }
+        if (queue_hotplug)
+                queue_work(rdev->wq, &rdev->hotplug_work);
         if (rdev->msi_enabled) {
                 switch (rdev->family) {
                 case CHIP_RS600: