1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 5e3f21861f45..b312b72d76ce 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -382,6 +382,9 @@ int rs600_irq_set(struct radeon_device *rdev)
         if (rdev->irq.sw_int) {
                 tmp |= S_000040_SW_INT_EN(1);
         }
+        if (rdev->irq.gui_idle) {
+                tmp |= S_000040_GUI_IDLE(1);
+        }
         if (rdev->irq.crtc_vblank_int[0]) {
                 mode_int |= S_006540_D1MODE_VBLANK_INT_MASK(1);
         }
@@ -404,9 +407,15 @@ int rs600_irq_set(struct radeon_device *rdev)
 static inline uint32_t rs600_irq_ack(struct radeon_device *rdev, u32 *r500_disp_int)
 {
         uint32_t irqs = RREG32(R_000044_GEN_INT_STATUS);
-        uint32_t irq_mask = ~C_000044_SW_INT;
+        uint32_t irq_mask = S_000044_SW_INT(1);
         u32 tmp;
 
+        /* the interrupt works, but the status bit is permanently asserted */
+        if (rdev->irq.gui_idle && radeon_gui_idle(rdev)) {
+                if (!rdev->irq.gui_idle_acked)
+                        irq_mask |= S_000044_GUI_IDLE_STAT(1);
+        }
+
         if (G_000044_DISPLAY_INT_STAT(irqs)) {
                 *r500_disp_int = RREG32(R_007EDC_DISP_INTERRUPT_STATUS);
                 if (G_007EDC_LB_D1_VBLANK_INTERRUPT(*r500_disp_int)) {
@@ -454,6 +463,9 @@ int rs600_irq_process(struct radeon_device *rdev)
         uint32_t r500_disp_int;
         bool queue_hotplug = false;
 
+        /* reset gui idle ack.  the status bit is broken */
+        rdev->irq.gui_idle_acked = false;
+
         status = rs600_irq_ack(rdev, &r500_disp_int);
         if (!status && !r500_disp_int) {
                 return IRQ_NONE;
@@ -462,6 +474,12 @@ int rs600_irq_process(struct radeon_device *rdev)
                 /* SW interrupt */
                 if (G_000044_SW_INT(status))
                         radeon_fence_process(rdev);
+                /* GUI idle */
+                if (G_000040_GUI_IDLE(status)) {
+                        rdev->irq.gui_idle_acked = true;
+                        rdev->pm.gui_idle = true;
+                        wake_up(&rdev->irq.idle_queue);
+                }
                 /* Vertical blank interrupts */
                 if (G_007EDC_LB_D1_VBLANK_INTERRUPT(r500_disp_int)) {
                         drm_handle_vblank(rdev->ddev, 0);
@@ -483,6 +501,8 @@ int rs600_irq_process(struct radeon_device *rdev)
                 }
                 status = rs600_irq_ack(rdev, &r500_disp_int);
         }
+        /* reset gui idle ack.  the status bit is broken */
+        rdev->irq.gui_idle_acked = false;
         if (queue_hotplug)
                 queue_work(rdev->wq, &rdev->hotplug_work);
         if (rdev->msi_enabled) {