drm/radeon/kms: add support for gui idle interrupts (v4)

Useful for certain power management operations.  You
need to wait for the GUI engine (2D, 3D, CP, etc.) to be
idle before changing clocks or adjusting engine parameters.

(v2) Fix gui idle enable on pre-r6xx asics

(v3) The gui idle interrrupt status bit is permanently asserted
on pre-r6xx chips, but the interrrupt is still generated.
workaround it in the driver.

(v4) Add support for evergreen

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

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index bb4a2a66f07..433937109af 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -376,6 +376,9 @@ struct radeon_irq {
         wait_queue_head_t       vblank_queue;
         /* FIXME: use defines for max hpd/dacs */
         bool            hpd[6];
+        bool            gui_idle;
+        bool            gui_idle_acked;
+        wait_queue_head_t       idle_queue;
         /* FIXME: use defines for max HDMI blocks */
         bool            hdmi[2];
         spinlock_t sw_lock;
@@ -694,6 +697,7 @@ struct radeon_pm {
         int                     active_crtcs;
         int                     req_vblank;
         bool                    vblank_sync;
+        bool                    gui_idle;
         fixed20_12              max_bandwidth;
         fixed20_12              igp_sideport_mclk;
         fixed20_12              igp_system_mclk;