drm/msm: crank down gpu when inactive
Shut down the clks when the gpu has nothing to do. A short inactivity
timer is used to provide a low pass filter for power transitions.
Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 458db8c..fad2700 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -72,6 +72,10 @@
uint32_t submitted_fence;
+ /* is gpu powered/active? */
+ int active_cnt;
+ bool inactive;
+
/* worker for handling active-list retiring: */
struct work_struct retire_work;
@@ -91,7 +95,12 @@
uint32_t bsc;
#endif
- /* Hang Detction: */
+ /* Hang and Inactivity Detection:
+ */
+#define DRM_MSM_INACTIVE_PERIOD 66 /* in ms (roughly four frames) */
+#define DRM_MSM_INACTIVE_JIFFIES msecs_to_jiffies(DRM_MSM_INACTIVE_PERIOD)
+ struct timer_list inactive_timer;
+ struct work_struct inactive_work;
#define DRM_MSM_HANGCHECK_PERIOD 500 /* in ms */
#define DRM_MSM_HANGCHECK_JIFFIES msecs_to_jiffies(DRM_MSM_HANGCHECK_PERIOD)
struct timer_list hangcheck_timer;
@@ -99,6 +108,11 @@
struct work_struct recover_work;
};
+static inline bool msm_gpu_active(struct msm_gpu *gpu)
+{
+ return gpu->submitted_fence > gpu->funcs->last_fence(gpu);
+}
+
static inline void gpu_write(struct msm_gpu *gpu, u32 reg, u32 data)
{
msm_writel(data, gpu->mmio + (reg << 2));