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drm/msm: crank down gpu when inactive

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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>
This commit is contained in:
Rob Clark
2014-01-11 16:25:08 -05:00
parent 0963756fe5
commit 37d77c3ab5
4 changed files with 113 additions and 5 deletions
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16
drivers/gpu/drm/msm/msm_gpu.h
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@@ -72,6 +72,10 @@ struct msm_gpu {
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 @@ struct msm_gpu {
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 msm_gpu {
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));