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.c b/drivers/gpu/drm/msm/msm_gpu.c
index 0cfe3f4..3e667ca 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -154,9 +154,18 @@
int msm_gpu_pm_resume(struct msm_gpu *gpu)
{
+ struct drm_device *dev = gpu->dev;
int ret;
- DBG("%s", gpu->name);
+ DBG("%s: active_cnt=%d", gpu->name, gpu->active_cnt);
+
+ WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
+ if (gpu->active_cnt++ > 0)
+ return 0;
+
+ if (WARN_ON(gpu->active_cnt <= 0))
+ return -EINVAL;
ret = enable_pwrrail(gpu);
if (ret)
@@ -175,9 +184,18 @@
int msm_gpu_pm_suspend(struct msm_gpu *gpu)
{
+ struct drm_device *dev = gpu->dev;
int ret;
- DBG("%s", gpu->name);
+ DBG("%s: active_cnt=%d", gpu->name, gpu->active_cnt);
+
+ WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
+ if (--gpu->active_cnt > 0)
+ return 0;
+
+ if (WARN_ON(gpu->active_cnt < 0))
+ return -EINVAL;
ret = disable_axi(gpu);
if (ret)
@@ -195,6 +213,55 @@
}
/*
+ * Inactivity detection (for suspend):
+ */
+
+static void inactive_worker(struct work_struct *work)
+{
+ struct msm_gpu *gpu = container_of(work, struct msm_gpu, inactive_work);
+ struct drm_device *dev = gpu->dev;
+
+ if (gpu->inactive)
+ return;
+
+ DBG("%s: inactive!\n", gpu->name);
+ mutex_lock(&dev->struct_mutex);
+ if (!(msm_gpu_active(gpu) || gpu->inactive)) {
+ disable_axi(gpu);
+ disable_clk(gpu);
+ gpu->inactive = true;
+ }
+ mutex_unlock(&dev->struct_mutex);
+}
+
+static void inactive_handler(unsigned long data)
+{
+ struct msm_gpu *gpu = (struct msm_gpu *)data;
+ struct msm_drm_private *priv = gpu->dev->dev_private;
+
+ queue_work(priv->wq, &gpu->inactive_work);
+}
+
+/* cancel inactive timer and make sure we are awake: */
+static void inactive_cancel(struct msm_gpu *gpu)
+{
+ DBG("%s", gpu->name);
+ del_timer(&gpu->inactive_timer);
+ if (gpu->inactive) {
+ enable_clk(gpu);
+ enable_axi(gpu);
+ gpu->inactive = false;
+ }
+}
+
+static void inactive_start(struct msm_gpu *gpu)
+{
+ DBG("%s", gpu->name);
+ mod_timer(&gpu->inactive_timer,
+ round_jiffies_up(jiffies + DRM_MSM_INACTIVE_JIFFIES));
+}
+
+/*
* Hangcheck detection for locked gpu:
*/
@@ -206,7 +273,10 @@
dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
mutex_lock(&dev->struct_mutex);
- gpu->funcs->recover(gpu);
+ if (msm_gpu_active(gpu)) {
+ inactive_cancel(gpu);
+ gpu->funcs->recover(gpu);
+ }
mutex_unlock(&dev->struct_mutex);
msm_gpu_retire(gpu);
@@ -281,6 +351,9 @@
}
mutex_unlock(&dev->struct_mutex);
+
+ if (!msm_gpu_active(gpu))
+ inactive_start(gpu);
}
/* call from irq handler to schedule work to retire bo's */
@@ -302,6 +375,8 @@
gpu->submitted_fence = submit->fence;
+ inactive_cancel(gpu);
+
ret = gpu->funcs->submit(gpu, submit, ctx);
priv->lastctx = ctx;
@@ -357,11 +432,15 @@
gpu->dev = drm;
gpu->funcs = funcs;
gpu->name = name;
+ gpu->inactive = true;
INIT_LIST_HEAD(&gpu->active_list);
INIT_WORK(&gpu->retire_work, retire_worker);
+ INIT_WORK(&gpu->inactive_work, inactive_worker);
INIT_WORK(&gpu->recover_work, recover_worker);
+ setup_timer(&gpu->inactive_timer, inactive_handler,
+ (unsigned long)gpu);
setup_timer(&gpu->hangcheck_timer, hangcheck_handler,
(unsigned long)gpu);