drm/msm/gpu: use pm-runtime

We need to use pm-runtime properly when IOMMU is using device_link() to
control it's own clocks.

Signed-off-by: Rob Clark <robdclark@gmail.com>

2 files changed, 34 insertions, 13 deletions

diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
index ece39b1..bc170b7 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_device.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
@@ -155,21 +155,14 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 
 	if (gpu) {
 		int ret;
-		mutex_lock(&dev->struct_mutex);
-		gpu->funcs->pm_resume(gpu);
-		mutex_unlock(&dev->struct_mutex);
 
-		disable_irq(gpu->irq);
-
-		ret = gpu->funcs->hw_init(gpu);
+		pm_runtime_get_sync(&pdev->dev);
+		ret = msm_gpu_hw_init(gpu);
+		pm_runtime_put_sync(&pdev->dev);
 		if (ret) {
 			dev_err(dev->dev, "gpu hw init failed: %d\n", ret);
 			gpu->funcs->destroy(gpu);
 			gpu = NULL;
-		} else {
-			enable_irq(gpu->irq);
-			/* give inactive pm a chance to kick in: */
-			msm_gpu_retire(gpu);
 		}
 	}
 
@@ -296,12 +289,35 @@ static const struct of_device_id dt_match[] = {
 	{}
 };
 
+#ifdef CONFIG_PM
+static int adreno_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct msm_gpu *gpu = platform_get_drvdata(pdev);
+
+	return gpu->funcs->pm_resume(gpu);
+}
+
+static int adreno_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct msm_gpu *gpu = platform_get_drvdata(pdev);
+
+	return gpu->funcs->pm_suspend(gpu);
+}
+#endif
+
+static const struct dev_pm_ops adreno_pm_ops = {
+	SET_RUNTIME_PM_OPS(adreno_suspend, adreno_resume, NULL)
+};
+
 static struct platform_driver adreno_driver = {
 	.probe = adreno_probe,
 	.remove = adreno_remove,
 	.driver = {
 		.name = "adreno",
 		.of_match_table = dt_match,
+		.pm = &adreno_pm_ops,
 	},
 };
 
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 50e0f54..823f9df 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -115,6 +115,9 @@ void adreno_recover(struct msm_gpu *gpu)
 	struct drm_device *dev = gpu->dev;
 	int ret;
 
+	// XXX pm-runtime??  we *need* the device to be off after this
+	// so maybe continuing to call ->pm_suspend/resume() is better?
+
 	gpu->funcs->pm_suspend(gpu);
 
 	/* reset ringbuffer: */
@@ -127,13 +130,11 @@ void adreno_recover(struct msm_gpu *gpu)
 
 	gpu->funcs->pm_resume(gpu);
 
-	disable_irq(gpu->irq);
-	ret = gpu->funcs->hw_init(gpu);
+	ret = msm_gpu_hw_init(gpu);
 	if (ret) {
 		dev_err(dev->dev, "gpu hw init failed: %d\n", ret);
 		/* hmm, oh well? */
 	}
-	enable_irq(gpu->irq);
 }
 
 void adreno_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
@@ -365,6 +366,10 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	if (ret)
 		return ret;
 
+	pm_runtime_set_autosuspend_delay(&pdev->dev, DRM_MSM_INACTIVE_PERIOD);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
 	ret = request_firmware(&adreno_gpu->pm4, adreno_gpu->info->pm4fw, drm->dev);
 	if (ret) {
 		dev_err(drm->dev, "failed to load %s PM4 firmware: %d\n",