drm/tegra: nvdec: Stop channel on suspend

CDMA must be stopped before hardware is suspended. Add channel stopping
to RPM suspend callback. Add system level suspend-resume callbacks.

Runtime PM initialization is moved to host1x client init phase because
RPM callback now uses host1x channel that is available only when host1x
client is registered.
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/nvdec.c

@@ -113,9 +113,13 @@ static int nvdec_init(struct host1x_client *client)
 		goto free_channel;
 	}
 
+	pm_runtime_enable(client->dev);
+	pm_runtime_use_autosuspend(client->dev);
+	pm_runtime_set_autosuspend_delay(client->dev, 500);
+
 	err = tegra_drm_register_client(tegra, drm);
 	if (err < 0)
-		goto free_syncpt;
+		goto disable_rpm;
 
 	/*
 	 * Inherit the DMA parameters (such as maximum segment size) from the
@@ -125,7 +129,10 @@ static int nvdec_init(struct host1x_client *client)
 
 	return 0;
 
-free_syncpt:
+disable_rpm:
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 free_channel:
 	host1x_channel_put(nvdec->channel);
@@ -150,10 +157,15 @@ static int nvdec_exit(struct host1x_client *client)
 	if (err < 0)
 		return err;
 
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 	host1x_channel_put(nvdec->channel);
 	host1x_client_iommu_detach(client);
 
+	nvdec->channel = NULL;
+
 	if (client->group) {
 		dma_unmap_single(nvdec->dev, nvdec->falcon.firmware.phys,
 				 nvdec->falcon.firmware.size, DMA_TO_DEVICE);
@@ -268,6 +280,8 @@ static __maybe_unused int nvdec_runtime_suspend(struct device *dev)
 {
 	struct nvdec *nvdec = dev_get_drvdata(dev);
 
+	host1x_channel_stop(nvdec->channel);
+
 	clk_disable_unprepare(nvdec->clk);
 
 	return 0;
@@ -412,10 +426,6 @@ static int nvdec_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
-	pm_runtime_enable(&pdev->dev);
-	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
-	pm_runtime_use_autosuspend(&pdev->dev);
-
 	return 0;
 
 exit_falcon:
@@ -436,11 +446,6 @@ static int nvdec_remove(struct platform_device *pdev)
 		return err;
 	}
 
-	if (pm_runtime_enabled(&pdev->dev))
-		pm_runtime_disable(&pdev->dev);
-	else
-		nvdec_runtime_suspend(&pdev->dev);
-
 	falcon_exit(&nvdec->falcon);
 
 	return 0;
@@ -448,6 +453,8 @@ static int nvdec_remove(struct platform_device *pdev)
 
 static const struct dev_pm_ops nvdec_pm_ops = {
 	SET_RUNTIME_PM_OPS(nvdec_runtime_suspend, nvdec_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 struct platform_driver tegra_nvdec_driver = {