[PATCH v14 15/39] drm/tegra: nvdec: Stop channel on suspend

Dmitry Osipenko
2021-10-25T22:47:03Z

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.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/gpu/drm/tegra/nvdec.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/tegra/nvdec.c b/drivers/gpu/drm/tegra/nvdec.c
index 48c90e26e90a..0f1146be9d6d 100644
--- a/drivers/gpu/drm/tegra/nvdec.c
+++ b/drivers/gpu/drm/tegra/nvdec.c
@@ -112,9 +112,13 @@ 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
@@ -124,7 +128,10 @@ 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);
@@ -149,10 +156,15 @@ 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);
@@ -267,6 +279,8 @@ static 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;
@@ -411,10 +425,6 @@ 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:
@@ -435,11 +445,6 @@ 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;
@@ -447,6 +452,8 @@ 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 = {
--
2.33.1