Patchwork [v3,2/2] dmaengine: tegra210-adma: update system sleep callbacks

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Submitter Sameer Pujar
Date March 13, 2019, 11:32 a.m.
Message ID <1552476757-22360-2-git-send-email-spujar@nvidia.com>
Download mbox | patch
Permalink /patch/748079/
State New
Headers show

Comments

Sameer Pujar - March 13, 2019, 11:32 a.m.
If the driver is active till late suspend, where runtime PM cannot run,
force suspend is essential in such case to put the device in low power
state. Thus pm_runtime_force_suspend and pm_runtime_force_resume are
used as system sleep callbacks during system wide PM transitions.
Late system sleep callbacks are used to ensure, for instance, that the
sound core has suspended any on-going activity, including stopping the
ADMA if active, before we attempt to suspend the ADMA.

Suggested-by: Jonathan Hunter <jonathanh@nvidia.com>
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
---
 drivers/dma/tegra210-adma.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)
Jon Hunter - March 13, 2019, 12:11 p.m.
On 13/03/2019 11:32, Sameer Pujar wrote:
> If the driver is active till late suspend, where runtime PM cannot run,
> force suspend is essential in such case to put the device in low power
> state. Thus pm_runtime_force_suspend and pm_runtime_force_resume are
> used as system sleep callbacks during system wide PM transitions.
> Late system sleep callbacks are used to ensure, for instance, that the
> sound core has suspended any on-going activity, including stopping the
> ADMA if active, before we attempt to suspend the ADMA.
> 
> Suggested-by: Jonathan Hunter <jonathanh@nvidia.com>
> Signed-off-by: Sameer Pujar <spujar@nvidia.com>
> ---
>  drivers/dma/tegra210-adma.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
> index 650cd9c..253d312 100644
> --- a/drivers/dma/tegra210-adma.c
> +++ b/drivers/dma/tegra210-adma.c
> @@ -796,17 +796,11 @@ static int tegra_adma_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
> -static int tegra_adma_pm_suspend(struct device *dev)
> -{
> -	return pm_runtime_suspended(dev) == false;
> -}
> -#endif
> -
>  static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
>  	SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
>  			   tegra_adma_runtime_resume, NULL)
> -	SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
> +	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				     pm_runtime_force_resume)
>  };
>  
>  static struct platform_driver tegra_admac_driver = {

Acked-by: Jon Hunter <jonathanh@nvidia.com>

Cheers
Jon

Patch

diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index 650cd9c..253d312 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -796,17 +796,11 @@  static int tegra_adma_remove(struct platform_device *pdev)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int tegra_adma_pm_suspend(struct device *dev)
-{
-	return pm_runtime_suspended(dev) == false;
-}
-#endif
-
 static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
 	SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
 			   tegra_adma_runtime_resume, NULL)
-	SET_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
 };
 
 static struct platform_driver tegra_admac_driver = {