[PATCH] hwrng: mediatek - Force runtime pm ops for sleep ops

[PATCH] hwrng: mediatek - Force runtime pm ops for sleep ops

[Markus Schneider-Pargmann]

Currently mtk_rng_runtime_suspend/resume is called for both runtime pm
and system sleep operations.

This is wrong as these should only be runtime ops as the name already
suggests. Currently freezing the system will lead to a call to
mtk_rng_runtime_suspend even if the device currently isn't active. This
leads to a clock warning because it is disabled/unprepared although it
isn't enabled/prepared currently.

This patch fixes this by only setting the runtime pm ops and forces to
call the runtime pm ops from the system sleep ops as well if active but
not otherwise.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
---
 drivers/char/hw_random/mtk-rng.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c
index 8ad7b515a51b..6c00ea008555 100644
--- a/drivers/char/hw_random/mtk-rng.c
+++ b/drivers/char/hw_random/mtk-rng.c
@@ -166,8 +166,13 @@ static int mtk_rng_runtime_resume(struct device *dev)
 	return mtk_rng_init(&priv->rng);
 }
 
-static UNIVERSAL_DEV_PM_OPS(mtk_rng_pm_ops, mtk_rng_runtime_suspend,
-			    mtk_rng_runtime_resume, NULL);
+static const struct dev_pm_ops mtk_rng_pm_ops = {
+	SET_RUNTIME_PM_OPS(mtk_rng_runtime_suspend,
+			   mtk_rng_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
 #define MTK_RNG_PM_OPS (&mtk_rng_pm_ops)
 #else	/* CONFIG_PM */
 #define MTK_RNG_PM_OPS NULL
-- 
2.33.0


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Re: [PATCH] hwrng: mediatek - Force runtime pm ops for sleep ops

[Markus Schneider-Pargmann]

Hi,

On Thu, Sep 30, 2021 at 09:12:42PM +0200, Markus Schneider-Pargmann wrote:
> Currently mtk_rng_runtime_suspend/resume is called for both runtime pm
> and system sleep operations.
> 
> This is wrong as these should only be runtime ops as the name already
> suggests. Currently freezing the system will lead to a call to
> mtk_rng_runtime_suspend even if the device currently isn't active. This
> leads to a clock warning because it is disabled/unprepared although it
> isn't enabled/prepared currently.
> 
> This patch fixes this by only setting the runtime pm ops and forces to
> call the runtime pm ops from the system sleep ops as well if active but
> not otherwise.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>

Fixes: 81d2b34508c6 (hwrng: mtk - add runtime PM support)

Sorry, forgot to add this line in the commit message. I can add it for
the next version.

Best,
Markus

> ---
>  drivers/char/hw_random/mtk-rng.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c
> index 8ad7b515a51b..6c00ea008555 100644
> --- a/drivers/char/hw_random/mtk-rng.c
> +++ b/drivers/char/hw_random/mtk-rng.c
> @@ -166,8 +166,13 @@ static int mtk_rng_runtime_resume(struct device *dev)
>  	return mtk_rng_init(&priv->rng);
>  }
>  
> -static UNIVERSAL_DEV_PM_OPS(mtk_rng_pm_ops, mtk_rng_runtime_suspend,
> -			    mtk_rng_runtime_resume, NULL);
> +static const struct dev_pm_ops mtk_rng_pm_ops = {
> +	SET_RUNTIME_PM_OPS(mtk_rng_runtime_suspend,
> +			   mtk_rng_runtime_resume, NULL)
> +	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				pm_runtime_force_resume)
> +};
> +
>  #define MTK_RNG_PM_OPS (&mtk_rng_pm_ops)
>  #else	/* CONFIG_PM */
>  #define MTK_RNG_PM_OPS NULL
> -- 
> 2.33.0
> 

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Re: [PATCH] hwrng: mediatek - Force runtime pm ops for sleep ops

[Herbert Xu]

On Thu, Sep 30, 2021 at 09:12:42PM +0200, Markus Schneider-Pargmann wrote:
> Currently mtk_rng_runtime_suspend/resume is called for both runtime pm
> and system sleep operations.
> 
> This is wrong as these should only be runtime ops as the name already
> suggests. Currently freezing the system will lead to a call to
> mtk_rng_runtime_suspend even if the device currently isn't active. This
> leads to a clock warning because it is disabled/unprepared although it
> isn't enabled/prepared currently.
> 
> This patch fixes this by only setting the runtime pm ops and forces to
> call the runtime pm ops from the system sleep ops as well if active but
> not otherwise.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
> ---
>  drivers/char/hw_random/mtk-rng.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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