linux-kernel - Re: [PATCH v3 1/2] Revert "mfd: sec-core: Prepare regulators for suspend state to reduce power-consumption"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 21 Oct 2014 08:41:52 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Mark Brown <broonie@...nel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] Revert
 "mfd: sec-core: Prepare regulators for suspend state to reduce
 power-consumption"

Hi Javier,

On 10/21/2014 06:05 AM, Javier Martinez Canillas wrote:
> This reverts commit b7cde7078d2344073c310aa65fc2b0a845d2cb5b
> ("mfd: sec-core: Prepare regulators for suspend state to reduce power-consumption")
> 
> Commit b7cde7078d23 called regulator_suspend_prepare() to prepare the
> regulators for a suspend state. But it did from the device pm suspend
> handler while the regulator suspend prepare function iterates over all
> regulators and not only the one managed by this device so it doesn't
> seems to be correct to call it from within a device driver.
> 
> It is better to call the regulator suspend prepare/finish functions
> from platform code instead so this patch reverts the mentioned commit.
> 
> Suggested-by: Doug Anderson <dianders@...omium.org>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> ---
>  drivers/mfd/Kconfig    |  1 -
>  drivers/mfd/sec-core.c | 10 ----------
>  2 files changed, 11 deletions(-)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 1456ea7..fd8cc4c 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -655,7 +655,6 @@ config MFD_SEC_CORE
>  	select MFD_CORE
>  	select REGMAP_I2C
>  	select REGMAP_IRQ
> -	select REGULATOR
>  	help
>  	 Support for the Samsung Electronics MFD series.
>  	 This driver provides common support for accessing the device,
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index dba7e2b..5993608 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -31,7 +31,6 @@
>  #include <linux/mfd/samsung/s2mpu02.h>
>  #include <linux/mfd/samsung/s5m8763.h>
>  #include <linux/mfd/samsung/s5m8767.h>
> -#include <linux/regulator/machine.h>
>  #include <linux/regmap.h>
>  
>  static const struct mfd_cell s5m8751_devs[] = {
> @@ -432,15 +431,6 @@ static int sec_pmic_suspend(struct device *dev)
>  	 */
>  	disable_irq(sec_pmic->irq);
>  
> -	switch (sec_pmic->device_type) {
> -	case S2MPS14X:
> -	case S2MPU02:
> -		regulator_suspend_prepare(PM_SUSPEND_MEM);
> -		break;
> -	default:
> -		break;
> -	}
> -
>  	return 0;
>  }
>  
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>

Thanks,
Chanwoo Choi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/