linux-kernel - Re: [PATCH 10/36] ARM: s5pv210: use private pm save/restore

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Message-ID: <20191023115544.GA11048@pi3>
Date:   Wed, 23 Oct 2019 13:55:44 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linus.walleij@...aro.org,
        Tomasz Figa <tomasz.figa@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/36] ARM: s5pv210: use private pm save/restore

On Thu, Oct 10, 2019 at 10:29:54PM +0200, Arnd Bergmann wrote:
> The pm save/restore code is fairly small, so in order to
> separate the s3c and s5p platforms, adding an s5p specific
> copy instead of sharing it is actually easier.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-s5pv210/Makefile     |  7 -----
>  arch/arm/mach-s5pv210/pm.c         | 45 ++++++++++++++++++++++++++++--
>  arch/arm/mach-s5pv210/regs-clock.h |  2 +-
>  arch/arm/mach-s5pv210/s5pv210.c    |  2 --
>  arch/arm/plat-samsung/Makefile     |  4 +--
>  5 files changed, 45 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/arm/mach-s5pv210/Makefile b/arch/arm/mach-s5pv210/Makefile
> index e7b551e18e5c..aa0a1f091daf 100644
> --- a/arch/arm/mach-s5pv210/Makefile
> +++ b/arch/arm/mach-s5pv210/Makefile
> @@ -3,12 +3,5 @@
>  # Copyright (c) 2010 Samsung Electronics Co., Ltd.
>  # 		http://www.samsung.com/
>  
> -ccflags-$(CONFIG_ARCH_MULTIPLATFORM) += -I$(srctree)/arch/arm/plat-samsung/include
> -
> -# Core
> -
>  obj-$(CONFIG_PM_SLEEP)		+= pm.o sleep.o
> -
> -# machine support
> -
>  obj-y				+= s5pv210.o
> diff --git a/arch/arm/mach-s5pv210/pm.c b/arch/arm/mach-s5pv210/pm.c
> index efdb5a27c060..d59c094cdea8 100644
> --- a/arch/arm/mach-s5pv210/pm.c
> +++ b/arch/arm/mach-s5pv210/pm.c
> @@ -13,15 +13,56 @@
>  #include <linux/suspend.h>
>  #include <linux/syscore_ops.h>
>  #include <linux/io.h>
> +#include <linux/soc/samsung/s3c-pm.h>
>  
>  #include <asm/cacheflush.h>
>  #include <asm/suspend.h>
>  
> -#include <plat/pm-common.h>
> -
>  #include "common.h"
>  #include "regs-clock.h"
>  
> +/* helper functions to save and restore register state */
> +struct sleep_save {
> +	void __iomem	*reg;
> +	unsigned long	val;
> +};
> +
> +#define SAVE_ITEM(x) \
> +	{ .reg = (x) }
> +
> +/**
> + * s3c_pm_do_save() - save a set of registers for restoration on resume.
> + * @ptr: Pointer to an array of registers.
> + * @count: Size of the ptr array.
> + *
> + * Run through the list of registers given, saving their contents in the
> + * array for later restoration when we wakeup.
> + */
> +static void s3c_pm_do_save(struct sleep_save *ptr, int count)
> +{
> +	for (; count > 0; count--, ptr++) {
> +		ptr->val = readl_relaxed(ptr->reg);
> +		S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
> +	}
> +}
> +
> +/**
> + * s3c_pm_do_restore() - restore register values from the save list.
> + * @ptr: Pointer to an array of registers.
> + * @count: Size of the ptr array.
> + *
> + * Restore the register values saved from s3c_pm_do_save().
> + *
> + * WARNING: Do not put any debug in here that may effect memory or use
> + * peripherals, as things may be changing!
> +*/
> +
> +static void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
> +{
> +	for (; count > 0; count--, ptr++)
> +		writel_relaxed(ptr->val, ptr->reg);
> +}
> +
>  static struct sleep_save s5pv210_core_save[] = {
>  	/* Clock ETC */
>  	SAVE_ITEM(S5P_MDNIE_SEL),
> diff --git a/arch/arm/mach-s5pv210/regs-clock.h b/arch/arm/mach-s5pv210/regs-clock.h
> index 2a35c831a9b0..8c7530614e37 100644
> --- a/arch/arm/mach-s5pv210/regs-clock.h
> +++ b/arch/arm/mach-s5pv210/regs-clock.h
> @@ -9,7 +9,7 @@
>  #ifndef __ASM_ARCH_REGS_CLOCK_H
>  #define __ASM_ARCH_REGS_CLOCK_H __FILE__
>  
> -#include <plat/map-base.h>
> +#define S3C_VA_SYS		((void __iomem __force *)0xF6100000)

The same as for one of earlier patches - I prefer to keep the S3C_ADDR()
macro for consistency.

>  
>  #define S5P_CLKREG(x)		(S3C_VA_SYS + (x))
>  
> diff --git a/arch/arm/mach-s5pv210/s5pv210.c b/arch/arm/mach-s5pv210/s5pv210.c
> index 868f9c20419d..a21ed3bb992a 100644
> --- a/arch/arm/mach-s5pv210/s5pv210.c
> +++ b/arch/arm/mach-s5pv210/s5pv210.c
> @@ -13,8 +13,6 @@
>  #include <asm/mach/map.h>
>  #include <asm/system_misc.h>
>  
> -#include <plat/map-base.h>
> -
>  #include "common.h"
>  #include "regs-clock.h"
>  
> diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
> index d88b9b84f3a9..025ce22876c1 100644
> --- a/arch/arm/plat-samsung/Makefile
> +++ b/arch/arm/plat-samsung/Makefile
> @@ -24,9 +24,7 @@ obj-$(CONFIG_GPIO_SAMSUNG)     += gpio-samsung.o
>  
>  # PM support
>  
> -obj-$(CONFIG_PM_SLEEP)		+= pm-common.o
> -obj-$(CONFIG_EXYNOS_CPU_SUSPEND) += pm-common.o

CONFIG_EXYNOS_CPU_SUSPEND looks unrelated and seems to be not needed at
all. Can you remove it in separate patch?

Best regards,
Krzysztof


> -obj-$(CONFIG_SAMSUNG_PM)	+= pm.o
> +obj-$(CONFIG_SAMSUNG_PM)	+= pm.o pm-common.o
>  obj-$(CONFIG_SAMSUNG_PM_GPIO)	+= pm-gpio.o
>  
>  obj-$(CONFIG_SAMSUNG_WAKEMASK)	+= wakeup-mask.o
> -- 
> 2.20.0
>