Re: [PATCH v2] ARM: EXYNOS4: Support for generic I/O power domains on EXYNOS4210

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Hi,

Rafael J. Wysocki wrote:
> Hi,
> 
> On Monday, June 27, 2011, Chanwoo Choi wrote:
>> Use the generic power domains support to implement support for
>> power domain on EXYNOS4210.
>>
>> I refer to the following patch to implement what configure
>> the clock-gating control register for block to turn off/on:
>> http://git.infradead.org/users/kmpark/linux-2.6-samsung/commit/39a81876d034dcbdc2a4c4c4b847b3b49e38870c
>>
>> This patch is based on following "pm-domains" branch.
>> http://git.kernel.org/?p=linux/kernel/git/rafael/suspend-2.6.git;a=shortlog;h=refs/heads/pm-domains
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
>> Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
>> Signed-off-by: Kyungmin.park <kyungmin.park@xxxxxxxxxxx>
>> ---
>>  arch/arm/mach-exynos4/Kconfig                      |    1 +
>>  arch/arm/mach-exynos4/Makefile                     |    1 +
>>  arch/arm/mach-exynos4/include/mach/pm-exynos4210.h |   69 ++++++++
>>  arch/arm/mach-exynos4/include/mach/regs-clock.h    |    8 +
>>  arch/arm/mach-exynos4/mach-nuri.c                  |   20 +++
>>  arch/arm/mach-exynos4/pm-exynos4210.c              |  170 ++++++++++++++++++++
>>  arch/arm/plat-samsung/include/plat/pd.h            |    3 +-
>>  7 files changed, 271 insertions(+), 1 deletions(-)
>>  create mode 100644 arch/arm/mach-exynos4/include/mach/pm-exynos4210.h
>>  create mode 100644 arch/arm/mach-exynos4/pm-exynos4210.c
>>
>> diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
>> index 1435fc3..266e7f6 100644
>> --- a/arch/arm/mach-exynos4/Kconfig
>> +++ b/arch/arm/mach-exynos4/Kconfig
>> @@ -183,6 +183,7 @@ config MACH_NURI
>>  	select EXYNOS4_SETUP_SDHCI
>>  	select EXYNOS4_SETUP_USB_PHY
>>  	select SAMSUNG_DEV_PWM
>> +	select PM_GENERIC_DOMAINS
> 
> That should be "select PM_GENERIC_DOMAINS if PM".  Otherwise it will be
> selected even for CONFIG_PM unset.

OK, I will modify it.

> 
>>  	help
>>  	  Machine support for Samsung Mobile NURI Board.
>>  
>> diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile
>> index 60fe5ec..0e9461f 100644
>> --- a/arch/arm/mach-exynos4/Makefile
>> +++ b/arch/arm/mach-exynos4/Makefile
>> @@ -17,6 +17,7 @@ obj-$(CONFIG_CPU_EXYNOS4210)	+= setup-i2c0.o irq-eint.o dma.o
>>  obj-$(CONFIG_PM)		+= pm.o sleep.o
>>  obj-$(CONFIG_CPU_FREQ)		+= cpufreq.o
>>  obj-$(CONFIG_CPU_IDLE)		+= cpuidle.o
>> +obj-$(CONFIG_CPU_EXYNOS4210)	+= pm-exynos4210.o
>>  
>>  obj-$(CONFIG_SMP)		+= platsmp.o headsmp.o
>>  
>> diff --git a/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h b/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h
>> new file mode 100644
>> index 0000000..ff924a8
>> --- /dev/null
>> +++ b/arch/arm/mach-exynos4/include/mach/pm-exynos4210.h
>> @@ -0,0 +1,69 @@
>> +/* linux/arch/arm/mach-exynos4/include/mach/pm-exynos4.h
>> + *
>> + * Exynos4 Power management support
>> + *
>> + * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
>> + *		http://www.samsung.com
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef __PM_EXYNOS4210_H__
>> +#define __PM_EXYNOS4210_H__
>> +
>> +#include <linux/pm_domain.h>
>> +#include <plat/pd.h>
>> +
>> +struct platform_device;
>> +
>> +struct exynos4210_pm_domain {
>> +	struct generic_pm_domain genpd;
>> +
>> +	const char *name;
>> +	void __iomem *base;
>> +	unsigned long gate_mask;
>> +	int boot_on;
>> +};
>> +
>> +static inline struct exynos4210_pm_domain *to_exynos4210_pd(
>> +		struct generic_pm_domain *pd)
>> +{
>> +	return container_of(pd, struct exynos4210_pm_domain, genpd);
>> +}
>> +
>> +#ifdef CONFIG_PM
>> +extern struct exynos4210_pm_domain exynos4210_pd_list[PD_MAX_NUM];
>> +#define EXYNOS4210_MFC		(&exynos4210_pd_list[PD_MFC])
>> +#define EXYNOS4210_G3D		(&exynos4210_pd_list[PD_G3D])
>> +#define EXYNOS4210_LCD0		(&exynos4210_pd_list[PD_LCD0])
>> +#define EXYNOS4210_LCD1		(&exynos4210_pd_list[PD_LCD1])
>> +#define EXYNOS4210_TV		(&exynos4210_pd_list[PD_TV])
>> +#define EXYNOS4210_CAM		(&exynos4210_pd_list[PD_CAM])
>> +#define EXYNOS4210_GPS		(&exynos4210_pd_list[PD_GPS])
>> +
>> +int exynos4210_pd_init(struct exynos4210_pm_domain *domain);
>> +int exynos4210_add_device_to_domain(struct exynos4210_pm_domain *domain,
>> +				struct platform_device *pdev);
>> +#else
>> +#define EXYNOS4210_MFC		NULL
>> +#define EXYNOS4210_G3D		NULL
>> +#define EXYNOS4210_LCD0		NULL
>> +#define EXYNOS4210_LCD1		NULL
>> +#define EXYNOS4210_TV		NULL
>> +#define EXYNOS4210_CAM		NULL
>> +#define EXYNOS4210_GPS		NULL
>> +
>> +static inline int exynos4210_pd_init(struct exynos4210_pm_domain *domain)
>> +{
>> +	return 0;
>> +}
>> +static inline int exynos4_add_device_to_domain(struct exynos4210_pm_domain *domain,
>> +				struct platform_device *pdev)
>> +{
>> +	return 0;
>> +}
>> +#endif /* CONFIG_PM */
>> +
>> +#endif /* __PM_EXYNOS4210_H__ */
>> diff --git a/arch/arm/mach-exynos4/include/mach/regs-clock.h b/arch/arm/mach-exynos4/include/mach/regs-clock.h
>> index 6e311c1..bc0fda9 100644
>> --- a/arch/arm/mach-exynos4/include/mach/regs-clock.h
>> +++ b/arch/arm/mach-exynos4/include/mach/regs-clock.h
>> @@ -171,6 +171,14 @@
>>  #define S5P_CLKDIV_BUS_GPLR_SHIFT	(4)
>>  #define S5P_CLKDIV_BUS_GPLR_MASK	(0x7 << S5P_CLKDIV_BUS_GPLR_SHIFT)
>>  
>> +#define S5P_CLKGATE_BLOCK_CAM		(1<<0)
>> +#define S5P_CLKGATE_BLOCK_TV		(1<<1)
>> +#define S5P_CLKGATE_BLOCK_MFC		(1<<2)
>> +#define S5P_CLKGATE_BLOCK_G3D		(1<<3)
>> +#define S5P_CLKGATE_BLOCK_LCD0		(1<<4)
>> +#define S5P_CLKGATE_BLOCK_LCD1		(1<<5)
>> +#define S5P_CLKGATE_BLOCK_GPS		(1<<7)
>> +
>>  /* Compatibility defines and inclusion */
>>  
>>  #include <mach/regs-pmu.h>
>> diff --git a/arch/arm/mach-exynos4/mach-nuri.c b/arch/arm/mach-exynos4/mach-nuri.c
>> index 642702b..805c6d5 100644
>> --- a/arch/arm/mach-exynos4/mach-nuri.c
>> +++ b/arch/arm/mach-exynos4/mach-nuri.c
>> @@ -37,6 +37,7 @@
>>  #include <plat/iic.h>
>>  
>>  #include <mach/map.h>
>> +#include <mach/pm-exynos4210.h>
>>  
>>  /* Following are default values for UCON, ULCON and UFCON UART registers */
>>  #define NURI_UCON_DEFAULT	(S3C2410_UCON_TXILEVEL |	\
>> @@ -376,6 +377,23 @@ static struct platform_device *nuri_devices[] __initdata = {
>>  	&nuri_backlight_device,
>>  };
>>  
>> +static void __init nuri_power_domain_init(void)
>> +{
>> +	int i;
>> +
>> +	for (i = 0 ; i < PD_MAX_NUM ; i++)
>> +		exynos4210_pd_init(&exynos4210_pd_list[i]);
>> +
>> +	/* Add device to power-domain */
>> +	exynos4210_add_device_to_domain(EXYNOS4210_MFC, NULL);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_G3D, NULL);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_LCD0, &nuri_lcd_device);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_LCD1, NULL);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_TV, NULL);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_CAM, NULL);
>> +	exynos4210_add_device_to_domain(EXYNOS4210_GPS, NULL);
> 
> It seems the calls with the second NULL argument are redundant.
> 
I will fix it.

> The rest looks OK to me.
> 
> Thanks,
> Rafael
> 

I will resend the modified patch according to your comment and your "pm-domains" branch.

Thanks,
Chanwoo Choi

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