linux-kernel - Re: [PATCH v7 2/5] ARM: add AFTR mode support to firmware do

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Date:	Thu, 25 Sep 2014 18:16:03 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Thierry Reding <thierry.reding@...il.com>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Tomasz Figa <tomasz.figa@...il.com>,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linaro-kernel@...ts.linaro.org, linux-tegra@...r.kernel.org,
	Thierry Reding <treding@...dia.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v7 2/5] ARM: add AFTR mode support to firmware do_idle
 method

On 09/25/14 18:03, Thierry Reding wrote:
> On Thu, Sep 25, 2014 at 05:23:32PM +0900, Kukjin Kim wrote:
>> On 09/24/14 21:24, Bartlomiej Zolnierkiewicz wrote:
>>> On some platforms (i.e. EXYNOS ones) more than one idle mode is
>>> available and we need to distinguish them in firmware do_idle method.
>>>
>>> Add mode parameter to do_idle firmware method and AFTR mode support
>>> to EXYNOS do_idle implementation.
>>>
>>> This change is a preparation for adding secure firmware support to
>>> EXYNOS cpuidle driver.
>>>
>>> This patch shouldn't cause any functionality changes.
>>>
>>> Signed-off-by: Bartlomiej Zolnierkiewicz<b.zolnierkie@...sung.com>
>>> Acked-by: Kyungmin Park<kyungmin.park@...sung.com>
>>> ---
>>> v7:
>>> - fixed build on Tegra
>>> - updated summary line
>>>
>>>   arch/arm/include/asm/firmware.h        |  2 +-
>>>   arch/arm/mach-exynos/common.h          |  5 +++++
>>>   arch/arm/mach-exynos/firmware.c        | 10 ++++++++--
>>>   arch/arm/mach-tegra/cpuidle-tegra114.c |  2 +-
>>>   4 files changed, 15 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm/include/asm/firmware.h b/arch/arm/include/asm/firmware.h
>>> index 5904f59..89aefe1 100644
>>> --- a/arch/arm/include/asm/firmware.h
>>> +++ b/arch/arm/include/asm/firmware.h
>>> @@ -28,7 +28,7 @@ struct firmware_ops {
>>>   	/*
>>>   	 * Enters CPU idle mode
>>>   	 */
>>> -	int (*do_idle)(void);
>>> +	int (*do_idle)(unsigned long mode);
>>>   	/*
>>>   	 * Sets boot address of specified physical CPU
>>>   	 */
>>> diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
>>> index c218200..2d830df 100644
>>> --- a/arch/arm/mach-exynos/common.h
>>> +++ b/arch/arm/mach-exynos/common.h
>>> @@ -119,6 +119,11 @@ extern void __iomem *sysram_base_addr;
>>>   extern void __iomem *pmu_base_addr;
>>>   void exynos_sysram_init(void);
>>>
>>> +enum {
>>> +	FW_DO_IDLE_SLEEP,
>>> +	FW_DO_IDLE_AFTR,
>>> +};
>>> +
>>>   void exynos_firmware_init(void);
>>>
>>>   extern u32 exynos_get_eint_wake_mask(void);
>>> diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
>>> index f5e626d..e57b7c3 100644
>>> --- a/arch/arm/mach-exynos/firmware.c
>>> +++ b/arch/arm/mach-exynos/firmware.c
>>> @@ -28,9 +28,15 @@
>>>   #define EXYNOS_BOOT_ADDR	0x8
>>>   #define EXYNOS_BOOT_FLAG	0xc
>>>
>>> -static int exynos_do_idle(void)
>>> +static int exynos_do_idle(unsigned long mode)
>>>   {
>>> -	exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
>>> +	switch (mode) {
>>> +	case FW_DO_IDLE_AFTR:
>>> +		exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
>>> +		break;
>>> +	case FW_DO_IDLE_SLEEP:
>>> +		exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
>>> +	}
>>>   	return 0;
>>>   }
>>>
>>> diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
>>> index e3ebdce..425b6c8 100644
>>> --- a/arch/arm/mach-tegra/cpuidle-tegra114.c
>>> +++ b/arch/arm/mach-tegra/cpuidle-tegra114.c
>>> @@ -49,7 +49,7 @@ static int tegra114_idle_power_down(struct cpuidle_device *dev,
>>>   	call_firmware_op(prepare_idle);
>>>
>>>   	/* Do suspend by ourselves if the firmware does not implement it */
>>> -	if (call_firmware_op(do_idle) == -ENOSYS)
>>> +	if (call_firmware_op(do_idle, 0) == -ENOSYS)
>>>   		cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
>>>
>>>   	clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT,&dev->cpu);
>>
>> + Thierry(using nvidia.com e-mail address)
>>
>> Hi Thierry,
>>
>> For supporting AFTR mode in call_firmware_op(do_idle), need to modify tegra
>> stuff as you can see. The functionality will be same with before. Is it OK
>> to you? If you have no objection, I'd like to take this series into samsung
>> tree.
>
> I'm only aware of any devices using TrustedFirmware on Tegra, which is
> what the above code handles. The implementation for TrustedFirmware does
> not implement do_idle() (yet?) so I don't think this patch would cause
> any damage.
>
> Acked-by: Thierry Reding<treding@...dia.com>
>
Thanks, I've applied this whole series.

- Kukjin
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