linux-kernel - Re: [PATCH v3 3/3] soc: loongson2_pm: add power management support

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Date:   Thu, 15 Jun 2023 19:15:31 +0800
From:   zhuyinbo <zhuyinbo@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, Marc Zyngier <maz@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        loongarch@...ts.linux.dev, Jianmin Lv <lvjianmin@...ngson.cn>,
        wanghongliang@...ngson.cn, Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn, zhuyinbo@...ngson.cn
Subject: Re: [PATCH v3 3/3] soc: loongson2_pm: add power management support



在 2023/6/15 下午6:00, Huacai Chen 写道:

>> +static void loongson2_pm_status_clear(void)
>> +{
>> +       u16 value;
>> +
>> +       value = loongson2_pm_readw(LOONGSON2_PM1_STS_REG);
>> +       value |= (LOONGSON2_PM1_PWRBTN_STS | LOONGSON2_PM1_PCIEXP_WAKE_STS |
>> +                 LOONGSON2_PM1_WAKE_STS);
>> +       loongson2_pm_writew(value, LOONGSON2_PM1_STS_REG);
>> +       loongson2_pm_writel(loongson2_pm_readl(LOONGSON2_GPE0_STS_REG),
>> +                           LOONGSON2_GPE0_STS_REG);
> Long-line warnings is removed in latest kernel, so you don't need to split here.


okay, I got it.

> 
>> +}
>> +
>> +static void loongson2_power_button_irq_enable(void)
> 
> Using loongson2_pm_irq_enable is a little better.


Indeed, this looks better!  I will use it.

...

>> +static int loongson2_suspend_valid_state(suspend_state_t state)
>> +{
>> +       if (state == PM_SUSPEND_MEM)
>> +               return 1;
>> +
>> +       return 0;
> "return (state == PM_SUSPEND_MEM)" is enough.


okay, I got it.


Thanks,
Yinbo