linux-kernel - Re: [PATCH 7/7] gpio: brcmstb: implement suspend/resume/shutdown

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Date:   Mon, 23 Oct 2017 16:06:39 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Gregory Fong <gregory.0xf0@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Brian Norris <computersforpeace@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        linux-gpio@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 7/7] gpio: brcmstb: implement suspend/resume/shutdown

On 10/20/2017 05:54 PM, Gregory Fong wrote:
> On Thu, Oct 19, 2017 at 11:39 AM, Doug Berger <opendmb@...il.com> wrote:
>>>> +static int brcmstb_gpio_resume(struct device *dev)
>>>> +{
>>>> +    struct brcmstb_gpio_priv *priv = dev_get_drvdata(dev);
>>>> +    struct brcmstb_gpio_bank *bank;
>>>> +    u32 wake_mask = 0;
>>>
>>> This isn't really being used as a mask, contrary to appearances.  It's
>>> just tracking whether any active IRQs were seen.  Please change to use a
>>> bool instead and adjust the name accordingly.
>>>
>>
>> I see your point, but I believe it is cleaner to use this to consolidate
>> the bit masks returned by each __brcmstb_gpio_get_active_irqs() call.
>> This allows a single test rather than a test per bank.
> 
> What about something like this?
> 
> bool need_wakeup_event = false;
> 
> list_for_each_entry(bank, &priv->bank_list, node) {
>         need_wakeup_event |= !!__brcmstb_gpio_get_active_irqs(bank);
>         brcmstb_gpio_bank_restore(priv, bank);
> }
> 
> if (priv->parent_wake_irq && need_wakeup_event)
>         pm_wakeup_event(dev, 0);
> 

It's less efficient, but it is not performance sensitive so if you feel
this is more understandable I'll make the change.

Thanks,
    Doug