linux-kernel - Re: [PATCH] pinctrl: mvebu: armada-38x: add suspend/resume support

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Message-ID: <20151017222927.GR32532@n2100.arm.linux.org.uk>
Date:	Sat, 17 Oct 2015 23:29:27 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org, thomas.petazzoni@...e-electrons.com,
	andrew@...n.ch, jason@...edaemon.net, tawfik@...vell.com,
	jaz@...ihalf.com, linus.walleij@...aro.org, nadavh@...vell.com,
	alior@...vell.com, gregory.clement@...e-electrons.com,
	sebastian.hesselbarth@...il.com
Subject: Re: [PATCH] pinctrl: mvebu: armada-38x: add suspend/resume support

On Sat, Oct 17, 2015 at 11:28:48PM +0200, Marcin Wojtas wrote:
> diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-38x.c b/drivers/pinctrl/mvebu/pinctrl-armada-38x.c
> index 6ec82c6..094cb48 100644
> --- a/drivers/pinctrl/mvebu/pinctrl-armada-38x.c
> +++ b/drivers/pinctrl/mvebu/pinctrl-armada-38x.c
> @@ -23,6 +23,7 @@
>  #include "pinctrl-mvebu.h"
>  
>  static void __iomem *mpp_base;
> +static u32 *mpp_saved_regs;

I'm not a fan of unnecessary global variables.  It adds to the bulk of
the kernel when built-in (even though it's in .bss, it still has a cost)
and these all add up when built-in.

Please make it part of the driver data allocated at probe time.

>  static int armada_38x_mpp_ctrl_get(unsigned pid, unsigned long *config)
>  {
> @@ -424,6 +425,7 @@ static int armada_38x_pinctrl_probe(struct platform_device *pdev)
>  	const struct of_device_id *match =
>  		of_match_device(armada_38x_pinctrl_of_match, &pdev->dev);
>  	struct resource *res;
> +	int nregs;
>  
>  	if (!match)
>  		return -ENODEV;
> @@ -441,11 +443,44 @@ static int armada_38x_pinctrl_probe(struct platform_device *pdev)
>  	soc->modes = armada_38x_mpp_modes;
>  	soc->nmodes = armada_38x_mpp_controls[0].npins;
>  
> +	nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
> +
> +	mpp_saved_regs = devm_kcalloc(&pdev->dev, nregs, sizeof(u32),
> +				      GFP_KERNEL);
> +	if (!mpp_saved_regs)
> +		return -ENOMEM;
> +
>  	pdev->dev.platform_data = soc;

The 'soc' is stored in platform data, not driver data, but...

>  
>  	return mvebu_pinctrl_probe(pdev);
>  }
>  
> +int armada_38x_pinctrl_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> +	struct mvebu_pinctrl_soc_info *soc = platform_get_drvdata(pdev);

You access it through driver data.  Isn't the driver data here a
struct mvebu_pinctrl pointer?  See platform_set_drvdata() in
mvebu_pinctrl_probe().

> +	int i, nregs;
> +
> +	nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
> +
> +	for (i = 0; i < nregs; i++)
> +		mpp_saved_regs[i] = readl(mpp_base + i * 4);
> +
> +	return 0;
> +}
> +
> +int armada_38x_pinctrl_resume(struct platform_device *pdev)
> +{
> +	struct mvebu_pinctrl_soc_info *soc = platform_get_drvdata(pdev);

Ditto.

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