linux-kernel - Re: [PATCH V6 02/21] pinctrl: tegra: Add suspend and resume support

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Date:   Mon, 22 Jul 2019 01:09:08 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com,
        linus.walleij@...aro.org, stefan@...er.ch, mark.rutland@....com
Cc:     pdeschrijver@...dia.com, pgaikwad@...dia.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org,
        jckuo@...dia.com, josephl@...dia.com, talho@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        mperttunen@...dia.com, spatra@...dia.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH V6 02/21] pinctrl: tegra: Add suspend and resume support

22.07.2019 1:03, Dmitry Osipenko пишет:
> 21.07.2019 22:40, Sowjanya Komatineni пишет:
>> This patch adds support for Tegra pinctrl driver suspend and resume.
>>
>> During suspend, context of all pinctrl registers are stored and
>> on resume they are all restored to have all the pinmux and pad
>> configuration for normal operation.
>>
>> Acked-by: Thierry Reding <treding@...dia.com>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>> ---
>>  drivers/pinctrl/tegra/pinctrl-tegra.c | 59 +++++++++++++++++++++++++++++++++++
>>  drivers/pinctrl/tegra/pinctrl-tegra.h |  3 ++
>>  2 files changed, 62 insertions(+)
>>
>> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
>> index 186ef98e7b2b..e3a237534281 100644
>> --- a/drivers/pinctrl/tegra/pinctrl-tegra.c
>> +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
>> @@ -631,6 +631,58 @@ static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
>>  	}
>>  }
>>  
>> +static size_t tegra_pinctrl_get_bank_size(struct device *dev,
>> +					  unsigned int bank_id)
>> +{
>> +	struct platform_device *pdev = to_platform_device(dev);
>> +	struct resource *res;
>> +
>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, bank_id);
>> +
>> +	return resource_size(res) / 4;
>> +}
>> +
>> +static int tegra_pinctrl_suspend(struct device *dev)
>> +{
>> +	struct tegra_pmx *pmx = dev_get_drvdata(dev);
>> +	u32 *backup_regs = pmx->backup_regs;
>> +	u32 *regs;
>> +	size_t bank_size;
>> +	unsigned int i, k;
>> +
>> +	for (i = 0; i < pmx->nbanks; i++) {
>> +		bank_size = tegra_pinctrl_get_bank_size(dev, i);
>> +		regs = pmx->regs[i];
>> +		for (k = 0; k < bank_size; k++)
>> +			*backup_regs++ = readl_relaxed(regs++);
>> +	}
>> +
>> +	return pinctrl_force_sleep(pmx->pctl);
>> +}
>> +
>> +static int tegra_pinctrl_resume(struct device *dev)
>> +{
>> +	struct tegra_pmx *pmx = dev_get_drvdata(dev);
>> +	u32 *backup_regs = pmx->backup_regs;
>> +	u32 *regs;
>> +	size_t bank_size;
>> +	unsigned int i, k;
>> +
>> +	for (i = 0; i < pmx->nbanks; i++) {
>> +		bank_size = tegra_pinctrl_get_bank_size(dev, i);
>> +		regs = pmx->regs[i];
>> +		for (k = 0; k < bank_size; k++)
>> +			writel_relaxed(*backup_regs++, regs++);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +const struct dev_pm_ops tegra_pinctrl_pm = {
>> +	.suspend = &tegra_pinctrl_suspend,
>> +	.resume = &tegra_pinctrl_resume
>> +};
>> +
>>  static bool gpio_node_has_range(const char *compatible)
>>  {
>>  	struct device_node *np;
>> @@ -655,6 +707,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
>>  	int i;
>>  	const char **group_pins;
>>  	int fn, gn, gfn;
>> +	unsigned long backup_regs_size = 0;
>>  
>>  	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
>>  	if (!pmx)
>> @@ -707,6 +760,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
>>  		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
>>  		if (!res)
>>  			break;
>> +		backup_regs_size += resource_size(res);
>>  	}
>>  	pmx->nbanks = i;
>>  
>> @@ -715,6 +769,11 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
>>  	if (!pmx->regs)
>>  		return -ENOMEM;
>>  
>> +	pmx->backup_regs = devm_kzalloc(&pdev->dev, backup_regs_size,
>> +					GFP_KERNEL);
>> +	if (!pmx->backup_regs)
>> +		return -ENOMEM;
>> +
>>  	for (i = 0; i < pmx->nbanks; i++) {
>>  		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
>>  		pmx->regs[i] = devm_ioremap_resource(&pdev->dev, res);
>> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.h b/drivers/pinctrl/tegra/pinctrl-tegra.h
>> index 105309774079..0fc82eea9cf1 100644
>> --- a/drivers/pinctrl/tegra/pinctrl-tegra.h
>> +++ b/drivers/pinctrl/tegra/pinctrl-tegra.h
>> @@ -17,6 +17,7 @@ struct tegra_pmx {
>>  
>>  	int nbanks;
>>  	void __iomem **regs;
>> +	u32 *backup_regs;
>>  };
>>  
>>  enum tegra_pinconf_param {
>> @@ -193,6 +194,8 @@ struct tegra_pinctrl_soc_data {
>>  	bool drvtype_in_mux;
>>  };
>>  
>> +extern const struct dev_pm_ops tegra_pinctrl_pm;
>> +
>>  int tegra_pinctrl_probe(struct platform_device *pdev,
>>  			const struct tegra_pinctrl_soc_data *soc_data);
>>  #endif
>>
> 
> Reviewed-by: Dmitry Osipenko <digetx@...il.com>
> 

BTW, you should remove Thierry's ACK from all patches that were modified
if he didn't re-ACK the new version.

Also, it looks to me that you're manually adding versioning to the
patches because git usually uses lowercase for 'v'. You could use "git
format-patch -v6 ..".