linux-kernel - Re: [PATCH v1] i2c: tegra: Compile PM functions unconditionally

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Date:   Wed, 10 Jul 2019 00:03:58 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] i2c: tegra: Compile PM functions unconditionally

09.07.2019 13:12, Jon Hunter пишет:
> 
> On 08/07/2019 00:12, Dmitry Osipenko wrote:
>> The I2C driver fails to probe if CONFIG_PM_SLEEP=n because runtime PM
>> doesn't depend on the PM sleep and in this case the runtime PM ops are
>> not included in the driver, resulting in I2C clock not being enabled.
>> It's much cleaner to simply allow compiler to remove the dead code
>> instead of messing with the #ifdefs.
>>
>> This patch fixes such errors when CONFIG_PM_SLEEP=n:
>>
>>   tegra-i2c 7000c400.i2c: timeout waiting for fifo flush
>>   tegra-i2c 7000c400.i2c: Failed to initialize i2c controller
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/i2c/busses/i2c-tegra.c | 16 +++++-----------
>>  1 file changed, 5 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
>> index 9fcb13beeb8f..18f0ceed9f1b 100644
>> --- a/drivers/i2c/busses/i2c-tegra.c
>> +++ b/drivers/i2c/busses/i2c-tegra.c
>> @@ -636,7 +636,7 @@ static void tegra_dvc_init(struct tegra_i2c_dev *i2c_dev)
>>  	dvc_writel(i2c_dev, val, DVC_CTRL_REG1);
>>  }
>>  
>> -static int tegra_i2c_runtime_resume(struct device *dev)
>> +static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
>>  {
>>  	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
>>  	int ret;
>> @@ -665,7 +665,7 @@ static int tegra_i2c_runtime_resume(struct device *dev)
>>  	return 0;
>>  }
>>  
>> -static int tegra_i2c_runtime_suspend(struct device *dev)
>> +static int __maybe_unused tegra_i2c_runtime_suspend(struct device *dev)
>>  {
>>  	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
>>  
>> @@ -1711,8 +1711,7 @@ static int tegra_i2c_remove(struct platform_device *pdev)
>>  	return 0;
>>  }
>>  
>> -#ifdef CONFIG_PM_SLEEP
>> -static int tegra_i2c_suspend(struct device *dev)
>> +static int __maybe_unused tegra_i2c_suspend(struct device *dev)
>>  {
>>  	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
>>  
>> @@ -1721,7 +1720,7 @@ static int tegra_i2c_suspend(struct device *dev)
>>  	return 0;
>>  }
>>  
>> -static int tegra_i2c_resume(struct device *dev)
>> +static int __maybe_unused tegra_i2c_resume(struct device *dev)
>>  {
>>  	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
>>  	int err;
>> @@ -1741,18 +1740,13 @@ static const struct dev_pm_ops tegra_i2c_pm = {
>>  			   NULL)
>>  };
>>  
>> -#define TEGRA_I2C_PM	(&tegra_i2c_pm)
>> -#else
>> -#define TEGRA_I2C_PM	NULL
>> -#endif
>> -
>>  static struct platform_driver tegra_i2c_driver = {
>>  	.probe   = tegra_i2c_probe,
>>  	.remove  = tegra_i2c_remove,
>>  	.driver  = {
>>  		.name  = "tegra-i2c",
>>  		.of_match_table = tegra_i2c_of_match,
>> -		.pm    = TEGRA_I2C_PM,
>> +		.pm    = &tegra_i2c_pm,
>>  	},
>>  };
>>  
> 
> Looks good to me.
> 
> Acked-by: Jon Hunter <jonathanh@...dia.com>

Thanks!