linux-kernel - Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

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Date:   Mon, 21 Aug 2017 20:17:30 -0500
From:   Franklin S Cooper Jr <fcooper@...com>
To:     Sekhar Nori <nsekhar@...com>, <wsa@...-dreams.de>,
        <robh+dt@...nel.org>, <linux@...linux.org.uk>,
        <linux-i2c@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <grygorii.strashko@...com>,
        <vigneshr@...com>
Subject: Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support



On 08/21/2017 04:05 AM, Sekhar Nori wrote:
> On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:
> 
>> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  	dev->clk = devm_clk_get(&pdev->dev, NULL);
>>  	if (IS_ERR(dev->clk))
>>  		return PTR_ERR(dev->clk);
>> -	clk_prepare_enable(dev->clk);
>>  
>>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  	dev->base = devm_ioremap_resource(&pdev->dev, mem);
>> @@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  		goto err_unuse_clocks;
> 
> This goto is wrong now. There is no need to unwind the pm_runtime setup
> on a devm_ioremap_resource() failure. You can just return error here.

Ok
> 
>>  	}
>>  
>> +	pm_runtime_set_autosuspend_delay(dev->dev,
>> +					 DAVINCI_I2C_PM_TIMEOUT);
>> +	pm_runtime_use_autosuspend(dev->dev);
>> +
>> +	pm_runtime_enable(dev->dev);
>> +
>> +	r = pm_runtime_get_sync(dev->dev);
>> +	if (r < 0) {
>> +		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
>> +		goto err_unuse_clocks;
>> +	}
>> +
>>  	i2c_davinci_init(dev);
>>  
>>  	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
>> @@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  	if (r)
>>  		goto err_unuse_clocks;
>>  
>> +	pm_runtime_mark_last_busy(dev->dev);
>> +	pm_runtime_put_autosuspend(dev->dev);
>> +
>>  	return 0;
>>  
>>  err_unuse_clocks:
>> -	clk_disable_unprepare(dev->clk);
>> +	pm_runtime_dont_use_autosuspend(dev->dev);
>> +	pm_runtime_put_sync(dev->dev);
>> +	pm_runtime_disable(dev->dev);
>> +
>>  	dev->clk = NULL;
> 
> This null setting of clk seems quite bogus and can be cleaned-up.

Do you mean that I should just remove this line?
> 
>>  	return r;
>>  }
> 
> Thanks,
> Sekhar
>