linux-kernel - Re: [RESEND PATCH v4 3/3] mmc: sdhci-of-arasan: add runtime pm support

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Date:	Thu, 22 Oct 2015 19:15:01 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	Michal Simek <michal.simek@...inx.com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	shawn.lin@...k-chips.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v4 3/3] mmc: sdhci-of-arasan: add runtime pm
 support

On 2015/10/22 17:44, Michal Simek wrote:
> On 10/22/2015 11:06 AM, Shawn Lin wrote:
>> This patch add runtime_suspend and runtime_resume for
>> sdhci-of-arasan. Currently we also power-off phy at
>> runtime_suspend for power-saving.
>>
>> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>>
>> Serise-changes: 4
>> - remove ifdef for PM callback statement
>> - fix missing pm_runtime_set_active
>> - remove pm_runtime_dont_use_autosuspend from remove hook
>> - add pm_runtime_force_suspend|resume for PM callback to
>>    deal with suspend invoked from rpm
>> - remove wrappers of phy ops
>>
>> ---
>>
>> Changes in v2: None
>>
>>   drivers/mmc/host/sdhci-of-arasan.c | 85 ++++++++++++++++++++++++++++++++++++--
>>   1 file changed, 82 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
>> index 4f30716..fb1915c 100644
>> --- a/drivers/mmc/host/sdhci-of-arasan.c
>> +++ b/drivers/mmc/host/sdhci-of-arasan.c
>> @@ -30,6 +30,8 @@
>>   #define CLK_CTRL_TIMEOUT_MASK		(0xf << CLK_CTRL_TIMEOUT_SHIFT)
>>   #define CLK_CTRL_TIMEOUT_MIN_EXP	13
>>
>> +#define ARASAN_RPM_DELAY_MS		50
>> +
>>   /**
>>    * struct sdhci_arasan_data
>>    * @clk_ahb:	Pointer to the AHB clock
>> @@ -71,6 +73,46 @@ static struct sdhci_pltfm_data sdhci_arasan_pdata = {
>>   			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
>>   };
>>
>> +#ifdef CONFIG_PM
>> +static int sdhci_arasan_runtime_suspend(struct device *dev)
>> +{
>> +	struct sdhci_host *host = dev_get_drvdata(dev);
>> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> +	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
>> +	int ret;
>> +
>> +	ret = sdhci_runtime_suspend_host(host);
>> +	if (ret)
>> +		return ret;
>> +
>> +	if (!IS_ERR(sdhci_arasan->phy))
>> +		phy_power_off(sdhci_arasan->phy);
>> +
>> +	clk_disable(sdhci_arasan->clk_ahb);
>> +	clk_disable(pltfm_host->clk);
>> +
>> +	return 0;
>> +}
>> +
>> +static int sdhci_arasan_runtime_resume(struct device *dev)
>> +{
>> +	struct sdhci_host *host = dev_get_drvdata(dev);
>> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> +	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
>> +
>> +	clk_enable(pltfm_host->clk);
>> +	clk_enable(sdhci_arasan->clk_ahb);
>> +
>> +	if (!IS_ERR(sdhci_arasan->phy))
>> +		phy_power_on(sdhci_arasan->phy);
>> +
>> +	return sdhci_runtime_resume_host(host);
>> +}
>> +#else
>> +#define sdhci_arasan_runtime_suspend NULL
>> +#define sdhci_arasan_runtime_resume NULL
>
> Remove these 3 lines - they are not needed.

Ah, Got it. Thanks.

>
>> +#endif
>> +
>>   #ifdef CONFIG_PM_SLEEP
>>   /**
>>    * sdhci_arasan_suspend - Suspend method for the driver
>> @@ -87,6 +129,12 @@ static int sdhci_arasan_suspend(struct device *dev)
>>   	struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv;
>>   	int ret;
>>
>> +	ret = pm_runtime_force_suspend(dev);
>> +	if (ret) {
>> +		dev_err(dev, "problem force suspending\n");
>> +		return ret;
>> +	}
>> +
>>   	ret = sdhci_suspend_host(host);
>>   	if (ret)
>>   		return ret;
>> @@ -140,18 +188,39 @@ static int sdhci_arasan_resume(struct device *dev)
>>   		}
>>   	}
>>
>> -	return sdhci_resume_host(host);
>> +	ret = sdhci_resume_host(host);
>> +	if (ret)
>> +		goto err_resume_host;
>> +
>> +	ret = pm_runtime_force_resume(dev);
>> +	if (ret) {
>> +		dev_err(dev, "problem force resuming\n");
>> +		goto err_force_resume;
>> +	}
>> +
>> +	return 0;
>>
>> +err_force_resume:
>> +	sdhci_suspend_host(host);
>> +err_resume_host:
>> +	if (!IS_ERR(sdhci_arasan->phy))
>> +		phy_power_off(sdhci_arasan->phy);
>>   err_phy_power:
>>   	clk_disable(pltfm_host->clk);
>>   err_clk_en:
>>   	clk_disable(sdhci_arasan->clk_ahb);
>>   	return ret;
>>   }
>> +#else
>> +#define sdhci_arasan_suspend NULL
>> +#define sdhci_arasan_resume NULL
>
> Remove these 3 lines - they are not needed.
>
> Thanks,
> Michal
>
>
>


-- 
Best Regards
Shawn Lin

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