linux-kernel - Re: [PATCH v2] mtd: atmel-quadspi: add suspend/resume hooks

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Message-ID: <0be344a2-9878-2b92-9436-bc2f4d4fd6e0@microchip.com>
Date:   Mon, 18 Jun 2018 15:00:06 +0300
From:   Claudiu Beznea <Claudiu.Beznea@...rochip.com>
To:     Marek Vasut <marek.vasut@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>
CC:     <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <richard@....at>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] mtd: atmel-quadspi: add suspend/resume hooks



On 18.06.2018 12:53, Marek Vasut wrote:
> On 06/18/2018 11:49 AM, Boris Brezillon wrote:
>> Hi Claudiu,
>>
>> The subject prefix should be "mtd: spi-nor: atmel-quadspi: ". No need
>> to send a new version just for that, I'll fix it when applying the
>> patch.
>>
Hi Boris,

Thank you!

>> Looks good otherwise. Marek, any objection? If not, can you add your
>> Acked-by?
> 
> Will this work if you have ie. ubifs mounted on that QSPI NOR and you
> suspect and resume during IO ? I think it would, but just curious if
> there could be some problem.

Hi Marek,

I tested only with read/writes while suspending, simple scripts, but not
having ubifs mounted on QSPI NOR. I will double check also with ubifs
mounted on QSPI NOR and come back with the results.

Thank you,
Claudiu

> 
>> Thanks,
>>
>> Boris
>>
>> On Mon, 4 Jun 2018 11:46:33 +0300
>> Claudiu Beznea <claudiu.beznea@...rochip.com> wrote:
>>
>>> Implement suspend/resume hooks.
>>>
>>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>>> ---
>>>
>>> Changes in v2:
>>> - use __maybe_unused instead of #ifdef CONFIG_PM_SLEEP
>>>
>>>  drivers/mtd/spi-nor/atmel-quadspi.c | 21 +++++++++++++++++++++
>>>  1 file changed, 21 insertions(+)
>>>
>>> diff --git a/drivers/mtd/spi-nor/atmel-quadspi.c b/drivers/mtd/spi-nor/atmel-quadspi.c
>>> index 6c5708bacad8..ceaaef47f02e 100644
>>> --- a/drivers/mtd/spi-nor/atmel-quadspi.c
>>> +++ b/drivers/mtd/spi-nor/atmel-quadspi.c
>>> @@ -737,6 +737,26 @@ static int atmel_qspi_remove(struct platform_device *pdev)
>>>  	return 0;
>>>  }
>>>  
>>> +static int __maybe_unused atmel_qspi_suspend(struct device *dev)
>>> +{
>>> +	struct atmel_qspi *aq = dev_get_drvdata(dev);
>>> +
>>> +	clk_disable_unprepare(aq->clk);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int __maybe_unused atmel_qspi_resume(struct device *dev)
>>> +{
>>> +	struct atmel_qspi *aq = dev_get_drvdata(dev);
>>> +
>>> +	clk_prepare_enable(aq->clk);
>>> +
>>> +	return atmel_qspi_init(aq);
>>> +}
>>> +
>>> +static SIMPLE_DEV_PM_OPS(atmel_qspi_pm_ops, atmel_qspi_suspend,
>>> +			 atmel_qspi_resume);
>>>  
>>>  static const struct of_device_id atmel_qspi_dt_ids[] = {
>>>  	{ .compatible = "atmel,sama5d2-qspi" },
>>> @@ -749,6 +769,7 @@ static struct platform_driver atmel_qspi_driver = {
>>>  	.driver = {
>>>  		.name	= "atmel_qspi",
>>>  		.of_match_table	= atmel_qspi_dt_ids,
>>> +		.pm	= &atmel_qspi_pm_ops,
>>>  	},
>>>  	.probe		= atmel_qspi_probe,
>>>  	.remove		= atmel_qspi_remove,
> 
>