linux-kernel - Re: [PATCH 2/5] mmc: mtk-sd: don't hard-code interrupt trigger type

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Date:   Wed, 17 Apr 2019 08:12:28 +1000
From:   NeilBrown <neil@...wn.name>
To:     Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, thirtythreeforty@...il.com
Subject: Re: [PATCH 2/5] mmc: mtk-sd: don't hard-code interrupt trigger type

On Tue, Apr 16 2019, Chaotian Jing wrote:

> On Tue, 2019-04-16 at 14:47 +1000, NeilBrown wrote:
>> When using devicetree for configuration, interrupt trigger type
>> should be described in the dts file, not hard-coded in the C code.
>> 
>> The mtk-sd silicon in the mt7621 soc uses an active-high interrupt
>> and so cannot be used with the current code.
>> 
>> So remove the trigger and leave it to be set from devicetree.
>> 
>> Signed-off-by: NeilBrown <neil@...wn.name>
>> ---
>>  drivers/mmc/host/mtk-sd.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
>> index 4492a4465c0e..14e048239143 100644
>> --- a/drivers/mmc/host/mtk-sd.c
>> +++ b/drivers/mmc/host/mtk-sd.c
>> @@ -2243,7 +2243,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
>>  	msdc_init_hw(host);
>>  
>>  	ret = devm_request_irq(&pdev->dev, host->irq, msdc_irq,
>> -		IRQF_TRIGGER_LOW | IRQF_ONESHOT, pdev->name, host);
>> +
> change it to IRQF_TRIGGER_NONE | IRQF_ONESHOT

Why do we need IRQF_ONESHOT.  That is for threaded interrupted
handlers...
msdc_irq() clears the interrupts, so ONESHOT isn't needed.

???

NeilBrown


>> 			       0, pdev->name, host);
>>  	if (ret)
>>  		goto release;
>>  
>> 
>> 

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