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

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Date:   Thu, 18 Apr 2019 14:36:52 +0800
From:   Chaotian Jing <chaotian.jing@...iatek.com>
To:     NeilBrown <neil@...wn.name>
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 Wed, 2019-04-17 at 08:12 +1000, NeilBrown wrote:
> 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
> 
> 
I just want to change it to IRQF_TRIGGER_NONE, Since IRQF_TRIGGER_NONE
is defined as 0, it's ok to use 0 instead of it.
> >> 			       0, pdev->name, host);
> >>  	if (ret)
> >>  		goto release;
> >>  
> >> 
> >>