linux-kernel - RE: [PATCH 1/2] input: keyboard: imx: no need to control interrupt status in event check

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Date:   Thu, 4 Apr 2019 01:29:48 +0000
From:   Anson Huang <anson.huang@....com>
To:     "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>
CC:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 1/2] input: keyboard: imx: no need to control interrupt
 status in event check

Hi, Dmitry

Best Regards!
Anson Huang

> -----Original Message-----
> From: dmitry.torokhov@...il.com [mailto:dmitry.torokhov@...il.com]
> Sent: 2019年4月4日 5:49
> To: Anson Huang <anson.huang@....com>
> Cc: shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; linux-input@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; dl-linux-
> imx <linux-imx@....com>
> Subject: Re: [PATCH 1/2] input: keyboard: imx: no need to control interrupt
> status in event check
> 
> Hi Anson,
> 
> On Fri, Mar 29, 2019 at 07:00:43AM +0000, Anson Huang wrote:
> > There is no need to enable release interrupt and disable depress
> > interrupt in event check, as a timer is setup for checking these
> > events rather than interrupts.
> 
> But won't using release interrupt allow signalling key release earlier?

It makes sense, patch #1 can be dropped, I will resend the patch #2 for review.

Thanks,
Anson.

> 
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> >  drivers/input/keyboard/imx_keypad.c | 5 -----
> >  1 file changed, 5 deletions(-)
> >
> > diff --git a/drivers/input/keyboard/imx_keypad.c
> > b/drivers/input/keyboard/imx_keypad.c
> > index 539cb67..7e32c36 100644
> > --- a/drivers/input/keyboard/imx_keypad.c
> > +++ b/drivers/input/keyboard/imx_keypad.c
> > @@ -276,11 +276,6 @@ static void imx_keypad_check_for_events(struct
> timer_list *t)
> >  		reg_val = readw(keypad->mmio_base + KPSR);
> >  		reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS;
> >  		writew(reg_val, keypad->mmio_base + KPSR);
> > -
> > -		reg_val = readw(keypad->mmio_base + KPSR);
> > -		reg_val |= KBD_STAT_KRIE;
> > -		reg_val &= ~KBD_STAT_KDIE;
> > -		writew(reg_val, keypad->mmio_base + KPSR);
> >  	}
> >  }
> >
> > --
> > 2.7.4
> >
> 
> Thanks.
> 
> --
> Dmitry