linux-kernel - Re: [PATCH 1/3] input: ps2-gpio: use ktime for IRQ timekeeping

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Date:   Tue, 15 Feb 2022 13:09:33 +0100
From:   Danilo Krummrich <danilokrummrich@...develop.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linus.walleij@...aro.org
Subject: Re: [PATCH 1/3] input: ps2-gpio: use ktime for IRQ timekeeping

Hi Dmitry,

On Mon, Feb 14, 2022 at 10:14:24PM -0800, Dmitry Torokhov wrote:
> Hi Danilo,
> 
> On Fri, Feb 11, 2022 at 10:22:56PM +0100, Danilo Krummrich wrote:
> > @@ -128,20 +155,33 @@ static irqreturn_t ps2_gpio_irq_rx(struct ps2_gpio_data *drvdata)
> >  	unsigned char byte, cnt;
> >  	int data;
> >  	int rxflags = 0;
> > -	static unsigned long old_jiffies;
> > +	static ktime_t t_last, t_now;
> > +	s64 us_delta;
> >  
> >  	byte = drvdata->rx_byte;
> >  	cnt = drvdata->rx_cnt;
> >  
> > -	if (old_jiffies == 0)
> > -		old_jiffies = jiffies;
> > +	t_now = ktime_get();
> > +	if (t_last == 0)
> 
> Instead of checking this every time, do you think we could seed the
> value in ps2_gpio_open() (and also make it per-port, not static)?
Oops! Sure, I'll send a v2.

I will also add another patch to refactor struct ps2_gpio_data to clearly
separate rx and tx state data, otherwise it might start to become a bit messy.
> 
> Thanks.
> 
> -- 
> Dmitry

- Danilo