From: Richard Leitner <richard.leitner@skidata.com>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Marco Felsch <m.felsch@pengutronix.de>,
<gregkh@linuxfoundation.org>, <linux-usb@vger.kernel.org>,
<kernel@pengutronix.de>
Subject: Re: [PATCH] usb: usb251xb: check if hub is already attached
Date: Thu, 27 Feb 2020 10:09:54 +0100 [thread overview]
Message-ID: <20200227090954.GC13758@pcleri> (raw)
In-Reply-To: <20200227084133.spydp5fudfqc6eim@pengutronix.de>
On Thu, Feb 27, 2020 at 09:41:33AM +0100, Uwe Kleine-König wrote:
> Hello,
>
> On Thu, Feb 27, 2020 at 09:30:07AM +0100, Richard Leitner wrote:
> > On Thu, Feb 27, 2020 at 09:14:48AM +0100, Uwe Kleine-König wrote:
> > > If you write this as:
> > >
> > > if (!hub->gpio_reset && usb251xb_hub_attached(hub))
> > > return 0;
> > >
> > > you save some i2c transfers in the presence of a reset gpio.
> >
> > I'd also go with this solution, so you only have i2c transfers when a
> > reset gpio is configured/present.
>
> Nitpick: you only have additional i2c transfers if *no* reset gpio is
> configured/present.
Sure... That "no" got lost somewhere between my brain and the keyboard ;-)
regards;rl
>
> Best regards
> Uwe
>
> --
> Pengutronix e.K. | Uwe Kleine-König |
> Industrial Linux Solutions | https://www.pengutronix.de/ |
next prev parent reply other threads:[~2020-02-27 9:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-27 7:25 [PATCH] usb: usb251xb: check if hub is already attached Marco Felsch
2020-02-27 8:14 ` Uwe Kleine-König
2020-02-27 8:30 ` Richard Leitner
2020-02-27 8:41 ` Uwe Kleine-König
2020-02-27 9:09 ` Richard Leitner [this message]
2020-02-27 9:29 ` Marco Felsch
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