From: Vincent Mailhol <vincent.mailhol@gmail.com>
To: Yasushi SHOJI <yasushi.shoji@gmail.com>
Cc: Yasushi SHOJI <yashi@spacecubics.com>,
Wolfgang Grandegger <wg@grandegger.com>,
Marc Kleine-Budde <mkl@pengutronix.de>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
linux-can@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] can: mcba_usb: Fix termination command argument
Date: Thu, 24 Nov 2022 09:53:33 +0900 [thread overview]
Message-ID: <CAMZ6RqJ2L6YntT23rsYEEUK=YDF2LrhB8hXwvYjciu3vzjx2hQ@mail.gmail.com> (raw)
In-Reply-To: <20221123194406.80575-1-yashi@spacecubics.com>
On Thu. 24 Nov. 2022 at 04:53, Yasushi SHOJI <yasushi.shoji@gmail.com> wrote:
> Microchip USB Analyzer can be set with termination setting ON or OFF.
> As I've observed, both with my oscilloscope and USB packet capture
> below, you must send "0" to turn it ON, and "1" to turn it OFF.
>
> Reverse the argument value to fix this.
>
> These are the two commands sequence, ON then OFF.
>
> > No. Time Source Destination Protocol Length Info
> > 1 0.000000 host 1.3.1 USB 46 URB_BULK out
> >
> > Frame 1: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
> > USB URB
> > Leftover Capture Data: a80000000000000000000000000000000000a8
> >
> > No. Time Source Destination Protocol Length Info
> > 2 4.372547 host 1.3.1 USB 46 URB_BULK out
> >
> > Frame 2: 46 bytes on wire (368 bits), 46 bytes captured (368 bits)
> > USB URB
> > Leftover Capture Data: a80100000000000000000000000000000000a9
>
> Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>
> ---
> drivers/net/can/usb/mcba_usb.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
> index 218b098b261d..67beff1a3876 100644
> --- a/drivers/net/can/usb/mcba_usb.c
> +++ b/drivers/net/can/usb/mcba_usb.c
> @@ -785,9 +785,9 @@ static int mcba_set_termination(struct net_device *netdev, u16 term)
> };
>
> if (term == MCBA_TERMINATION_ENABLED)
> - usb_msg.termination = 1;
> - else
> usb_msg.termination = 0;
> + else
> + usb_msg.termination = 1;
>
> mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
Nitpick: does it make sense to rename the field to something like
usb_msg.termination_disable or usb_msg.termination_off? This would
make it more explicit that this is a "reverse" boolean.
next prev parent reply other threads:[~2022-11-24 0:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 19:44 [PATCH] can: mcba_usb: Fix termination command argument Yasushi SHOJI
2022-11-23 22:34 ` Marc Kleine-Budde
2022-11-24 9:50 ` Yasushi SHOJI
2022-11-24 0:53 ` Vincent Mailhol [this message]
2022-11-24 9:52 ` Yasushi SHOJI
2022-11-24 9:54 ` Vincent Mailhol
2022-11-24 14:38 ` Marc Kleine-Budde
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