netdev - Re: [PATCH] can: flexcan: bump FLEXCAN_TIMEOUT

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Message-ID: <a418bbc9-186c-174a-20d8-18cedeaf0089@pengutronix.de>
Date:   Wed, 20 Mar 2019 14:18:02 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Thomas Winding <twi@...f.com>, Fabio Estevam <festevam@...il.com>,
        Per Christensen <pnc@...f.com>,
        Rasmus Villemoes <Rasmus.Villemoes@...vas.se>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: flexcan: bump FLEXCAN_TIMEOUT_US to 250

On 3/7/19 4:00 PM, Rasmus Villemoes wrote:
> While trying to add support for the Flexcan modules on the MPC8309,
> I'm hitting ETIMEDOUT in flexcan_chip_disable(). With this, probing
> succeeds. Checking the leftover value of timeout with a primitive
> 
>   pr_err("%s: timeout==%d\n", __func__, timeout);
> 
> after the loop in chip_disable() typically shows values around 12-14,
> i.e. suggesting that it takes about 110-130 us for the LPM_ACK bit to
> appear. So a timeout value of about twice that seems reasonable.
> 
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@...vas.dk>

I've scheduled the patch by Joakim Zhang:

    9daed89ae8a3 can: flexcan: fix timeout when set small bitrate

that doubles the timeout to 100.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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