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

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Date:   Mon, 18 Mar 2019 07:40:49 +0000
From:   Rasmus Villemoes <Rasmus.Villemoes@...vas.se>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>
CC:     Thomas Winding <twi@...f.com>, Fabio Estevam <festevam@...il.com>,
        Per Christensen <pnc@...f.com>,
        "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

ping

On 07/03/2019 16.00, 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>
> ---
>  drivers/net/can/flexcan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
> index 75ce11395ee8..5f32053f78de 100644
> --- a/drivers/net/can/flexcan.c
> +++ b/drivers/net/can/flexcan.c
> @@ -165,7 +165,7 @@
>  #define FLEXCAN_MB_CNT_LENGTH(x)	(((x) & 0xf) << 16)
>  #define FLEXCAN_MB_CNT_TIMESTAMP(x)	((x) & 0xffff)
>  
> -#define FLEXCAN_TIMEOUT_US		(50)
> +#define FLEXCAN_TIMEOUT_US		(250)
>  
>  /* FLEXCAN hardware feature flags
>   *
>