lkml.org 
[lkml]   [2019]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] can: flexcan: bump FLEXCAN_TIMEOUT_US to 250
Date
On 20/03/2019 14.18, Marc Kleine-Budde wrote:
> 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@prevas.dk>
>
> I've scheduled the patch by Joakim Zhang:
>
> 9daed89ae8a3 can: flexcan: fix timeout when set small bitrate
>
> that doubles the timeout to 100.

Eh, ok, but that's not sufficient for the MPC8309 (I tried with 100 at
first, but as I write the minimally working timeout value turns out to
be about 140 us). Do you want me to send another patch on top of
9daed89ae8a3, or how should I interpret the above?

Thanks,
Rasmus
\
 
 \ /
  Last update: 2019-03-21 15:35    [W:0.110 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site