On 1/31/19 10:37 AM, Joakim Zhang wrote: > Current we can meet timeout issue when setting a small bitrate like 10000 > as follows on i.MX6UL EVK board (ipg clock = 66MHZ, per clock = 30MHZ): > root@imx6ul7d:~# ip link set can0 up type can bitrate 10000 > A link change request failed with some changes committed already. > Interface can0 may have been left with an inconsistent configuration, please check. > RTNETLINK answers: Connection timed out > > It is caused by calling of flexcan_chip_unfreeze() timeout. > > Originally the code is using usleep_range(10, 20) for unfreeze operation, > but the patch (8badd65 can: flexcan: avoid calling usleep_range from interrupt > context) changed it into udelay(10) which is only a half delay of before, > there're also some other delay changes. > > After double to FLEXCAN_TIMEOUT_US to 100 can fix the issue. > > Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx> Applied to linux-can Tnx, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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