Messages in this thread Patch in this message | | | From | Joakim Zhang <> | Subject | RE: [PATCH] can: flexcan: fix timeout when set small bitrate | Date | Thu, 14 Feb 2019 09:56:20 +0000 |
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Kindly Ping...
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Best Regards, Joakim Zhang
> -----Original Message----- > From: Joakim Zhang > Sent: 2019年1月31日 17:37 > To: mkl@pengutronix.de; linux-can@vger.kernel.org > Cc: wg@grandegger.com; netdev@vger.kernel.org; > linux-kernel@vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>; Joakim > Zhang <qiangqing.zhang@nxp.com> > Subject: [PATCH] can: flexcan: fix timeout when set small bitrate > > 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@nxp.com> > --- > 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 > 2bca867bcfaa..1f2b4db7da88 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -166,7 +166,7 @@ > #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 (100) > > /* FLEXCAN hardware feature flags > * > -- > 2.17.1
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