For what it's worth, I can confirm the timeout is too slow. I doubled it our kernel: -#define MCP251X_OST_DELAY_MS (5) +#define MCP251X_OST_DELAY_MS (10) On Mon, Jan 28, 2019 at 3:21 AM Andreas Henriksson <andreas@xxxxxxxx> wrote: > > Hi, > > On Mon, Jan 28, 2019 at 02:02:31PM +0300, Alexander Shiyan wrote: > > Ok, lets try to use usleep_range(500, 2000). Can you test this? > > Still fails the same way. (diff attached as before.) > > Regards, > Andreas Henriksson -- Justin