On Fri, Oct 16, 2015 at 10:39:13AM -0500, Konstantin Shkolnyy wrote: > On Fri, Oct 16, 2015 at 10:27 AM, Johan Hovold <johan@xxxxxxxxxx> wrote: > > On Fri, Oct 16, 2015 at 10:11:12AM -0500, Konstantin Shkolnyy wrote: > >> On Fri, Oct 16, 2015 at 8:27 AM, Johan Hovold <johan@xxxxxxxxxx> wrote: > >> > On Thu, Oct 15, 2015 at 06:23:31PM -0500, Konstantin Shkolnyy wrote: > >> >> cp2108 GET_LINE_CTL returns the 16-bit value with the 2 bytes swapped. > >> >> However, SET_LINE_CTL functions properly. When the driver tries to modify > >> >> the register, it reads it, modifies some bits and writes back. Because the > >> >> read bytes were swapped, this often results in an invalid value to be written. > >> >> In turn, this causes cp2108 respond with a stall. The stall sometimes doesn't > >> >> clear properly and cp2108 starts responding to following valid commands also > >> >> with stalls, effectively failing. > >> > > >> > That sounds weird. Are you saying that all or only some cp2108 devices > >> > would be affected by this? And only for the line-control register? > >> > >> The bug exists in all current cp2108 devices and affects only > >> GET_LINE_CTL. But it may be fixed in a future revision. > > > > Ok, have you some kind of confirmation from silabs on this already? > > I work for SiLabs. Heh. :) Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
