On Tue, Mar 13, 2012 at 9:27 PM, Linus Walleij <linus.walleij@xxxxxxxxxxxxxx> wrote: > From: Linus Walleij <linus.walleij@xxxxxxxxxx> > > Chanho Min reported that when the boot loader transfers > control to the kernel, there may be pending interrupts > causing the UART to lock up in an eternal loop trying to > pick tokens from the FIFO (since the RX interrupt flag > indicates there are tokens) while in practice there are > no tokens - in fact there is only a pending IRQ flag. > > This patch address the issue with a combination of two > patches suggested by Russell King that clears and mask > all interrupts at probe() and clears any pending error > and RX interrupts at port startup time. > > We suspect the spurious interrupts are a side-effect of > switching the UART from FIFO to non-FIFO mode. I've tested this patch, and have confirmed that the issue is resolved on our CA9 platform. In addition, May I ask to change the tag as follows. Reported-by: Chanho Min <chanho.min@xxxxxxx> Reviewed-by: Jong-Sung Kim <neidhard.kim@xxxxxxx> Thanks a lot ! Chanho Min -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
