Messages in this thread | | | Date | Tue, 10 Dec 2013 09:11:55 -0300 | From | Ezequiel Garcia <> | Subject | Re: [PATCH v2] serial: 8250_dw: Improve unwritable LCR workaround |
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Hi Tim, James:
On Mon, Dec 09, 2013 at 04:42:23PM -0800, Tim Kryger wrote: > On Fri, Dec 6, 2013 at 4:59 PM, James Hogan <james.hogan@imgtec.com> wrote: > [..] > diff --git a/drivers/tty/serial/8250/8250_dw.c > b/drivers/tty/serial/8250/8250_dw.c > index 4658e3e..5f096c7 100644 > --- a/drivers/tty/serial/8250/8250_dw.c > +++ b/drivers/tty/serial/8250/8250_dw.c > @@ -96,7 +96,8 @@ static void dw8250_serial_out(struct uart_port *p, > int offset, int value) > if (offset == UART_LCR) { > int tries = 1000; > while (tries--) { > - if (value == p->serial_in(p, UART_LCR)) > + unsigned int lcr = p->serial_in(p, UART_LCR); > + if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR)) > return; > dw8250_force_idle(p); > writeb(value, p->membase + (UART_LCR << p->regshift)); > @@ -132,7 +133,8 @@ static void dw8250_serial_out32(struct uart_port > *p, int offset, int value) > if (offset == UART_LCR) { > int tries = 1000; > while (tries--) { > - if (value == p->serial_in(p, UART_LCR)) > + unsigned int lcr = p->serial_in(p, UART_LCR); > + if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR)) > return; > dw8250_force_idle(p); > writel(value, p->membase + (UART_LCR << p->regshift)); > > > Would you mind posting this for proper review so we can get the fix in? >
Applying this change fixes all the problems I reported (just did a quick test on the board I have currently on my desk).
Nice work! -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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