From: Geert Uytterhoeven Date: Fri, 24 Jun 2016 14:59:16 +0000 (+0200) Subject: serial: sh-sci: Clear (H)SCIF timeout and overrun during reset X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fc2af3348a4acea0c28db89a8c84660d0baed4aa;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git serial: sh-sci: Clear (H)SCIF timeout and overrun during reset Add the missing timeout bit definition for (H)SCIF. Clear the timeout and overrun flag bits during UART reset, cfr. the initialization flowchart in the datasheet. Signed-off-by: Geert Uytterhoeven Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 408f706393de..432d9acabf7f 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -2156,6 +2156,11 @@ static void sci_reset(struct uart_port *port) sci_clear_SCxSR(port, SCxSR_RDxF_CLEAR(port) & SCxSR_ERROR_CLEAR(port) & SCxSR_BREAK_CLEAR(port)); + if (sci_getreg(port, SCLSR)->size) { + status = serial_port_in(port, SCLSR); + status &= ~(SCLSR_TO | SCLSR_ORER); + serial_port_out(port, SCLSR, status); + } } static void sci_set_termios(struct uart_port *port, struct ktermios *termios, diff --git a/drivers/tty/serial/sh-sci.h b/drivers/tty/serial/sh-sci.h index e7d2bc692a58..ffa6d688c335 100644 --- a/drivers/tty/serial/sh-sci.h +++ b/drivers/tty/serial/sh-sci.h @@ -105,6 +105,7 @@ enum { #define SCFCR_LOOP BIT(0) /* Loopback Test */ /* SCLSR (Line Status Register) on (H)SCIF */ +#define SCLSR_TO BIT(2) /* Timeout */ #define SCLSR_ORER BIT(0) /* Overrun Error */ /* SCSPTR (Serial Port Register), optional */