diff options
| author |   José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-11 10:41:07 +0300 |
|---|---|---|
| committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-13 08:17:18 +0300 |
| commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
| tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/tty/serial/mpc52xx_uart.c | |
| parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) | |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/tty/serial/mpc52xx_uart.c')
| -rw-r--r-- | kernel/drivers/tty/serial/mpc52xx_uart.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/drivers/tty/serial/mpc52xx_uart.c b/kernel/drivers/tty/serial/mpc52xx_uart.c index 1589f17c1..8c3e51314 100644 --- a/kernel/drivers/tty/serial/mpc52xx_uart.c +++ b/kernel/drivers/tty/serial/mpc52xx_uart.c @@ -239,8 +239,9 @@ static int mpc52xx_psc_tx_rdy(struct uart_port *port) static int mpc52xx_psc_tx_empty(struct uart_port *port) { - return in_be16(&PSC(port)->mpc52xx_psc_status) - & MPC52xx_PSC_SR_TXEMP; + u16 sts = in_be16(&PSC(port)->mpc52xx_psc_status); + + return (sts & MPC52xx_PSC_SR_TXEMP) ? TIOCSER_TEMT : 0; } static void mpc52xx_psc_start_tx(struct uart_port *port) @@ -405,7 +406,7 @@ static struct psc_ops mpc5200b_psc_ops = { .get_mr1 = mpc52xx_psc_get_mr1, }; -#endif /* CONFIG_MPC52xx */ +#endif /* CONFIG_PPC_MPC52xx */ #ifdef CONFIG_PPC_MPC512x #define FIFO_512x(port) ((struct mpc512x_psc_fifo __iomem *)(PSC(port)+1)) @@ -1134,6 +1135,13 @@ mpc52xx_uart_startup(struct uart_port *port) psc_ops->command(port, MPC52xx_PSC_RST_RX); psc_ops->command(port, MPC52xx_PSC_RST_TX); + /* + * According to Freescale's support the RST_TX command can produce a + * spike on the TX pin. So they recommend to delay "for one character". + * One millisecond should be enough for everyone. + */ + msleep(1); + psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */ psc_ops->fifo_init(port); |