serial: omap-serial: Enable the UART wake-up bits always

OMAP can do also dynamic idling so wake-up enable register should be set
also while system is running. If UART_OMAP_WER is not set, then for instance
the RX activity cannot wake up the UART port that is sleeping.

This RX wake-up feature was working when the 8250 driver was used instead
of omap-serial. Reason for this is that the 8250 doesn't set the
UART_OMAP_WER and then arch/arm/mach-omap2/pm34xx.c ends up saving and
restoring the reset default which is the same than value
OMAP_UART_WER_MOD_WKUP here.

Fix this by moving the conditional UART_OMAP_WER write from serial_omap_pm
into serial_omap_startup where wake-up bits are set unconditionally.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Cc: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 699b34446a55f990cacee9f0bf94ef423c128d4d..763537943a530d71021887bef0767af2ac39a16d 100644 (file)
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -520,6 +520,9 @@ static int serial_omap_startup(struct uart_port *port)
        up->ier = UART_IER_RLSI | UART_IER_RDI;
        serial_out(up, UART_IER, up->ier);
 
+       /* Enable module level wake up */
+       serial_out(up, UART_OMAP_WER, OMAP_UART_WER_MOD_WKUP);
+
        up->port_activity = jiffies;
        return 0;
 }
@@ -827,9 +830,6 @@ serial_omap_pm(struct uart_port *port, unsigned int state,
        serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
        serial_out(up, UART_EFR, efr);
        serial_out(up, UART_LCR, 0);
-       /* Enable module level wake up */
-       serial_out(up, UART_OMAP_WER,
-               (state != 0) ? OMAP_UART_WER_MOD_WKUP : 0);
 }
 
 static void serial_omap_release_port(struct uart_port *port)