[PATCH] Added a Receive_Abort to the Marvell serial driver

Added a Receive_Abort to the Marvell serial driver

Fix occasional input overrun errors on Marvell serial driver

- If the Marvell serial driver is repeatedly started and then stopped it
  will occasionally report an input overrun error when started.

- Added a Receive_Abort to the Marvell serial driver to abort previously
  received receive errors when re-starting the receive

Acked-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Carlos Sanchez <csanchez@mvista.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index efe79b1..aec83f5 100644 (file)
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -1100,6 +1100,8 @@ mpsc_start_rx(struct mpsc_port_info *pi)
 {
        pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
 
+       /* Issue a Receive Abort to clear any receive errors */
+       writel(MPSC_CHR_2_RA, pi->mpsc_base + MPSC_CHR_2);
        if (pi->rcv_data) {
                mpsc_enter_hunt(pi);
                mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);