From cb55b3320014b7f6014416c556fe506efbf0a84b Mon Sep 17 00:00:00 2001
From: Scott Wood <scottwood@freescale.com>
Date: Tue, 18 Sep 2012 18:19:05 -0500
Subject: [PATCH] serial/ns16550: wait for TEMT before initializing
TEMT is set when the transmitter is totally empty and all output has
finished.
This prevents output problems (including a loss of synchronization
observed on p2020 that persisted for quite a while) if SPL has output
still on its way out.
Signed-off-by: Scott Wood <scottwood@freescale.com>
--
v2: fixed typo in subject, and explained what the bit does in the changelog
---
drivers/serial/ns16550.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 9027781445..bbd91ca247 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -36,6 +36,9 @@
void NS16550_init(NS16550_t com_port, int baud_divisor)
{
+ while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
+ ;
+
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
defined(CONFIG_AM33XX)
--
2.39.5