From: Manfred Huber <man.huber@arcor.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/1 v2] omap3_beagle: Enabling UART3 first allows the Transmitter to be empty
Date: Mon, 25 Mar 2013 23:02:47 +0100 [thread overview]
Message-ID: <5150C987.1040802@arcor.de> (raw)
In-Reply-To: <CABxcv=kCxx+S6D12C9GKFdPF5aJPs5T6o+WdbA5_ZXYFGd2owQ@mail.gmail.com>
From: Manfred Huber
Due to a Bug in the ROM code of some OMAP3 devices, the TEMT bit is not
set if UART3 is configured before (only THRE is set). Reason is the
disabling of UART3 even though the Transmitter is not empty. Enabling
UART3 allows the Transmitter to be empty.
Signed-off-by: Manfred Huber <man.huber@arcor.de>
---
drivers/serial/ns16550.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index b2da8b3..24ff84f 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -36,10 +36,18 @@
void NS16550_init(NS16550_t com_port, int baud_divisor)
{
-#if (!defined(CONFIG_SYS_NS16550_BROKEN_TEMT))
+#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
+ if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE)) ==
UART_LSR_THRE) {
+ serial_out(UART_LCR_DLAB, &com_port->lcr);
+ serial_out(baud_divisor & 0xff, &com_port->dll);
+ serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
+ serial_out(UART_LCRVAL, &com_port->lcr);
+ serial_out(0, &com_port->mdr1);
+ }
+#endif
+
while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
;
-#endif
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
next prev parent reply other threads:[~2013-03-25 22:02 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-27 13:09 [U-Boot] Beagleboard: SPL hangs on serial init man.huber at arcor.de
2013-03-16 13:13 ` Manfred Huber
2013-03-19 14:49 ` Tom Rini
2013-03-19 23:52 ` Manfred Huber
2013-03-20 0:05 ` Javier Martinez Canillas
2013-03-20 1:27 ` Tom Rini
2013-03-20 23:09 ` Manfred Huber
2013-03-21 21:08 ` Javier Martinez Canillas
2013-03-23 10:11 ` Manfred Huber
2013-03-21 19:03 ` [U-Boot] [PATCH] omap3_beagle: Enable CONFIG_SYS_NS16550_BROKEN_TEMT Manfred Huber
2013-03-21 21:28 ` Javier Martinez Canillas
2013-03-21 22:21 ` Tom Rini
2013-03-21 22:28 ` Scott Wood
2013-03-25 22:02 ` Manfred Huber [this message]
2013-03-27 4:50 ` [U-Boot] [PATCH 1/1 v2] omap3_beagle: Enabling UART3 first allows the Transmitter to be empty Manfred Huber
2013-03-27 9:29 ` Javier Martinez Canillas
2013-03-27 13:57 ` Tom Rini
2013-03-28 5:55 ` Manfred Huber
2013-03-29 8:19 ` Manfred Huber
2013-03-28 15:21 ` Tom Rini
2013-03-27 13:37 ` Andreas Bießmann
2013-03-27 17:22 ` Javier Martinez Canillas
2013-03-28 6:06 ` Manfred Huber
2013-03-28 8:45 ` Andreas Bießmann
2013-03-28 9:11 ` Javier Martinez Canillas
2013-03-28 9:50 ` Andreas Bießmann
2013-03-28 15:21 ` Tom Rini
2013-03-29 8:33 ` Manfred Huber
2013-03-29 9:20 ` [U-Boot] [PATCH 1/1 v3] " Manfred Huber
2013-03-29 9:43 ` Albert ARIBAUD
2013-03-29 12:34 ` Tom Rini
2013-03-29 12:42 ` [U-Boot] [PATCH 1/1 v4] omap3_beagle: Flush UART3 xmit on enable if TEMT is broken Manfred Huber
2013-03-29 12:52 ` [U-Boot] [PATCH 1/1 v5] " Manfred Huber
2013-04-02 7:46 ` Javier Martinez Canillas
2013-04-02 8:59 ` Andreas Bießmann
2013-04-08 16:56 ` [U-Boot] [U-Boot, 1/1, " Tom Rini
2013-04-10 22:12 ` [U-Boot] [PATCH v1 1/1] omap3: Display MHz instead of mHz on the console Manfred Huber
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