linux-kernel - [PATCH 6/9] serial: workaround TI AR7 silicon bug

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Message-Id: <200906011401.15991.florian@openwrt.org>
Date:	Mon, 1 Jun 2009 14:01:15 +0200
From:	Florian Fainelli <florian@...nwrt.org>
To:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	akpm <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: [PATCH 6/9] serial: workaround TI AR7 silicon bug

This patch make the serial8250_console_putchar work
on TI AR7 hardware which has a hardware bug clobbering
serial characters resulting in an almost unusable
kernel console.

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
---
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 03376b0..16b5a7e 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2694,7 +2694,11 @@ static void serial8250_console_putchar(struct uart_port *port, int ch)
 {
 	struct uart_8250_port *up = (struct uart_8250_port *)port;
 
+#ifdef CONFIG_AR7
+	wait_for_xmitr(up, BOTH_EMPTY);
+#else
 	wait_for_xmitr(up, UART_LSR_THRE);
+#endif
 	serial_out(up, UART_TX, ch);
 }
 
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