linux-kernel - [23/78] serial: also set the uartclk value in resume after goes to highspeed

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Message-Id: <20110321230324.058743782@clark.kroah.org>
Date:	Mon, 21 Mar 2011 16:01:39 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Greg Kroah-Hartman <greg@...ah.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Yin Kangkai <kangkai.yin@...ux.intel.com>
Subject: [23/78] serial: also set the uartclk value in resume after goes to highspeed

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Yin Kangkai <kangkai.yin@...ux.intel.com>

commit 95926d2db6256e08d06b753752a0d903a0580acc upstream.

For any reason if the NS16550A was not work in high speed mode (e.g. we hold
NS16550A from going to high speed mode in autoconfig_16550a()), now we are
resume from suspend, we should also set the uartclk to the correct
value. Otherwise it is still the old 1843200 and that will bring issues.

CC: Greg Kroah-Hartman <greg@...ah.com>
CC: David Woodhouse <dwmw2@...radead.org>
CC: linux-kernel@...r.kernel.org
Signed-off-by: Yin Kangkai <kangkai.yin@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/tty/serial/8250.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/serial/8250.c
+++ b/drivers/tty/serial/8250.c
@@ -3036,6 +3036,7 @@ void serial8250_resume_port(int line)
 		serial_outp(up, 0x04, tmp);
 
 		serial_outp(up, UART_LCR, 0);
+		up->port.uartclk = 921600*16;
 	}
 	uart_resume_port(&serial8250_reg, &up->port);
 }


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