linux-kernel - [PATCH 6/6] serial: mfd: adjust the baud rate setting

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1291324103-7054-6-git-send-email-gregkh@suse.de>
Date:	Thu,  2 Dec 2010 13:08:23 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Feng Tang <feng.tang@...el.com>, stable <stable@...nel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 6/6] serial: mfd: adjust the baud rate setting

From: Feng Tang <feng.tang@...el.com>

Previous baud rate setting code only has been tested with 3.5M/9600/
115200/230400/460800 bps, and recently we got a 3M bps device to test,
which needs to modify current MUL register setting, and with this
patch 2.5M/2M/1.5M/1M/0.5M should also work as they just use a MUL
value scale down from 3M's.

Also got some reference register setting from silicon guys for
different baud rates, which tries to keep the pre-scalar register value
to 16.

Signed-off-by: Feng Tang <feng.tang@...el.com>
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/serial/mfd.c |   24 ++++++++----------------
 1 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/serial/mfd.c b/drivers/serial/mfd.c
index 5fc699e..d40010a 100644
--- a/drivers/serial/mfd.c
+++ b/drivers/serial/mfd.c
@@ -900,8 +900,7 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
 	unsigned char cval, fcr = 0;
 	unsigned long flags;
 	unsigned int baud, quot;
-	u32 mul = 0x3600;
-	u32 ps = 0x10;
+	u32 ps, mul;
 
 	switch (termios->c_cflag & CSIZE) {
 	case CS5:
@@ -943,31 +942,24 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
 	baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
 
 	quot = 1;
+	ps = 0x10;
+	mul = 0x3600;
 	switch (baud) {
 	case 3500000:
 		mul = 0x3345;
 		ps = 0xC;
 		break;
-	case 3000000:
-		mul = 0x2EE0;
-		break;
-	case 2500000:
-		mul = 0x2710;
-		break;
-	case 2000000:
-		mul = 0x1F40;
-		break;
 	case 1843200:
 		mul = 0x2400;
 		break;
+	case 3000000:
+	case 2500000:
+	case 2000000:
 	case 1500000:
-		mul = 0x1770;
-		break;
 	case 1000000:
-		mul = 0xFA0;
-		break;
 	case 500000:
-		mul = 0x7D0;
+		/* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
+		mul = baud / 500000 * 0x9C4;
 		break;
 	default:
 		/* Use uart_get_divisor to get quot for other baud rates */
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/