From: Feng Tang <feng.tang@intel.com>
To: linux-serial@vger.kernel.org, greg@kroah.com, alan@linux.intel.com
Cc: Feng Tang <feng.tang@intel.com>
Subject: [PATCH] serial: mfd: adjust the baud rate setting
Date: Fri, 19 Nov 2010 10:20:26 +0800 [thread overview]
Message-ID: <1290133226-6429-1-git-send-email-feng.tang@intel.com> (raw)
This change is made according to silicon engineers' feedback and
the real world test result.
Signed-off-by: Feng Tang <feng.tang@intel.com>
---
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 */
--
1.7.0.4
next reply other threads:[~2010-11-19 1:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-19 2:20 Feng Tang [this message]
2010-11-19 2:05 ` [PATCH] serial: mfd: adjust the baud rate setting Greg KH
2010-11-19 2:46 ` Feng Tang
-- strict thread matches above, loose matches on Subject: below --
2010-11-19 3:01 Feng Tang
2010-11-19 4:03 ` Greg KH
2010-11-19 5:15 ` Feng Tang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1290133226-6429-1-git-send-email-feng.tang@intel.com \
--to=feng.tang@intel.com \
--cc=alan@linux.intel.com \
--cc=greg@kroah.com \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).