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| author | Hugo Villeneuve <hugo.villeneuve@lyrtech.com> | 2008-07-15 11:23:02 -0400 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-07-15 21:53:29 +0200 |
| commit | bcab74baa6b1b1c969038ab6f64a186239180405 (patch) | |
| tree | 2e7ff3fc74b6fb49a4c2a9a7ac12111a03ddd600 /drivers/serial/serial.c | |
| parent | 0328ef0edfe950f0b7b8b368dae482531506b74a (diff) | |
| download | u-boot-imx-bcab74baa6b1b1c969038ab6f64a186239180405.zip u-boot-imx-bcab74baa6b1b1c969038ab6f64a186239180405.tar.gz u-boot-imx-bcab74baa6b1b1c969038ab6f64a186239180405.tar.bz2 | |
Round the serial port clock divisor value returned by calc_divisor()
Round the serial port clock divisor value returned by
calc_divisor()
Signed-off-by: Hugo Villeneuve <hugo.villeneuve@lyrtech.com>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>
Diffstat (limited to 'drivers/serial/serial.c')
| -rw-r--r-- | drivers/serial/serial.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c index 4ccaee2..8bbfcf9 100644 --- a/drivers/serial/serial.c +++ b/drivers/serial/serial.c @@ -124,8 +124,6 @@ static NS16550_t serial_ports[4] = { static int calc_divisor (NS16550_t port) { - uint32_t clk_divisor; - #ifdef CONFIG_OMAP1510 /* If can't cleanly clock 115200 set div to 1 */ if ((CFG_NS16550_CLK == 12000000) && (gd->baudrate == 115200)) { @@ -149,15 +147,11 @@ static int calc_divisor (NS16550_t port) /* Compute divisor value. Normally, we should simply return: * CFG_NS16550_CLK) / MODE_X_DIV / gd->baudrate - * but we need to round that value by adding 0.5 (2/4). + * but we need to round that value by adding 0.5. * Rounding is especially important at high baud rates. */ - clk_divisor = (((4 * CFG_NS16550_CLK) / - (MODE_X_DIV * gd->baudrate)) + 2) / 4; - - debug("NS16550 clock divisor = %d\n", clk_divisor); - - return clk_divisor; + return (CFG_NS16550_CLK + (gd->baudrate * (MODE_X_DIV / 2))) / + (MODE_X_DIV * gd->baudrate); } #if !defined(CONFIG_SERIAL_MULTI) |