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mxc_spi: Round up clock divider

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Since the input frequency of the API is a maximum that should not be exceeded in
order for the devices to operate properly, the SPI clock divider should be
rounded up, not truncated.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Benoît Thébaudeau 2012-08-10 08:51:50 +00:00 committed by Albert ARIBAUD
parent 78befb695d
commit cd2004037c
1 changed files with 2 additions and 2 deletions
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4
drivers/spi/mxc_spi.c
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@ -96,7 +96,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
clk_src = mxc_get_clock(MXC_CSPI_CLK);
div = clk_src / max_hz;
div = DIV_ROUND_UP(clk_src, max_hz);
div = get_cspi_div(div);
debug("clk %d Hz, div %d, real clk %d Hz\n",
@ -147,7 +147,7 @@ static s32 spi_cfg_mxc(struct mxc_spi_slave *mxcs, unsigned int cs,
* The following computation is taken directly from Freescale's code.
*/
if (clk_src > max_hz) {
pre_div = clk_src / max_hz;
pre_div = DIV_ROUND_UP(clk_src, max_hz);
if (pre_div > 16) {
post_div = pre_div / 16;
pre_div = 15;