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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-10-13 17:09:14 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-10-16 19:07:45 +0100 |
| commit | 3ad48062233f32a8dd2649403f5afc076710f86b (patch) | |
| tree | 928182d75cd5a3a1f17d572793b40fe54ffd2a75 /drivers/spi | |
| parent | 289de5541ca6aec56308c04b76c1bb59f00b1f09 (diff) | |
| download | linux-3ad48062233f32a8dd2649403f5afc076710f86b.tar.gz linux-3ad48062233f32a8dd2649403f5afc076710f86b.tar.bz2 linux-3ad48062233f32a8dd2649403f5afc076710f86b.zip | |
spi: pxa2xx: choose closest lower speed
As per discussion [1] the best choice is to set closest speed which is not
going over the asked one.
Do the same approach for Intel Quark boards.
[1] http://www.spinics.net/lists/linux-spi/msg03389.html
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 22b473ebf607..158967a10bec 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -730,7 +730,7 @@ static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds) mul = (1 << 24) >> 1; /* Calculate initial quot */ - q1 = DIV_ROUND_CLOSEST(fref1, rate); + q1 = DIV_ROUND_UP(fref1, rate); /* Scale q1 if it's too big */ if (q1 > 256) { @@ -755,7 +755,7 @@ static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds) /* Case 2 */ - q2 = DIV_ROUND_CLOSEST(fref2, rate); + q2 = DIV_ROUND_UP(fref2, rate); r2 = abs(fref2 / q2 - rate); /* @@ -774,13 +774,13 @@ static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds) mul = (1 << 24) * 2 / 5; } - /* Check case 3 only If the divisor is big enough */ + /* Check case 3 only if the divisor is big enough */ if (fref / rate >= 80) { u64 fssp; u32 m; /* Calculate initial quot */ - q1 = DIV_ROUND_CLOSEST(fref, rate); + q1 = DIV_ROUND_UP(fref, rate); m = (1 << 24) / q1; /* Get the remainder */ |