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>

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index 22b473e..158967a 100644 (file)
--- 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 */