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mmc: sh_mmcif: simplify clock divisor calculation 

Replace ilog2(__rounddown_pow_of_two(x)) with the equivalent but much
simpler fls(x) - 1.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2011-11-23 15:52:30 +01:00 committed by Chris Ball
parent 4d6144de8b
commit 86df174585
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/sh_mmcif.c
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@ -16,6 +16,7 @@
*
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
@ -399,7 +400,7 @@ static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
else
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
(ilog2(__rounddown_pow_of_two(host->clk / clk)) << 16));
((fls(host->clk / clk) - 1) << 16));
sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
}