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Commit 86df1745 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Chris Ball
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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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 4d6144de

drivers/mmc/host/sh_mmcif.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

}