[U-Boot] [PATCH 1/2] mmc: sh_mmcif: Use DIV_ROUND_UP and fls instead of calculation loop

[Nobuhiro Iwamatsu]

Use DIV_ROUND_UP and fls to simplify the code.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj at renesas.com>
---
 drivers/mmc/sh_mmcif.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/sh_mmcif.c b/drivers/mmc/sh_mmcif.c
index ed83a14..8f386e2 100644
--- a/drivers/mmc/sh_mmcif.c
+++ b/drivers/mmc/sh_mmcif.c
@@ -103,20 +103,18 @@ static int mmcif_wait_interrupt_flag(struct sh_mmcif_host *host)
 
 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
 {
-	int i;
-
 	sh_mmcif_bitclr(CLK_ENABLE, &host->regs->ce_clk_ctrl);
 	sh_mmcif_bitclr(CLK_CLEAR, &host->regs->ce_clk_ctrl);
 
 	if (!clk)
 		return;
-	if (clk == CLKDEV_EMMC_DATA) {
+
+	if (clk == CLKDEV_EMMC_DATA)
 		sh_mmcif_bitset(CLK_PCLK, &host->regs->ce_clk_ctrl);
-	} else {
-		for (i = 1; (unsigned int)host->clk / (1 << i) >= clk; i++)
-			;
-		sh_mmcif_bitset((i - 1) << 16, &host->regs->ce_clk_ctrl);
-	}
+	else
+		sh_mmcif_bitset((fls(DIV_ROUND_UP(host->clk,
+						  clk) - 1) - 1) << 16,
+				&host->regs->ce_clk_ctrl);
 	sh_mmcif_bitset(CLK_ENABLE, &host->regs->ce_clk_ctrl);
 }
 
-- 
2.1.3