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ARM: LPC32xx: Remove wrong re-initialization of MMC clock register

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This patch fixes a bug, (wrongfully) resetting the value of
LPC32XX_CLKPWR_MS_CTRL back to its initial contents (after careful setup). This
was discovered only with a board/bootloader combination (EA3250) where the
contents of the respective register wasn't already at the correct value on
Linux boot.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
This commit is contained in:
Roland Stigge 2012-07-01 21:06:45 +02:00
parent b0d9ef0e2d
commit a0a30b6a69
1 changed files with 3 additions and 7 deletions
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10
arch/arm/mach-lpc32xx/clock.c
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@ -871,7 +871,7 @@ static unsigned long mmc_round_rate(struct clk *clk, unsigned long rate)
static int mmc_set_rate(struct clk *clk, unsigned long rate)
{
u32 oldclk, tmp;
u32 tmp;
unsigned long prate, div, crate = mmc_round_rate(clk, rate);
prate = clk->parent->get_rate(clk->parent);
@ -879,16 +879,12 @@ static int mmc_set_rate(struct clk *clk, unsigned long rate)
div = prate / crate;
/* The MMC clock must be on when accessing an MMC register */
oldclk = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
__raw_writel(oldclk | LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
LPC32XX_CLKPWR_MS_CTRL);
tmp = __raw_readl(LPC32XX_CLKPWR_MS_CTRL) &
~LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(0xf);
tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(div);
tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(div) |
LPC32XX_CLKPWR_MSCARD_SDCARD_EN;
__raw_writel(tmp, LPC32XX_CLKPWR_MS_CTRL);
__raw_writel(oldclk, LPC32XX_CLKPWR_MS_CTRL);
return 0;
}