Hi Wolfram,
On Mon, Oct 11, 2010 at 07:10:32PM +0200, Wolfram Sang wrote:
> +static inline void esdhc_set_clock(struct sdhci_host *host, unsigned int
> clock)
> +{
> + int pre_div = 2;
> + int div = 1;
> + u32 temp;
> +
> + temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
> + temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
> + | ESDHC_CLOCK_MASK);
> + sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
> +
> + if (clock == 0)
> + goto out;
> +
> + while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
> + pre_div *= 2;
> +
> + while (host->max_clk / pre_div / div > clock && div < 16)
> + div++;
> +
> + dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
> + clock, host->max_clk / pre_div / div);
> +
> + pre_div >>= 1;
> + div--;
> +
> + temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
> + temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
> + | (div << ESDHC_DIVIDER_SHIFT)
> + | (pre_div << ESDHC_PREDIV_SHIFT));
> + sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
> + mdelay(100);
This isn't directly related to this patchset (the code was there
beforehand), but it would be nice to rework the mdelay(100).
Thanks,
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child
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