Hi Philip,
I'd like to take this patch. One comment, though:
On Fri, Oct 01, 2010 at 03:45:50PM -0700, Philip Rakity wrote:
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 73a94fe..ec103c3 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1182,17 +1182,31 @@ static void sdhci_set_ios(struct mmc_host *mmc,
> struct mmc_ios *ios)
> else
> sdhci_set_power(host, ios->vdd);
>
> - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
>
> - if (ios->bus_width == MMC_BUS_WIDTH_8)
> - ctrl |= SDHCI_CTRL_8BITBUS;
> - else
> - ctrl &= ~SDHCI_CTRL_8BITBUS;
> + /*
> + * use platform_8_bit_width if not v3 controller
> + * or if special hw/board specific processing is needed
> + */
> + if (host->ops->platform_8bit_width)
> + host->ops->platform_8bit_width(host, ios->bus_width);
> + else {
> + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> + if (ios->bus_width == MMC_BUS_WIDTH_8) {
> + ctrl &= ~SDHCI_CTRL_4BITBUS;
> + if (host->version >= SDHCI_SPEC_300)
> + ctrl |= SDHCI_CTRL_8BITBUS;
> + } else {
> + if (host->version >= SDHCI_SPEC_300)
> + ctrl &= ~SDHCI_CTRL_8BITBUS;
> + if (ios->bus_width == MMC_BUS_WIDTH_4)
> + ctrl |= SDHCI_CTRL_4BITBUS;
> + else
> + ctrl &= ~SDHCI_CTRL_4BITBUS;
> + }
> + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> + }
>
> - if (ios->bus_width == MMC_BUS_WIDTH_4)
> - ctrl |= SDHCI_CTRL_4BITBUS;
> - else
> - ctrl &= ~SDHCI_CTRL_4BITBUS;
> + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
I don't see why we should re-read ctrl here, since we've already written
it back to the device at this point, and we don't use it anywhere below
this line.
Thanks,
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child
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