Hi Philip,
On Thu, Sep 23, 2010 at 08:24:32AM -0700, Philip Rakity wrote:
> From: Philip Rakity <prakity@xxxxxxxxxxx>
> Date: Thu, 23 Sep 2010 08:15:03 -0700
> Subject: [PATCH] sdhci: allow for initial eMMC 74 clock generation by controller
>
> resend of patch to fit into 80 char line lengths:
>
> snippet of code for how adaption layer should handle the call.
>
>
> /*
> * eMMC spec calls for the host to send 74 clocks to the card
> * during initialization, right after voltage stabilization.
> * create the clocks manually right here.
> */
> void generate_init_clocks_A0(struct sdhci_host *host, u8 power_mode)
> {
> struct sdhci_mmc_slot *slot = sdhci_priv(host);
>
> DBG ("%s: ENTER %s: slot->power_mode = %d, ios->power_mode = %d\n",
> __func__,
> mmc_hostname(host->mmc),
> slot->power_mode,
> power_mode);
>
> if (slot->power_mode == MMC_POWER_UP
> && power_mode == MMC_POWER_ON) {
>
> /* controller specific code here */
> /* slot->power_mode holds previous power setting */
> }
> slot->power_mode = power_mode;
> }
>
>
> Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 3 +++
> drivers/mmc/host/sdhci.h | 2 ++
> 2 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 6b8ca32..ba8f9a0 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1169,6 +1169,9 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> else
> sdhci_set_power(host, ios->vdd);
>
> + if (host->ops->platform_send_init_74_clocks)
> + host->ops->platform_send_init_74_clocks(host, ios->power_mode);
> +
> ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
>
> if (ios->bus_width == MMC_BUS_WIDTH_8)
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 290b5a8..d73685a 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -325,6 +325,8 @@ struct sdhci_ops {
> unsigned int (*get_max_clock)(struct sdhci_host *host);
> unsigned int (*get_min_clock)(struct sdhci_host *host);
> unsigned int (*get_timeout_clock)(struct sdhci_host *host);
> + void (*platform_send_init_74_clocks)(struct sdhci_host *host,
> + u8 power_mode);
> };
>
> #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
> --
Thanks, applied to mmc-next.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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