On Wed, Dec 14, 2011 at 6:52 PM, Daniel Mack <zonque@xxxxxxxxx> wrote:
> External circuitry like level shifters may limit the maximum operation
> speed of the hsmmc controller. Add a field to struct omap2_hsmmc_info
> so boards can adjust the setting on demand.
>
> Signed-off-by: Daniel Mack <zonque@xxxxxxxxx>
> Cc: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/mach-omap2/hsmmc.c | 1 +
> arch/arm/mach-omap2/hsmmc.h | 2 ++
> drivers/mmc/host/omap_hsmmc.c | 8 ++++++--
> 3 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
> index f4a1020..4c7bc36 100644
> --- a/arch/arm/mach-omap2/hsmmc.c
> +++ b/arch/arm/mach-omap2/hsmmc.c
> @@ -298,6 +298,7 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
> mmc->slots[0].caps = c->caps;
> mmc->slots[0].internal_clock = !c->ext_clock;
> mmc->dma_mask = 0xffffffff;
> + mmc->max_freq = c->max_freq;
> if (cpu_is_omap44xx())
> mmc->reg_offset = OMAP4_MMC_REG_OFFSET;
> else
> diff --git a/arch/arm/mach-omap2/hsmmc.h b/arch/arm/mach-omap2/hsmmc.h
> index f757e78..65a8c12 100644
> --- a/arch/arm/mach-omap2/hsmmc.h
> +++ b/arch/arm/mach-omap2/hsmmc.h
> @@ -25,6 +25,8 @@ struct omap2_hsmmc_info {
> char *name; /* or NULL for default */
> struct device *dev; /* returned: pointer to mmc adapter */
> int ocr_mask; /* temporary HACK */
> + int max_freq; /* maximum clock, if constrained by external
> + * circuitry, or 0 for default */
> /* Remux (pad configuration) when powering on/off */
> void (*remux)(struct device *dev, int slot, int power_on);
> /* init some special card */
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 101cd31..8215ef9 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -1927,8 +1927,12 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
> if (mmc_slot(host).vcc_aux_disable_is_sleep)
> mmc_slot(host).no_off = 1;
>
> - mmc->f_min = OMAP_MMC_MIN_CLOCK;
> - mmc->f_max = OMAP_MMC_MAX_CLOCK;
> + mmc->f_min = OMAP_MMC_MIN_CLOCK;
> +
> + if (pdata->max_freq > 0)
What about having check as below:
if (pdata->max_freq > 0 && pdata->max_freq < OMAP_MMC_MAX_CLOCK)
> + mmc->f_max = pdata->max_freq;
> + else
> + mmc->f_max = OMAP_MMC_MAX_CLOCK;
>
> spin_lock_init(&host->irq_lock);
>
> --
> 1.7.7.4
>
> --
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