On Fri, Jun 20, 2014 at 05:35:22PM +0800, Vincent Yang wrote:
> This patch defines a quirk for platforms unable
> to enable 3.0V support.
> It is a preparation and will be used by Fujitsu
> SDHCI controller f_sdh30 driver.
>
> Signed-off-by: Vincent Yang <vincent.y...@tw.fujitsu.com>
I don't think you need this patch. Instead, you can exclude 3V using the
voltage-ranges = <> in the device tree.
Thanks,
Anton
> drivers/mmc/host/sdhci.c | 3 +++
> include/linux/mmc/sdhci.h | 2 ++
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 47055f3..523075f 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3069,6 +3069,9 @@ int sdhci_add_host(struct sdhci_host *host)
> }
> #endif /* CONFIG_REGULATOR */
>
> + if (host->quirks2 & SDHCI_QUIRK2_NO_3_0_V)
> + caps[0] &= ~SDHCI_CAN_VDD_300;
> +
> /*
> * According to SD Host Controller spec v3.00, if the Host System
> * can afford more than 150mA, Host Driver should set XPC to 1. Also
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index 08abe99..cac0958 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -98,6 +98,8 @@ struct sdhci_host {
> #define SDHCI_QUIRK2_BROKEN_HS200 (1<<6)
> /* Controller does not support DDR50 */
> #define SDHCI_QUIRK2_BROKEN_DDR50 (1<<7)
> +/* The system physically doesn't support 3.0v, even if the host does */
> +#define SDHCI_QUIRK2_NO_3_0_V (1<<8)
>
> int irq; /* Device IRQ */
> void __iomem *ioaddr; /* Mapped address */
> --
> 1.9.0
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