On 2 June 2015 at 09:09, Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx> wrote:
> This quirk is used for controllers that can only support 1.8V
> voltage but the peripheral hardware circuit has capability to
> support 3.3V voltage.
Which voltage are you referring to? The I/O voltage or the power to
the card? VCC or VCCQ?
Kind regards
Uffe
>
> Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 3 +++
> drivers/mmc/host/sdhci.h | 4 ++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index c80287a..40de0d3 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2959,6 +2959,9 @@ int sdhci_add_host(struct sdhci_host *host)
> host->caps1 :
> sdhci_readl(host, SDHCI_CAPABILITIES_1);
>
> + if (host->quirks2 & SDHCI_QUIRK2_CIRCUIT_SUPPORT_VS33)
> + caps[0] = caps[0] | SDHCI_CAN_VDD_330;
> +
> if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
> host->flags |= SDHCI_USE_SDMA;
> else if (!(caps[0] & SDHCI_CAN_DO_SDMA))
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index e639b7f..2704daf1 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -409,6 +409,10 @@ struct sdhci_host {
> #define SDHCI_QUIRK2_SUPPORT_SINGLE (1<<13)
> /* Controller broken with using ACMD23 */
> #define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14)
> +/* Controller only supports 1.8V, but the peripheral hardware
> + * circuit has capability to support 3.3V
> + */
> +#define SDHCI_QUIRK2_CIRCUIT_SUPPORT_VS33 (1<<15)
>
> int irq; /* Device IRQ */
> void __iomem *ioaddr; /* Mapped address */
> --
> 2.1.0.27.g96db324
>
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