On 20/05/16 11:36, Shawn Lin wrote:
> Currently sdhci-arasan 5.1 can support enhanced strobe function,
> and we now limit it just for "arasan,sdhci-5.1". Add
> mmc-hs400-enhanced-strobe in DT to enable the function if we're
> sure our controller can support it.
>
> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
> Reviewed-by: Doug Anderson <dianders@xxxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
> drivers/mmc/host/sdhci-of-arasan.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index b6f4c1d..533e2bc 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -25,7 +25,9 @@
> #include "sdhci-pltfm.h"
>
> #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
> +#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
>
> +#define VENDOR_ENHANCED_STROBE BIT(0)
> #define CLK_CTRL_TIMEOUT_SHIFT 16
> #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT)
> #define CLK_CTRL_TIMEOUT_MIN_EXP 13
> @@ -79,6 +81,21 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
> }
> }
>
> +static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + u32 vendor;
> + struct sdhci_host *host = mmc_priv(mmc);
> +
> + vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
> + if (ios->enhanced_strobe)
> + vendor |= VENDOR_ENHANCED_STROBE;
> + else
> + vendor &= ~VENDOR_ENHANCED_STROBE;
> +
> + writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
> +}
> +
> static struct sdhci_ops sdhci_arasan_ops = {
> .set_clock = sdhci_arasan_set_clock,
> .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> @@ -245,6 +262,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
> dev_err(&pdev->dev, "phy_power_on err.\n");
> goto err_phy_power;
> }
> +
> + host->mmc_host_ops.hs400_enhanced_strobe =
> + sdhci_arasan_hs400_enhanced_strobe;
> }
>
> ret = sdhci_add_host(host);
>
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