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Commit dfc9700c authored by Aapo Vienamo's avatar Aapo Vienamo Committed by Ulf Hansson
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mmc: tegra: Implement HS400 enhanced strobe 



Implement eMMC HS400 enhanced strobe. Enhanced strobe is an alternative
mechanism to the HS400 tuning procedure.

Signed-off-by: default avatarAapo Vienamo <avienamo@nvidia.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Acked-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent f5313aaa

drivers/mmc/host/sdhci-tegra.c

+23 −0
Original line number Diff line number Diff line
@@ -43,6 +43,9 @@ 
#define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE		BIT(3)

#define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE	BIT(2)



#define SDHCI_TEGRA_VENDOR_SYS_SW_CTRL			0x104

#define SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE		BIT(31)



#define SDHCI_TEGRA_VENDOR_CAP_OVERRIDES		0x10c

#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_MASK		0x00003f00

#define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT	8
@@ -294,6 +297,23 @@ static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap) 
	}

}



static void tegra_sdhci_hs400_enhanced_strobe(struct mmc_host *mmc,

					      struct mmc_ios *ios)

{

	struct sdhci_host *host = mmc_priv(mmc);

	u32 val;



	val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL);



	if (ios->enhanced_strobe)

		val |= SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE;

	else

		val &= ~SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE;



	sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_SYS_SW_CTRL);



}



static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask)

{

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -996,6 +1016,9 @@ static int sdhci_tegra_probe(struct platform_device *pdev) 
				sdhci_tegra_start_signal_voltage_switch;

	}



	host->mmc_host_ops.hs400_enhanced_strobe =

			tegra_sdhci_hs400_enhanced_strobe;



	rc = mmc_of_parse(host->mmc);

	if (rc)

		goto err_parse_dt;