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mmc: tegra: Implement HS400 enhanced strobe

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

Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Aapo Vienamo 2018-08-10 21:14:00 +03:00 committed by Ulf Hansson
parent f5313aaa92
commit dfc9700cef
1 changed files with 23 additions and 0 deletions
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23
drivers/mmc/host/sdhci-tegra.c
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@ -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;