diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2016-06-24 12:19:34 +0200 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2016-06-29 16:48:29 +0200 |
| commit | fc14b7601e5ca587afd97936ef3fd599f4e9281c (patch) | |
| tree | 461266cfd3209e8356802c43c13a3caba33df052 /drivers | |
| parent | 70efa60d96c9f05d91d8875eee97446df7f9e877 (diff) | |
mmc: tegra: apalis-tk1: hack to make sd1 functional
Disable the external loopback and use the internal loopback as per
SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set to
0xfffd according to the TRM.
Enable card detect polling as we can't use SD1_CD# aka
SDMMC3_CLK_LB_OUT for now as it features some magic properties even
though the external loopback is disabled and the internal loopback used
as per SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set
to 0xfffd according to the TRM!
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Dominik Sliwa <dominik.sliwa@toradex.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci-tegra.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c index 311e003667c8..a37ecb6a8a55 100644 --- a/drivers/mmc/host/sdhci-tegra.c +++ b/drivers/mmc/host/sdhci-tegra.c @@ -1204,15 +1204,25 @@ static void tegra_sdhci_reset_exit(struct sdhci_host *host, u8 mask) /* External loopback is valid for sdmmc3 only */ if ((soc_data->nvquirks & NVQUIRK_DISABLE_EXTERNAL_LOOPBACK) && (tegra_host->instance == 2)) { +#ifdef CONFIG_MACH_APALIS_TK1 + /* + * Disable the external loopback and use the internal loopback as per + * SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set to + * 0xfffd according to the TRM. + */ +#else /* CONFIG_MACH_APALIS_TK1 */ if ((tegra_host->tuning_status == TUNING_STATUS_DONE) && (host->mmc->pm_flags & MMC_PM_KEEP_POWER)) { +#endif /* CONFIG_MACH_APALIS_TK1 */ misc_ctrl &= ~(1 << SDHCI_VNDR_MISC_CTRL_EN_EXT_LOOPBACK_SHIFT); +#ifndef CONFIG_MACH_APALIS_TK1 } else { misc_ctrl |= (1 << SDHCI_VNDR_MISC_CTRL_EN_EXT_LOOPBACK_SHIFT); } +#endif /* !CONFIG_MACH_APALIS_TK1 */ } sdhci_writel(host, misc_ctrl, SDHCI_VNDR_MISC_CTRL); @@ -3262,6 +3272,13 @@ out: SDHCI_TEGRA_DBG("%s: Freq tuning done\n", mmc_hostname(sdhci->mmc)); if (enable_lb_clk) { misc_ctrl = sdhci_readl(sdhci, SDHCI_VNDR_MISC_CTRL); +#ifdef CONFIG_MACH_APALIS_TK1 + /* + * Disable the external loopback and use the internal loopback + * as per SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits + * being set to 0xfffd according to the TRM. + */ +#else /* CONFIG_MACH_APALIS_TK1 */ if (err) { /* Tuning is failed and card will try to enumerate in * Legacy High Speed mode. So, Enable External Loopback @@ -3269,10 +3286,10 @@ out: */ misc_ctrl |= (1 << SDHCI_VNDR_MISC_CTRL_EN_EXT_LOOPBACK_SHIFT); - } else { + } else +#endif /* CONFIG_MACH_APALIS_TK1 */ misc_ctrl &= ~(1 << SDHCI_VNDR_MISC_CTRL_EN_EXT_LOOPBACK_SHIFT); - } sdhci_writel(sdhci, misc_ctrl, SDHCI_VNDR_MISC_CTRL); } return err; @@ -4321,6 +4338,17 @@ static int sdhci_tegra_probe(struct platform_device *pdev) host->mmc->pm_caps |= plat->pm_caps; host->mmc->pm_flags |= plat->pm_flags; +#ifdef CONFIG_MACH_APALIS_TK1 + /* + * Enable card detect polling as we can't use SD1_CD# aka + * SDMMC3_CLK_LB_OUT for now as it features some magic properties even + * though the external loopback is disabled and the internal loopback + * used as per SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits + * being set to 0xfffd according to the TRM! + */ + host->mmc->caps |= MMC_CAP_NEEDS_POLL; +#endif /* CONFIG_MACH_APALIS_TK1 */ + host->mmc->caps |= MMC_CAP_ERASE; /* enable 1/8V DDR capable */ host->mmc->caps |= MMC_CAP_1_8V_DDR; |