diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2017-03-25 00:18:22 (GMT) |
|---|---|---|
| committer | Tom Warren <twarren@nvidia.com> | 2017-04-01 22:45:04 (GMT) |
| commit | 4119b7098c8ef83105946502bc7098dec67bd15d (patch) | |
| tree | 07a2386cf7bf20d8ac676f1eb5ebff87c8add303 /drivers/mmc | |
| parent | f38f5f4bcf8027041e8c5b9ea3bc1ae905510bc0 (diff) | |
| download | u-boot-fsl-qoriq-4119b7098c8ef83105946502bc7098dec67bd15d.tar.xz | |
mmc: tegra: allow disabling external clock loopback
Introduce CONFIG_TEGRA124_MMC_DISABLE_EXT_LOOPBACK to disable the external clock
loopback and use the internal one on SDMMC3 as per the 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>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/mmc/tegra_mmc.c | 16 |
2 files changed, 27 insertions, 0 deletions
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 05e0b10..560391f 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -367,6 +367,17 @@ config MMC_SUNXI endif +config TEGRA124_MMC_DISABLE_EXT_LOOPBACK + bool "Disable external clock loopback" + depends on MMC_SDHCI_TEGRA && TEGRA124 + help + Disable the external clock loopback and use the internal one on SDMMC3 + as per the SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits + being set to 0xfffd according to the TRM. + + TODO(marcel.ziswiler@toradex.com): Move to device tree controlled + approach once proper kernel integration made it mainline. + endmenu config SYS_FSL_ERRATUM_ESDHC111 diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c index 0df74ef..6c6affb 100644 --- a/drivers/mmc/tegra_mmc.c +++ b/drivers/mmc/tegra_mmc.c @@ -513,6 +513,22 @@ static int tegra_mmc_init(struct mmc *mmc) tegra_mmc_reset(priv, mmc); +#if defined(CONFIG_TEGRA124_MMC_DISABLE_EXT_LOOPBACK) + /* + * Disable the external clock loopback and use the internal one on + * SDMMC3 as per the SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 + * bits being set to 0xfffd according to the TRM. + * + * TODO(marcel.ziswiler@toradex.com): Move to device tree controlled + * approach once proper kernel integration made it mainline. + */ + if (priv->reg == (void *)0x700b0400) { + mask = readl(&priv->reg->venmiscctl); + mask &= ~TEGRA_MMC_MISCON_ENABLE_EXT_LOOPBACK; + writel(mask, &priv->reg->venmiscctl); + } +#endif + priv->version = readw(&priv->reg->hcver); debug("host version = %x\n", priv->version); |