diff options
| author | Aapo Vienamo <avienamo@nvidia.com> | 2018-08-30 18:06:13 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-10-08 12:40:43 +0300 |
| commit | e7c071489ecc3d1bd8e24086fc617b23ea0adb34 (patch) | |
| tree | 6942f3013283e5fcd10676a75c7ebc27835330ff /drivers/mmc | |
| parent | 86ac2f8bf90a7fe0381794bebf7c287e6333f65d (diff) | |
| download | linux-e7c071489ecc3d1bd8e24086fc617b23ea0adb34.tar.xz | |
mmc: tegra: Poll for calibration completion
Implement polling with 10 ms timeout for automatic pad drive strength
calibration.
Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-tegra.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c index 11185e96f3c3..56b637c5b594 100644 --- a/drivers/mmc/host/sdhci-tegra.c +++ b/drivers/mmc/host/sdhci-tegra.c @@ -16,6 +16,7 @@ #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/iopoll.h> #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/io.h> @@ -50,6 +51,9 @@ #define SDHCI_AUTO_CAL_START BIT(31) #define SDHCI_AUTO_CAL_ENABLE BIT(29) +#define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec +#define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31) + #define NVQUIRK_FORCE_SDHCI_SPEC_200 BIT(0) #define NVQUIRK_ENABLE_BLOCK_GAP_DET BIT(1) #define NVQUIRK_ENABLE_SDHCI_SPEC_300 BIT(2) @@ -226,13 +230,21 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) static void tegra_sdhci_pad_autocalib(struct sdhci_host *host) { - u32 val; + u32 reg; + int ret; + + reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); + reg |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; + sdhci_writel(host, reg, SDHCI_TEGRA_AUTO_CAL_CONFIG); - mdelay(1); + usleep_range(1, 2); + /* 10 ms timeout */ + ret = readl_poll_timeout(host->ioaddr + SDHCI_TEGRA_AUTO_CAL_STATUS, + reg, !(reg & SDHCI_TEGRA_AUTO_CAL_ACTIVE), + 1000, 10000); - val = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG); - val |= SDHCI_AUTO_CAL_ENABLE | SDHCI_AUTO_CAL_START; - sdhci_writel(host,val, SDHCI_TEGRA_AUTO_CAL_CONFIG); + if (ret) + dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n"); } static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) |