mmc: tegra: Poll for calibration completion

#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>

#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)

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)