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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>
This commit is contained in:
Aapo Vienamo 2018-08-30 18:06:13 +03:00 committed by Ulf Hansson
parent 86ac2f8bf9
commit e7c071489e
1 changed files with 17 additions and 5 deletions
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22
drivers/mmc/host/sdhci-tegra.c
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@ -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;
mdelay(1);
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);
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);
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);
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)