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mmc: tegra: Disable card clock during pad calibration

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Disable the card clock during automatic pad drive strength calibration
and re-enable it afterwards.

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 18:06:16 +03:00 committed by Ulf Hansson
parent 212b0cf141
commit 887bda8f21
1 changed files with 26 additions and 0 deletions
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26
drivers/mmc/host/sdhci-tegra.c
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@ -260,11 +260,35 @@ static void tegra_sdhci_configure_cal_pad(struct sdhci_host *host, bool enable)
usleep_range(1, 2);
}
static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable)
{
bool status;
u32 reg;
reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
status = !!(reg & SDHCI_CLOCK_CARD_EN);
if (status == enable)
return status;
if (enable)
reg |= SDHCI_CLOCK_CARD_EN;
else
reg &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
return status;
}
static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
{
bool card_clk_enabled;
u32 reg;
int ret;
card_clk_enabled = tegra_sdhci_configure_card_clk(host, false);
tegra_sdhci_configure_cal_pad(host, true);
reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
@ -279,6 +303,8 @@ static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
tegra_sdhci_configure_cal_pad(host, false);
tegra_sdhci_configure_card_clk(host, card_clk_enabled);
if (ret)
dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n");
}