mmc: sdhci-esdhc-imx: manually reset MIX_CTRL for usdhc
It's another violation to SDHC spec that software reset on usdhc does not reset MIX_CTRL register. Have to do it manually, otherwise the preserving of the register bits (e.g. AC23EN) may cause mmc card fail to be initialized. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Tested-by: Dirk Behme <dirk.behme@de.bosch.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -318,8 +318,15 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
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* circuit relies on. To work around it, we turn the clocks on back
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* to keep card detection circuit functional.
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*/
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if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1))
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if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) {
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esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
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/*
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* The reset on usdhc fails to clear MIX_CTRL register.
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* Do it manually here.
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*/
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if (is_imx6q_usdhc(imx_data))
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writel(0, host->ioaddr + ESDHC_MIX_CTRL);
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}
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}
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static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
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