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mmc: sdhci-esdhc-imx: manually reset MIX_CTRL for usdhc

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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>
This commit is contained in:
Shawn Guo 2013-01-21 19:02:25 +08:00 committed by Chris Ball
parent 69f5469822
commit 58c8c4fbdb
1 changed files with 8 additions and 1 deletions
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9
drivers/mmc/host/sdhci-esdhc-imx.c
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@ -318,8 +318,15 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
* circuit relies on. To work around it, we turn the clocks on back
* to keep card detection circuit functional.
*/
if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1))
if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) {
esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
/*
* The reset on usdhc fails to clear MIX_CTRL register.
* Do it manually here.
*/
if (is_imx6q_usdhc(imx_data))
writel(0, host->ioaddr + ESDHC_MIX_CTRL);
}
}
static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)