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mmc: sdhci: fix bus width switching on Samsung SoCs

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Fix bus width switching from 8-bit mode down to 4-bit or 1-bit modes on
Samsung SoCs using SDHCI_QUIRK_USE_WIDE8.  These SoCs report controller
version 2.0 yet they support 8-bit bus widths.  If 8-bit mode was
previously enabled and then an operation like "mmc dev" caused a switch
back down to 4-bit or 1-bit mode, WIDE8 was left set, causing failures.

This problem was manifested by "mmc dev" timing out.

Signed-off-by: Matt Reimer <mreimer@sdgsystems.com>
This commit is contained in:
Matt Reimer 2015-02-19 11:22:53 -07:00 • committed by Pantelis Antoniou
parent 34dd928492
commit f88a429f11
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/sdhci.c
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@ -374,7 +374,8 @@ static void sdhci_set_ios(struct mmc *mmc)
(host->quirks & SDHCI_QUIRK_USE_WIDE8))
ctrl |= SDHCI_CTRL_8BITBUS;
} else {
if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)
if ((SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300) ||
(host->quirks & SDHCI_QUIRK_USE_WIDE8))
ctrl &= ~SDHCI_CTRL_8BITBUS;
if (mmc->bus_width == 4)
ctrl |= SDHCI_CTRL_4BITBUS;