From: Matt Reimer Date: Thu, 19 Feb 2015 18:22:53 +0000 (-0700) Subject: mmc: sdhci: fix bus width switching on Samsung SoCs X-Git-Tag: v2015.04-rc3~30^2 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=f88a429f1179c9d9ab2883fba0ed0aa13c9bd72e;p=oweals%2Fu-boot.git mmc: sdhci: fix bus width switching on Samsung SoCs 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 --- diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c index de88e19609..82d7984a51 100644 --- a/drivers/mmc/sdhci.c +++ b/drivers/mmc/sdhci.c @@ -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;