[U-Boot] [PATCH] mmc: sdhci: fix bus width switching on Samsung SoCs

[Matt Reimer]

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 at sdgsystems.com>
---
 drivers/mmc/sdhci.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index de88e19..82d7984 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;
-- 
1.7.9.5