The driver currently does not reset bit 5 of the hostctl register even if
the MMC stack requests it. Then means that once a bus width of 8 is
selected it is not possible to change it back to 1. This breaks
'mmc rescan' which needs to start off with a bus width of 1.
The problem was surfaced by enabling CONFIG_DM_MMC_OPS on tegra. Without
this option the MMC stack fully reinits the driver on a 'mmc rescan'.
But with this option driver model does not re-probe a driver once it has
been probed once.
Fix the driver to honour the request.
Signed-off-by: Simon Glass <s...@chromium.org>
---
drivers/mmc/tegra_mmc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index 338e42b528..7d945a172e 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -438,7 +438,7 @@ static int tegra_mmc_set_ios(struct udevice *dev)
else if (mmc->bus_width == 4)
ctrl |= (1 << 1);
else
- ctrl &= ~(1 << 1);
+ ctrl &= ~(1 << 1 | 1 << 5);
writeb(ctrl, &priv->reg->hostctl);
debug("mmc_set_ios: hostctl = %08X\n", ctrl);
--
2.13.0.506.g27d5fe0cd-goog
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