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mmc: if possible, poll the busy state using DAT0

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Using the DAT0 line as a rdy/busy line is an alternative to reading the
status register of the card. It especially useful in situation where the
bus is not in a good shape, like when modes are switched.
This is also how the linux driver behaves.

Note of warning: As per the specification, while polling on DAT0 the CLK
must not turned off: "[...] Without a clock edge the Device (unless
previously disconnected by a deselect command (CMD7)) will force the DAT0
line down, forever. [...]"

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
This commit is contained in:
Jean-Jacques Hiblot
2019-07-02 10:53:53 +02:00
committed by Peng Fan
parent 863d10044a
commit cd0b80ec9c
3 changed files with 4 additions and 6 deletions
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2
drivers/mmc/mmc-uclass.c
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@@ -47,7 +47,6 @@ int mmc_set_ios(struct mmc *mmc)
return dm_mmc_set_ios(mmc->dev);
}
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
int dm_mmc_wait_dat0(struct udevice *dev, int state, int timeout)
{
struct dm_mmc_ops *ops = mmc_get_ops(dev);
@@ -61,7 +60,6 @@ int mmc_wait_dat0(struct mmc *mmc, int state, int timeout)
{
return dm_mmc_wait_dat0(mmc->dev, state, timeout);
}
#endif
int dm_mmc_get_wp(struct udevice *dev)
{