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| author | Jean-Jacques Hiblot <jjhiblot@ti.com> | 2019-07-02 10:53:53 +0200 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2019-07-15 10:16:49 +0800 |
| commit | cd0b80ec9c97bdd9fb6642671efad8ef3cb33858 (patch) | |
| tree | bc7e8387fdbcb8ecc01046ef8fdcf434e73b449a /post | |
| parent | 863d10044aae5ee40a9cf9a76aed62822cf45c30 (diff) | |
mmc: if possible, poll the busy state using DAT0
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>
Diffstat (limited to 'post')
0 files changed, 0 insertions, 0 deletions