diff options
| author | Peng Fan <[email protected]> | 2019-07-10 14:43:07 +0800 |
|---|---|---|
| committer | Peng Fan <[email protected]> | 2019-07-15 10:30:08 +0800 |
| commit | 44acd492480f8c8047326f3cb02d3e4d3760ecd0 (patch) | |
| tree | 903240d5b3fac9eacf60a5899ff655b67967f6c8 /include/stdio_dev.h | |
| parent | 8277171663084e20c0eca7c0b9681019f1a2a353 (diff) | |
mmc: support hs400 enhanced strobe mode
eMMC 5.1+ supports HS400 Enhances Strobe mode without the need for
tuning procedure.
The flow is as following:
- set HS_TIMIMG (Highspeed)
- Host change freq to <= 52Mhz
- set the bus width to Enhanced strobe and DDR8Bit(CMD6),
EXT_CSD[183] = 0x86 instead of 0x80
- set HS_TIMING to 0x3 (HS400)
- Host change freq to <= 200Mhz
- Host select HS400 enhanced strobe complete
Signed-off-by: Peng Fan <[email protected]>
Diffstat (limited to 'include/stdio_dev.h')
0 files changed, 0 insertions, 0 deletions