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| author | Peng Fan <peng.fan@nxp.com> | 2019-07-10 14:43:07 +0800 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2019-07-15 10:30:08 +0800 |
| commit | 44acd492480f8c8047326f3cb02d3e4d3760ecd0 (patch) | |
| tree | 903240d5b3fac9eacf60a5899ff655b67967f6c8 /drivers/mmc/Kconfig | |
| parent | 8277171663084e20c0eca7c0b9681019f1a2a353 (diff) | |
| download | u-boot-44acd492480f8c8047326f3cb02d3e4d3760ecd0.zip u-boot-44acd492480f8c8047326f3cb02d3e4d3760ecd0.tar.gz u-boot-44acd492480f8c8047326f3cb02d3e4d3760ecd0.tar.bz2 | |
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 <peng.fan@nxp.com>
Diffstat (limited to 'drivers/mmc/Kconfig')
| -rw-r--r-- | drivers/mmc/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index a4a6a6c..890ef35 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -135,6 +135,18 @@ config SPL_MMC_UHS_SUPPORT cards. The IO voltage must be switchable from 3.3v to 1.8v. The bus frequency can go up to 208MHz (SDR104) +config MMC_HS400_ES_SUPPORT + bool "enable HS400 Enhanced Strobe support" + help + The HS400 Enhanced Strobe mode is support by some eMMC. The bus + frequency is up to 200MHz. This mode does not tune the IO. + +config SPL_MMC_HS400_ES_SUPPORT + bool "enable HS400 Enhanced Strobe support in SPL" + help + The HS400 Enhanced Strobe mode is support by some eMMC. The bus + frequency is up to 200MHz. This mode does not tune the IO. + config MMC_HS400_SUPPORT bool "enable HS400 support" select MMC_HS200_SUPPORT |