Hi Fabio,
Hi Peng,
On Mon, Apr 15, 2019 at 10:33 PM Peng Fan peng.fan@nxp.com wrote:
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
This is actually a resend of https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatc
hwork.ozlabs.org%2Fpatch%2F1018188%2F&data=02%7C01%7Cpeng.fa n%40nx
p.com%7C49da3f56664f4651249e08d6c20c0a55%7C686ea1d3bc2b4c6fa92c d99c5c3
01635%7C0%7C0%7C636909754297976230&sdata=ENHPWHJbIZYQPgB 92hbNTROiA
TEML7yYJMNGxHwtHkw%3D&reserved=0 which got no response. Rebased on master.
drivers/mmc/Kconfig | 12 ++++++++ drivers/mmc/mmc-uclass.c | 15 +++++++++ drivers/mmc/mmc.c | 79
+++++++++++++++++++++++++++++++++++++++++++++++-
include/mmc.h | 15 +++++++++ 4 files changed, 120 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 04a4e7716f..3ef7580a43 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -111,6 +111,18 @@ 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"helpThe HS400 Enhanced Strobe mode is support by some eMMC.The bus frequency is up to
200MHz. This mode does not tune the IO.Is there any board that can select this option?
This patch is just a resend which got no response since first posted in 2018/12.
The support on i.MX8 will be posted, if there is no major comments on the common code part.
Thanks, Peng.
Otherwise it will be just dead code.
Thanks