diff options
| author | Yangbo Lu <yangbo.lu@nxp.com> | 2020-05-19 11:06:44 +0800 |
|---|---|---|
| committer | Peng Fan <peng.fan@nxp.com> | 2020-06-15 09:45:22 +0800 |
| commit | c927d65873c7706f436ab59a78d44a0eb80fe939 (patch) | |
| tree | d3842f37f3043195eae78172d2458cde39fdc690 /include | |
| parent | 9abf648436b49553e6cb4a7f03a021720616d75b (diff) | |
mmc: fsl_esdhc: workaround for hardware 3.3v IO reliability issue
When eSDHC operates at 3.3v, damage can accumulate in an internal
level shifter at a higher than expected rate. The faster the interface
runs, the more damage accumulates. This issue now is found on LX2160A
eSDHC1 for only SD card.
The hardware workaround is recommended to use an on-board level shifter
that is 1.8v on SoC side and 3.3v on SD card side.
For boards without hardware workaround, this option could be enabled,
ensuring 1.8v IO voltage and disabling eSDHC if no card.
This option assumes no hotplug, and u-boot has to make all the way to
to linux to use 1.8v UHS-I speed mode if has card.
If you do not want the workaround for better user experience, of course
you can choose to not select it running eSDHC in unsafe mode.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/fsl_esdhc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h index 8e8cd2cc1a..e148eaa880 100644 --- a/include/fsl_esdhc.h +++ b/include/fsl_esdhc.h @@ -4,6 +4,7 @@ *------------------------------------------------------------------- * * Copyright 2007-2008,2010-2011 Freescale Semiconductor, Inc + * Copyright 2020 NXP */ #ifndef __FSL_ESDHC_H__ @@ -98,6 +99,7 @@ #define PROCTL_DTW_4 0x00000002 #define PROCTL_DTW_8 0x00000004 #define PROCTL_D3CD 0x00000008 +#define PROCTL_VOLT_SEL 0x00000400 #define CMDARG 0x0002e008 |