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author | Marco Felsch <m.felsch@pengutronix.de> | 2022-11-01 14:30:50 +0100 |
---|---|---|
committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-11-02 09:13:33 +0100 |
commit | 7cd09654dcb821901bc4ffbd63a31efd48d806a3 (patch) | |
tree | 1dab86fc7f8860ca12b1d2db5b92a7095f88eb20 | |
parent | 1f57cc8f01c91a81b0ed7859614ea3290013e909 (diff) | |
download | barebox-7cd09654dcb821901bc4ffbd63a31efd48d806a3.tar.gz barebox-7cd09654dcb821901bc4ffbd63a31efd48d806a3.tar.xz |
ARM: dts: i.MX8MP: increase off-on delay on the SD Vcc regulator
This commit is required to fix the SD card detection mechanism. Without
this commit the SD card (auto-)detection fails when booted from this
sd-card:
mmc1: Query interface conditions failed: -110
mmc1: SD operation condition set timed out
The commit is ported from U-Boot:
| commit 247bbeb74c186963d9365db3136d0285618bd9a7
| Author: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
| Date: Sat Dec 5 17:29:17 2020 +0000
|
| ARM: dts: imx8m: increase off-on delay on the SD Vcc regulator
|
| Some SD Card controller and power circuitry has increased capacitance,
| which keeps the internal logic remains powered after regulator is switch
| off. This is generally the case when card is switched to SD104 mode,
| where a power cycle should be performed. In case if the card internal
| logic remains powered, it causes a subsequent failure of mode
| transition, effectively leading to failed enumeration.
|
| Introduce a delay of 20 msec in order to provide a possibility for
| internal card circuitry to drain voltages and perform a power cycle
| correctly.
|
| Similar fix is done in commit c49d0ac38a76 ("ARM: dts: rmobile: Increase
| off-on delay on the SD Vcc regulator") targeted Renesas SOCs.
|
| Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
| Cc: Stefano Babic <sbabic@denx.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.barebox.org/20221101133050.687403-1-m.felsch@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | arch/arm/dts/imx8mp-evk.dts | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/dts/imx8mp-evk.dts b/arch/arm/dts/imx8mp-evk.dts index 3264ade4b8..77b438287c 100644 --- a/arch/arm/dts/imx8mp-evk.dts +++ b/arch/arm/dts/imx8mp-evk.dts @@ -35,6 +35,10 @@ reset-deassert-us = <100000>; }; +®_usdhc2_vmmc { + off-on-delay-us = <20000>; +}; + &usdhc2 { #address-cells = <1>; #size-cells = <1>; |