* [PATCH] ARM: dts: i.MX8MP: increase off-on delay on the SD Vcc regulator
@ 2022-11-01 13:30 Marco Felsch
2022-11-02 8:13 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Marco Felsch @ 2022-11-01 13:30 UTC (permalink / raw)
To: barebox
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>
---
arch/arm/dts/imx8mp-evk.dts | 4 ++++
1 file changed, 4 insertions(+)
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>;
--
2.30.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: dts: i.MX8MP: increase off-on delay on the SD Vcc regulator
2022-11-01 13:30 [PATCH] ARM: dts: i.MX8MP: increase off-on delay on the SD Vcc regulator Marco Felsch
@ 2022-11-02 8:13 ` Sascha Hauer
0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2022-11-02 8:13 UTC (permalink / raw)
To: Marco Felsch; +Cc: barebox
On Tue, Nov 01, 2022 at 02:30:50PM +0100, Marco Felsch wrote:
> 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>
> ---
> arch/arm/dts/imx8mp-evk.dts | 4 ++++
> 1 file changed, 4 insertions(+)
Applied, thanks
Sascha
>
> 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>;
> --
> 2.30.2
>
>
>
--
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Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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