> From: Haibo Chen
> Some board like imx8mm-evkb, IO voltage switch from 3.3v to 1.8v need
> around 18ms, common code only delay 10ms, so need to delay extra 8ms.
> Otherwise voltage switch will timeout when wait for data0 line.
> This IO voltage switch time depends on board design, depend on the
On 3/22/21 8:04 AM, Fabio Estevam wrote:
Hi Haibo,
On Mon, Mar 22, 2021 at 8:09 AM wrote:
--- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
@@ -102,6 +102,7 @@
u-boot,dm-spl;
sd-uhs-sdr104;
sd-uhs-ddr50;
+
Hi Haibo,
On Mon, Mar 22, 2021 at 8:09 AM wrote:
> --- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi
> +++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
> @@ -102,6 +102,7 @@
> u-boot,dm-spl;
> sd-uhs-sdr104;
> sd-uhs-ddr50;
> + fsl,signal-voltage-switch-extra-delay-ms = <8>;
How
From: Haibo Chen
Some board like imx8mm-evkb, IO voltage switch from 3.3v to 1.8v need
around 18ms, common code only delay 10ms, so need to delay extra 8ms.
Otherwise voltage switch will timeout when wait for data0 line.
This IO voltage switch time depends on board design, depend on the
PMIC
4 matches
Mail list logo