[PATCH 2/2] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary

2021-04-09 Thread sbabic
> 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

Re: [PATCH 2/2] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary

2021-03-22 Thread Sean Anderson
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; +

Re: [PATCH 2/2] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary

2021-03-22 Thread Fabio Estevam
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

[PATCH 2/2] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary

2021-03-22 Thread haibo . chen
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