Re: [U-Boot] [PATCH] mx6: Revert "mx6: soc: Disable VDDPU regulator"

On Thu, Jan 16, 2014 at 2:01 PM, Fabio Estevam festevam@gmail.com wrote:

On Thu, Jan 16, 2014 at 1:50 PM, Otavio Salvador otavio@ossystems.com.br wrote:

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It worked for you probably because you used the ldo bypass mode.

Yes; I did the bypass mode.

We currently don't do LDO bypass mode in mainline U-boot. We do it in FSL U-boot.

With LDO bypass, lower VDDARM and VDDSOC voltages can be supplied as per the mx6 datasheet.

I just measured with the scope and the VDDARM/SOC voltages supplied by the 3.10 FSL kernel are below the minimum for the LDO enabled case. So setting LDO bypass in U-boot 'fixes' the issue.

We can implement LDO bypass after 2014.01 is out, but for this release let's just revert the VDDPU disable patch.

Do you agree?

Yes I do.