Re: [PATCH 0/3] ARM: dts: AM43x: Fix DCDC3 regulator voltage

[Keerthy <a0393675@ti.com>]

On Friday 07 November 2014 10:56 AM, Keerthy wrote:
> On Friday 07 November 2014 12:59 AM, Robert Nelson wrote:
>> On Thu, Nov 6, 2014 at 12:25 PM, Tony Lindgren <tony@atomide.com> wrote:
>>> * Keerthy <j-keerthy@ti.com> [141106 02:55]:
>>>> Fix DCDC3 volatge to 1.5V which is the right value to be supplied by
>>>> DCDC3 for all the boards.
>>> Hmm so what about the comments for similar beaglebone changes
>>> in thread "[PATCH] ARM: dts: am335x-boneblack: set dcdc1 regulator
>>> for 1.35v ddr3"?
>> Based on Keerthy's patchset, i think we should just ignore my "1.35v"
>> ddr3 patch for the beaglebone black. As by default it will be at
>> 1.50v. (so we can either define it for clarity at 1.50v or just ignore
>> it.)
>>
>> Keerthy,
>>
>> Are you guys seeing these same ddr lockups if u-boot correctly set's
>> the 1.35v level first? Or should we just really leave it at the
>> default power on voltage level? (till either u-boot or kernel grows
>> the capabilities to correctly tell the ddr3 we are changing it's
>> voltage.)
>
> Robert,
>
> In our case even u-boot lets it to be at 1.5V. The problem is
> when the regulators are registered we try to set it 1.35V since
> that is what we are passing from device tree. I see lock up
> on the latest boards we have.

The issue is seen when we are executing from DDR and the voltage is changed
(in our case lowered) on the fly.

>
> Regards,
> Keerthy
>
>
>>
>> Regards,
>>
>