Re: [PATCH 03/22] clk: sunxi: add "pll6" to sun6i protected clock list

Maxime Ripard
2014-05-27T08:35:13Z

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On Mon, May 26, 2014 at 12:47:30PM +0800, Chen-Yu Tsai wrote:
> On Mon, May 26, 2014 at 2:48 AM, Maxime Ripard
> <maxime.ripard@free-electrons.com> wrote:
> > On Fri, May 23, 2014 at 03:51:06PM +0800, Chen-Yu Tsai wrote:
> >> PLL6 is used by some important but undocumented module, most likely
> >> memory related, such as mbus or the actual memory controller. As we
> >> do not have a driver for that, add pll6 to the list of protected
> >> clocks, so that it won't be disabled and leave us with a non-responsive
> >> system.
> >
> > What issue have you seen?
>
> Completely unresponsive after PLL6 is gated (on the A23).
>
> > The system actually works pretty great on the A31.
>
> Does it work when there aren't any other PLL6 consumers?

Yes.

> Maybe the boot0 on A31 and A23 setup some DRAM-related modules differently.
>
> If the A31 works without protecting PLL6, I'll add a separate list
> for the A23.

Thanks!
Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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