[PATCH v10 0/4] This suspend patch is only support cut off the power of cpu and some external

Kevin Hilman khilman at kernel.org
Wed Dec 3 11:23:26 PST 2014

Chris Zhong <zyw at rock-chips.com> writes:


> I have test these patches on evb board base on next-20141128 with a
> defconfig[0], and with u-boot[1].
> As Doug said, we need below 3 patches for resume.
> 1.https://patchwork.kernel.org/patch/5051881/  - clocksource:
>    arch_timer: Allow the device tree to specify uninitialized timer
>    registers
> 2.https://patchwork.kernel.org/patch/5363671/  - clocksource:
>    arch_timer: Fix code to use physical timers when requested
> 3.https://patchwork.kernel.org/patch/5382141/  - ARM: dts: rk3288: add
>    arm,cpu-registers-not-fw-configured
> And it will auto wakeup, as Heiko said in v8.  

OK, with your series plus those 3 patches on top of next-20141128, I'm
now seeing it auto-wakeup, either with multi_v7_defconfig or Heiko's

> But I have never notice before, since the u-boot never enable edp, and
> I use the coreboot with edp display.  Actually it is a bug in rk3288,
> the rk3288 have not 27Mhz clock source, but the edp initially set to
> this non-existent clock. At this time, edp is working on a unknown
> state, and it always bring a interrupt, this interrupt avoid system
> enter suspend. 

I see, good find!

> So if we want to enter suspend normally, the
> edp_24m_sel(bit 15) of CRU_CLKSEL28_CON(0xff7600d0) must be set to 1.

I didn't try your u-boot fix, but it sounds like there should be a kernel
fix for this.  Why doesn't the disabling of unused clocks put the EDP
into a safe/disabled state?


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