[U-Boot] [PATCH 2/2] rockchip: rk3399: rockpro64: enable force power on reset workaround

Lee Jones lee.jones at linaro.org
Thu May 19 19:23:15 CEST 2022 

On Thu, 19 May 2022, Lee Jones wrote:

> On Thu, 19 May 2022, Peter Geis wrote:
> 
> > On Thu, May 19, 2022 at 11:47 AM Lee Jones <lee.jones at linaro.org> wrote:
> > >
> > > On Thu, 19 May 2022, Lee Jones wrote:
> > >
> > > > On Thu, 19 May 2022, Peter Geis wrote:
> > > >
> > > > > On Thu, May 19, 2022 at 10:56 AM Lee Jones <lee.jones at linaro.org> wrote:
> > > > > >
> > > > > > > > > > It's not clear how this issue (present 3 years ago) was finally
> > > > > > > > > > resolved.  From the thread, it looks as if the fix might have made its
> > > > > > > > > > way into ATF, but I'm 87.6% sure ATF is not running on this platform
> > > > > > > > > > (yet).
> > > > > > > > >
> > > > > > > > > The rk3399 SoC has a hardware bug where the power domains are not
> > > > > > > > > reset upon a soft reset. This leads to situations like this one where
> > > > > > > > > power domains are shut down during shutdown but aren't restored on
> > > > > > > > > reboot.
> > > > > > > >
> > > > > > > > I assume this isn't something we can patch in the kernel driver?
> > > > > > >
> > > > > > > As far as I know it's being worked on by others, I have some ideas for
> > > > > > > this as well but I've been focused on rk356x lately.
> > > > > >
> > > > > > Thanks for the update.
> > > > > >
> > > > > > > > > Mainline TF-A was patched to force all power domains online
> > > > > > > > > when a soft reboot is triggered, which solved that issue.
> > > > > > > >
> > > > > > > > Okay, this is what I figured.
> > > > > > > >
> > > > > > > > > What particular issues are you having initializing modern u-boot on
> > > > > > > > > this device?
> > > > > > > >
> > > > > > > > This is the output: https://pastebin.ubuntu.com/p/d5DmsSBnrR/
> > > > > > > >
> > > > > > > > Speaking with one of the guys who supports RockPi 4 in AOSP, he
> > > > > > > > suspects the DDR settings.  Apparently settings for older SoCs
> > > > > > > > sometimes get clobbered when support for newer SoCs is added.
> > > > > > >
> > > > > > > The rk3399 TPL code is specific to the rk3399 and it really hasn't
> > > > > > > been touched much recently. I'm using the latest Mainline U-Boot on
> > > > > > > both my Rockpro64 and Pinephone-Pro. I don't see TF-A being loaded,
> > > > > > > which should happen between:
> > > > > > >
> > > > > > > Trying to boot from BOOTROM
> > > > > > > Returning to boot ROM...
> > > > > > >
> > > > > > > Otherwise it just looks like the TPL code doesn't like being in a
> > > > > > > single channel configuration. Does the 2GB model just forgo the second
> > > > > > > ram chip? Or is this actually a 4GB model and it isn't detecting the
> > > > > > > second chip in both downstream and mainline? Could you include the
> > > > > > > TPL/SPL portion of downstream's output?
> > > > > >
> > > > > > TPL/SPL are mostly silent on the downstream build:
> > > > > >
> > > > > > https://pastebin.ubuntu.com/p/m2bBdjF8Wq/
> > > > > >
> > > > > > Not sure if it helps at all, but ArmBian is pretty noisy:
> > > > > >
> > > > > > https://pastebin.ubuntu.com/p/fdPjmmqBDM/
> > > > >
> > > > > Weird that downstream and mainline are being built with none of the
> > > > > debug stuff enabled. Armbian clearly shows the initial setup occuring
> > > > > correctly, and that it's a 4GB board. It's using both the Rockchip
> > > > > miniloader with a Rockchip TF-A blob as well.
> > > > >
> > > > > >
> > > > > > > > I am yet to investigate the u-boot story in any detail.
> > > > > > > >
> > > > > > > > It's on my TODO list for today.
> > > > > > > >
> > > > > > > > > Is there a particular reason it isn't using Mainline TF-A?
> > > > > > > >
> > > > > > > > We're not using Trusted Firmware yet.
> > > > > > >
> > > > > > > This platform does not work at all without TF-A. Optee is optional.
> > > > > > > Either you are using the downstream blob from Rockchip or Mainline
> > > > > > > built yourself. Personally I prefer using Mainline everything. If you
> > > > > > > build Mainline U-Boot without TF-A it will throw a warning at the end
> > > > > > > that says the created binary is non-functional.
> > > > > >
> > > > > > Right.  Played a lot with this today.
> > > > > >
> > > > > > Our build was using TF-A which was built-in to the primary loader.
> > > > > >
> > > > > > I had 2 interesting results today.  No idea how to explain them.
> > > > > >
> > > > > > First one was with Mainline u-boot and Mainline TF-A, which found, but
> > > > > > was seemingly unable to boot the kernel:
> > > > > >
> > > > > > https://pastebin.ubuntu.com/p/9HRhPyfjYK/
> > > > > >
> > > > > > The second interesting result I had was using our downstream u-boot
> > > > > > with Mainline TF-A.  It booted perfectly from cold, but managed to get
> > > > > > stuck in the TPL on soft reboot in a very similar way to the one I
> > > > > > reported earlier when not booting with TF-A ("Channel 1: col error"):
> > > > >
> > > > >
> > > > > Mainline TF-A defaults to 115200 for its uart messages, so you need to
> > > > > either A. pass the uart config from U-Boot to TF-A with a platform
> > > > > config option (unreliable in my experience), B. change U-Boot to
> > > > > 115200, or C. change TF-A to 1.5M (the path I take). Your mainline
> > > >
> > > > Hopefully this is enough:
> > > >
> > > > diff --git a/plat/rockchip/rk3399/rk3399_def.h b/plat/rockchip/rk3399/rk3399_def.h
> > > > index ba83242eb..24ad94ae7 100644
> > > > --- a/plat/rockchip/rk3399/rk3399_def.h
> > > > +++ b/plat/rockchip/rk3399/rk3399_def.h
> > > > @@ -17,7 +17,8 @@
> > > >  /**************************************************************************
> > > >   * UART related constants
> > > >   **************************************************************************/
> > > > -#define RK3399_BAUDRATE                        115200
> > > > +//#define RK3399_BAUDRATE                      115200
> > > > +#define RK3399_BAUDRATE                        1500000
> > > >  #define RK3399_UART_CLOCK              24000000
> > > >
> > > >  /******************************************************************************
> > 
> > Yes, that is sufficient.

That's interesting.  Would this change result in me now being able to
see the console output from this (apparently) failed attempt:

https://pastebin.ubuntu.com/p/9HRhPyfjYK/

However the result is the same as the downstream kernel where it
fails in the TPL on soft reboot:

https://pastebin.ubuntu.com/p/TZBYqTMCnN/

No TF-A messages seen though still.

Is it possible that u-boot only runs TF-A on cold boot?  Seems odd.

What was the extra logging you mentioned before?

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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