Re: [BUG] rk3399 fails to reboot correctly with PCIE device inserted

[Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>]

Hi Peter,

On 25/11/2019 4:28 pm, Peter Geis wrote:
> Good Morning,
> 
> Another issue I've come across while testing PCIE on the rockpro64.
> When a PCIE device is inserted into the board, and it enumerates
> successfully, the board will not reset.
> I've tried various states of u-boot-rockchip, u-boot-mainline, with
> both miniloader and TPL/SPL.

In case it's relevant, what particular PCIe device(s) have you seen the 
issue with? FWIW I've been running a Samsung 960 Evo NVMe in my 
NanoPC-T4 with mainline kernels for months now and it's always rebooted 
flawlessly.

Robin.

> With miniloader and both variants of u-boot, if you attempt a reboot
> it never fires the "reboot: Restarting system" message.
> If you trigger a sysrq reboot at this stage, it will reboot, but fails
> to start up the two a72 cores and subsequently hangs a second later
> when it loads the first dma driver.
> 
> With TPL/SPL on mainline-u-boot (I can't get rockchip-u-boot to work
> with TPL/SPL), it fires the "reboot: Restarting system" message, but
> never reboots.
> sysrq does not function at this point.
> 
> I believe the pcie controller is not being halted, and gets stuck in a
> loop with the two a72 cores.
> 
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