PCIe missing on RK3399

[Vicente Bergas]

On Wed, Dec 11, 2024 at 2:36 PM Heiko Stübner <heiko at sntech.de> wrote:
>
> Hi Vicente,

Hi Heiko,
thanks for taking a look at it!

> Am Mittwoch, 11. Dezember 2024, 13:55:01 CET schrieb Vicente Bergas:
> > i've tested the Linux kernel 6.13-rc1 and rc2 and in both cases PCIe
> > is not detected on the RK3399 platform (rk3399-gru-kevin), whereas the
> > kernel version 6.12.3 works fine.
> >
> > 6.13 configuration is based on the same one as 6.12 and there aren't
> > any significant PCI-related differences.
> >
> > The messages from dmesg on 6.13 don't show any PCI-related errors.
> >
> > Does somebody know what is going on?
>
> so I just booted a rk3399-puma-haikou with a pci-nvme-adapter in the
> pcie slot. And I get:
>
> [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
> [    0.000000] Linux version 6.13.0-rc2-00101-g260ae63734ff-dirty (hstuebner at phil) (aarch64-linux-gnu-gcc (Debian 14.2.0-6) 14.2.0, GNU ld (GNU Binutils for Debian) 2.43.1) #1134 SMP PREEMPT Tue Dec 10 21:06:34 CET 2024
> ...
> [    3.428114] rockchip-pcie f8000000.pcie: host bridge /pcie at f8000000 ranges:
> [    3.435978] rockchip-pcie f8000000.pcie:      MEM 0x00fa000000..0x00fbdfffff -> 0x00fa000000
> [    3.445478] rockchip-pcie f8000000.pcie:       IO 0x00fbe00000..0x00fbefffff -> 0x00fbe00000
> [    3.455298] rockchip-pcie f8000000.pcie: using DT '/pcie at f8000000' for 'ep' GPIO lookup
>
> So there seems to be not some general failure.
>
> Does
>         # ls /sys/devices/platform/f8000000.pcie
> list some "waiting_for_supplies" or something?

yes, indeed there is such a file in there:

### 6.13-rc2
$ ls /sys/devices/platform/f8000000.pcie
power
driver_override
modalias
of_node
subsystem
supplier:platform:ff720000.gpio
supplier:platform:ff770000.syscon:pcie-phy
supplier:platform:ff780000.gpio
supplier:platform:pinctrl
supplier:platform:regulator-pp3300-wifi-bt
supplier:platform:regulator-wlan-pd-n
uevent
waiting_for_supplier

$ cat /sys/devices/platform/f8000000.pcie/waiting_for_supplier
1

### 6.12.3
$ ls /sys/devices/platform/f8000000.pcie
pci0000:00
power
driver
driver_override
modalias
of_node
subsystem
supplier:phy:phy-ff770000.syscon:pcie-phy.5
supplier:phy:phy-ff770000.syscon:pcie-phy.6
supplier:phy:phy-ff770000.syscon:pcie-phy.7
supplier:phy:phy-ff770000.syscon:pcie-phy.8
supplier:platform:ff770000.syscon:pcie-phy
supplier:platform:ff780000.gpio
supplier:platform:pinctrl
supplier:platform:pp3300-wifi-bt
supplier:platform:pp900-ap
supplier:platform:wlan-pd-n
supplier:regulator:regulator.17
supplier:regulator:regulator.23
supplier:regulator:regulator.25
uevent

What does that mean?

Regards,
  Vicente.