Enable PCIE function in Android12 BSP on i.MX8MM EVK

[#1]

Background

PCIe interface of Android 12 prebuilt and Built image on iMX8MM mini is not coming up.

The Android BSP doesn't enable the pcie driver.

Solution

1. imx8mm_gki.fragment

CONFIG_PHY_FSL_IMX_PCIE=m
CONFIG_PCI_IMX6=m

2. device/nxp/imx8m/evk_8mm/SharedBoardConfig.mk

$(KERNEL_OUT)/drivers/pci/controller/dwc/pci-imx6.ko \

Result

evk_8mm:/ # dmesg | grep pci
[    0.561609] ehci-pci: EHCI PCI platform driver
[    6.515345] imx6q-pcie 33800000.pcie: supply epdev_on not found, using dummy regulator
[    6.524925] imx6q-pcie 33800000.pcie: EXT REF_CLK is used!.
[    6.560211] imx6q-pcie 33800000.pcie: PCIe PLL locked after 20 us.
[    6.567328] imx6q-pcie 33800000.pcie: host bridge /soc@0/pcie@33800000 ranges:
[    6.584463] imx6q-pcie 33800000.pcie:       IO 0x001ff80000..0x001ff8ffff -> 0x0000000000
[    6.593833] imx6q-pcie 33800000.pcie:      MEM 0x0018000000..0x001fefffff -> 0x0018000000
[    6.603140] imx6q-pcie 33800000.pcie: invalid resource
[    6.708123] imx6q-pcie 33800000.pcie: Link up
[    6.713393] imx6q-pcie 33800000.pcie: Link up
[    6.718586] imx6q-pcie 33800000.pcie: Link up, Gen1
[    6.832372] imx6q-pcie 33800000.pcie: PCI host bridge to bus 0000:00
[    6.840023] pci_bus 0000:00: root bus resource [bus 00-ff]
[    6.846535] pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
[    6.853805] pci_bus 0000:00: root bus resource [mem 0x18000000-0x1fefffff]
[    6.861601] pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400
[    6.868529] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x000fffff]
[    6.876439] pci 0000:00:00.0: reg 0x38: [mem 0x00000000-0x0000ffff pref]
[    6.884101] pci 0000:00:00.0: supports D1
[    6.888954] pci 0000:00:00.0: PME# supported from D0 D1 D3hot D3cold
[    6.899174] pci 0000:01:00.0: [1b4b:2b42] type 00 class 0x020000
[    6.906127] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x000fffff 64bit pref]
[    6.914221] pci 0000:01:00.0: reg 0x18: [mem 0x00000000-0x000fffff 64bit pref]
[    6.922740] pci 0000:01:00.0: supports D1 D2
[    6.927854] pci 0000:01:00.0: PME# supported from D0 D1 D3hot D3cold
[    6.935200] pci 0000:01:00.0: 2.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x1 link at 0000:00:00.0 (capable of 4.000 Gb/s with 5.0 GT/s PCIe x1 link)
[    6.962608] pci 0000:00:00.0: BAR 0: assigned [mem 0x18000000-0x180fffff]
[    6.970251] pci 0000:00:00.0: BAR 15: assigned [mem 0x18100000-0x182fffff pref]
[    6.978426] pci 0000:00:00.0: BAR 6: assigned [mem 0x18300000-0x1830ffff pref]
[    6.986479] pci 0000:01:00.0: BAR 0: assigned [mem 0x18100000-0x181fffff 64bit pref]
[    7.001517] pci 0000:01:00.0: BAR 2: assigned [mem 0x18200000-0x182fffff 64bit pref]
[    7.010203] pci 0000:00:00.0: PCI bridge to [bus 01-ff]
[    7.016271] pci 0000:00:00.0:   bridge window [mem 0x18100000-0x182fffff pref]
[    7.025830] pcieport 0000:00:00.0: PME: Signaling with IRQ 238
[    7.033786] pcieport 0000:00:00.0: AER: enabled with IRQ 238