Tried latest desktop image[1]. USB-dw3 is enabled.
Here is the log:

u@tgl:~$ dmesg | grep 3fe
[   21.103681] pci 0000:00:0d.1: [8086:9a15] type 00 class 0x0c03fe
[   21.199707] pci 0000:00:14.1: [8086:43ee] type 00 class 0x0c03fe

u@tgl:~$ sudo modprobe dwc3_pci
u@tgl:~$ lspci -v
...
00:0d.1 USB controller: Intel Corporation Device 9a15 (rev 04) (prog-if fe [USB 
Device])
        Subsystem: Intel Corporation Device 7270
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at 607d200000 (64-bit, non-prefetchable) [size=2M]
        Memory at 607d4f1000 (64-bit, non-prefetchable) [size=4K]
        Capabilities: [80] Power Management version 3
        Capabilities: [90] Vendor Specific Information: Len=14 <?>
        Kernel driver in use: dwc3-pci
        Kernel modules: dwc3_pci
...
00:14.1 USB controller: Intel Corporation Device 43ee (prog-if fe [USB Device])
        Subsystem: Intel Corporation Device 7270
        Flags: fast devsel, IRQ 17
        Memory at 607d000000 (64-bit, non-prefetchable) [size=2M]
        Memory at 607d4ed000 (64-bit, non-prefetchable) [size=4K]
        Capabilities: [80] Power Management version 3
        Capabilities: [90] Vendor Specific Information: Len=14 <?>
        Kernel modules: dwc3_pci

u@tgl:~$ dpkg -l | grep linux-image
ii  linux-image-5.11.0-1012-intel              5.11.0-1012.14                   
     amd64        Signed kernel image generic
ii  linux-image-intel                          5.11.0.1012.15                   
     amd64        Generic Linux kernel image

---
[1] 
https://private-fileshare.canonical.com/~brian/iotg-focal-desktop-20210813.img

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https://bugs.launchpad.net/bugs/1929892

Title:
  [TGL] enable USB-dw3

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