Hi, i noticed more fallout connected to the recent fw_devlink changes in Linux 5.13. Since fw_devlink=on the Raspberry Pi 3 B Plus (multi_v7_defconfig, 32 bit) is unable to boot from USB because the dwc2 driver probe too late and the kernel waits endlessly for the rootfs. Switching fw_devlink back to permissive makes the dwc2 driver probe earlier and make USB mass storage boot work again. Here are some dmesg extracts taken from a Raspberry Pi 3 B Plus (5.13, multi_v7_defconfig, booting from SD card to show good and bad case): fw_devlink=permissive [ 2.198105] calling dwc2_platform_driver_init+0x0/0x10 @ 1 [ 2.198663] initcall dwc2_platform_driver_init+0x0/0x10 returned 0 after 529 usecs [ 4.156494] dwc2 3f980000.usb: supply vusb_d not found, using dummy regulator [ 4.174514] dwc2 3f980000.usb: supply vusb_a not found, using dummy regulator [ 4.242973] dwc2 3f980000.usb: DWC OTG Controller [ 4.259505] dwc2 3f980000.usb: new USB bus registered, assigned bus number 1 [ 4.278483] dwc2 3f980000.usb: irq 66, io mem 0x3f980000 [ 4.759700] usb 1-1: new high-speed USB device number 2 using dwc2 [ 5.359793] usb 1-1.1: new high-speed USB device number 3 using dwc2 [ 5.899703] usb 1-1.2: new low-speed USB device number 4 using dwc2 [ 6.149705] usb 1-1.1.3: new low-speed USB device number 5 using dwc2 [ 6.629761] usb 1-1.1.1: new high-speed USB device number 6 using dwc2 fw_devlink=on [ 2.198579] calling dwc2_platform_driver_init+0x0/0x10 @ 1 [ 2.199021] initcall dwc2_platform_driver_init+0x0/0x10 returned 0 after 416 usecs [ 7.693987] dwc2 3f980000.usb: supply vusb_d not found, using dummy regulator [ 7.694228] dwc2 3f980000.usb: supply vusb_a not found, using dummy regulator [ 7.747111] dwc2 3f980000.usb: DWC OTG Controller [ 7.747152] dwc2 3f980000.usb: new USB bus registered, assigned bus number 1 [ 7.747192] dwc2 3f980000.usb: irq 66, io mem 0x3f980000 [ 8.179985] usb 1-1: new high-speed USB device number 2 using dwc2 [ 8.749920] usb 1-1.1: new high-speed USB device number 3 using dwc2 [ 9.179900] usb 1-1.2: new low-speed USB device number 4 using dwc2 [ 9.409951] usb 1-1.1.3: new low-speed USB device number 5 using dwc2 [ 9.849927] usb 1-1.1.1: new high-speed USB device number 6 using dwc2 Unfortunately i wasn't able to find the root cause for this delay of 3 seconds during boot. I noticed that usb_phy_generic_init is called very late. Maybe this is related. Best regards Stefan
