Question

linux-4.9.337

configfs_init
mkdir: can't create directory '/sys/kernel/config/usb_gadget/haier/functions/ffs.adb': Device or resource busy
ln: /sys/kernel/config/usb_gadget/haier/configs/c.1/ffs.adb: No such file or directory
[    2.322098] read descriptors
[    2.325171] read strings
[    2.327919] g_ffs gadget: g_ffs ready
[    2.331723] dwc2 13500000.otg: bound driver g_ffs
[    2.336686] ------------[ cut here ]------------
[    2.341496] WARNING: CPU: 0 PID: 473 at drivers/usb/dwc2/gadget.c:224 dwc2_hsotg_init_fifo+0xd8/0x1ac
[    2.351060] insufficient fifo memory[    2.354584] Modules linked in:
[    2.357759] CPU: 0 PID: 473 Comm: adbd Not tainted 4.9.337+ #25
[    2.363894] Stack : 00000000 00000000 00000000 00000000 80558a5a 00000033 00000000 0000000b
[    2.372583]         800791d0 81ba836c 804e70c7 80554708 000000e0 00000000 80510000 00000001
[    2.381270]         814782e8 800791c4 80558a5a 00000012 00000000 00000000 80475da8 815adc9c
[    2.389974]         80478610 803e1858 000000e0 00000000 80510000 000001d9 815adc9c 804704e0
[    2.398663]         00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    2.407349]         ...
[    2.409884] Call Trace:
[    2.412424] [<8001f91c>] show_stack+0x70/0x8c
[    2.416950] [<803e2b28>] dump_stack+0x9c/0xd0
[    2.421470] [<803e1484>] __warn+0x110/0x118
[    2.425814] [<800347e4>] warn_slowpath_fmt+0x30/0x3c
[    2.430964] [<8027dc04>] dwc2_hsotg_init_fifo+0xd8/0x1ac
[    2.436476] [<8028072c>] dwc2_hsotg_core_init_disconnected+0x74/0x2a4
[    2.443157] [<80281334>] dwc2_hsotg_pullup+0x94/0xd4
[    2.448320] [<802884cc>] usb_gadget_connect+0x54/0x78
[    2.453564] [<802892a8>] udc_bind_to_driver+0xdc/0x118
[    2.458896] [<802897b0>] usb_gadget_probe_driver+0x148/0x158
[    2.464771] [<8028e3b0>] functionfs_ready_callback+0x4c/0x7c
[    2.470641] [<8028da98>] ffs_ep0_write+0x810/0x858
[    2.475611] [<800f9570>] vfs_write+0xcc/0x114
[    2.480129] [<800fa22c>] SyS_write+0x6c/0xd8
[    2.484560] [<80024b78>] syscall_common+0x34/0x58
[    2.489442] ---[ end trace 7f81c373d5b61bfc ]---
[    2.764380] dwc2 13500000.otg: new device is high-speed
[    2.844367] dwc2 13500000.otg: new device is high-speed
[    2.913543] dwc2 13500000.otg: new address 31
[    2.939888] g_ffs gadget: high-speed config #1: FunctionFS

Answer

        dr_mode = "otg";
+       g-np-tx-fifo-size = <32>;
+       g-rx-fifo-size = <256>;
+       g-tx-fifo-size = <512 512 512 512 512 768>;
+       g-tx-fifo-size = <512 512 512 512 512 256 256>;
        status = "okay";