Failed to enumerate device with TinyUSB ran in MIPS SOC.

[wangtao13]

I just integrated the latest TinyUSB to my SOC product.
The SOC is a MIPs32 (single core), it uses OTG and DWC2 in chip and runs Linux well.
During TinyUSB integration, I did followings.

1. Defined tusb_config.h

#define TUP_USBIP_DWC2
#define TUP_USBIP_DWC2_INGENIC

#define CFG_TUH_DWC2_DMA_ENABLE  1
#define CFG_TUD_DWC2_DMA_ENABLE  1


/* USB DMA on some MCUs can only access a specific SRAM region with restriction on alignment.
 * Tinyusb use follows macros to declare transferring memory so that they can be put
 * into those specific section.
 * e.g
 * - CFG_TUSB_MEM SECTION : __attribute__ (( section(".usb_ram") ))
 * - CFG_TUSB_MEM_ALIGN   : __attribute__ ((aligned(4)))
 */
#ifndef CFG_TUH_MEM_SECTION
#define CFG_TUH_MEM_SECTION
#endif

#define CFG_TUD_DWC2_DMA_ENABLE   1

#ifndef CFG_TUH_MEM_ALIGN
#define CFG_TUH_MEM_ALIGN     __attribute__ ((aligned(32)))
#endif

//--------------------------------------------------------------------
// Host Configuration
//--------------------------------------------------------------------

// Enable Host stack
#define CFG_TUH_ENABLED       1
// RHPort max operational speed can defined by board.mk
#ifndef BOARD_TUH_MAX_SPEED
#define BOARD_TUH_MAX_SPEED   OPT_MODE_HIGH_SPEED
#endif

// Default is max speed that hardware controller could support with on-chip PHY
#define CFG_TUH_MAX_SPEED     BOARD_TUH_MAX_SPEED

//------------------------- Board Specific --------------------------

// RHPort number used for host can be defined by board.mk, default to port 0
#ifndef BOARD_TUH_RHPORT
#define BOARD_TUH_RHPORT      0
#endif

//--------------------------------------------------------------------
// Driver Configuration
//--------------------------------------------------------------------

// Size of buffer to hold descriptors and other data used for enumeration
#define CFG_TUH_ENUMERATION_BUFSIZE 256

// only hub class is enabled
#define CFG_TUH_HUB                 1

// max device support (excluding hub device): 1 hub typically has 4 ports
#define CFG_TUH_DEVICE_MAX          (3*CFG_TUH_HUB + 1)

2. Defined dwc2_mips.h

#define DWC2_HS_REG_BASE   0xb3500000UL
#define DWC2_EP_MAX        16

static const dwc2_controller_t _dwc2_controller[] = {
  { .reg_base = DWC2_HS_REG_BASE, .irqnum = 0, .ep_count = DWC2_EP_MAX, .ep_in_count = 5, .ep_fifo_size = 0xdf8 }
};

static void dwc2_int_handler_wrap(void* arg) {
  const uint8_t rhport = tu_u16_low((uint16_t)(uint32_t)arg);
  const tusb_role_t role = (tusb_role_t) tu_u16_high((uint16_t)(uint32_t)arg);
#if CFG_TUD_ENABLED
  if (role == TUSB_ROLE_DEVICE) {
    dcd_int_handler(rhport);
  }
#endif
#if CFG_TUH_ENABLED && !CFG_TUH_MAX3421
  if (role == TUSB_ROLE_HOST) {
    hcd_int_handler(rhport, true);
  }
#endif
}

3. Defined osal/osal_myos.h
4. call tusb_init() as examples/host/device_info does.

int main_task(int argc, char *argv[])
{
    int count = 0;
    printf("nano entry here!\r\n");

  // init host stack on configured roothub port
  tusb_rhport_init_t host_init = {
    .role = TUSB_ROLE_HOST,
    .speed = TUSB_SPEED_HIGH,
  };
  tusb_init(BOARD_TUH_RHPORT, &host_init);

  while (1) {
    // tinyusb host task
    tuh_task();
  }
}

5. defined a board_init() to config OTG Phy as host mode.

Here is the log when I plugged in a mouse.

USBH init on controller 0, speed = High
sizeof(usbh_data_t) = 28
sizeof(usbh_device_t) = 94
sizeof(hcd_event_t) = 12
sizeof(tuh_xfer_t) = 28
sizeof(tu_fifo_t) = 20
sizeof(tu_edpt_stream_t) = 36
HUB init
guid, gsnpsid, ghwcfg1, ghwcfg2, ghwcfg3, ghwcfg4
0x00000000, 0x4F54300A, 0x00000000, 0x228BE050, 0x0DF80CE8, 0xE3F08020
Highspeed UTMI+ PHY init
DMA = 1
[0:] USBH Device Attach
Low Speed
[0:0] Open EP0 with Size = 8
Get 8 byte of Device Descriptor
[0:0] Get Descriptor: 80 06 00 01 00 00 08 00
[:0] on EP 00 with 8 bytes: OK
[:0] on EP 80 with 0 bytes: STALLED
[0:0] Control STALLED, xferred_bytes = 0
80 06 00 01 00 00 08 00

Set Address = 1
[0:0] Set Address: 00 05 01 00 00 00 00 00
[:0] on EP 00 with 8 bytes: OK
[:0] on EP 80 with 0 bytes: STALLED
[0:0] Control STALLED, xferred_bytes = 0
00 05 01 00 00 00 00 00

[0:1] Open EP0 with Size = 0
Get Device Descriptor
[0:1] Get Descriptor: 80 06 00 01 00 00 12 00

What caused this error and how to fix it?
Thanks,

[HiFiPhile]

Hi, I think maybe you need a USB protocol analyzer in this case. I remember I met a PID sequence issue with the same symptoms, is it happening on all kinds of devices?

[wangtao13]

Thanks for comment...
I did tests with mouse and a USB disk, I got the same result.
Then I tried CherryUSB stack (I did the integration), with the mouse and USB disk, I got following logs.

 [I/usbh_hub] New low-speed device on Bus 0, Hub 1, Port 1 connected
[I/USB] SETUP: 80 06 0100 0000 0008
[E/USB] XXX hport->speed: 1, get_port_speed: 1, chidx: 0
[E/USB] XXX data_pid: 2, split: 0, ep0_state: 0, maxpktsz: 8
[E/USB] SETUP: 80 06 0100 0000 0008
[E/USB] EP=00 PID=3, buf=0x80331000, len=8, HCCHAR: 80120008, HCTSIZ: 60080008, GINTMSK: 23000000
[E/USB] outchan: ISR ch0: HCCHAR=00120008 HCINT=00000023, ch_num:0
[I/USB] XXX HCINT:00000000, HCCHAR: 00120008
[E/USB] XXX data_pid: 2, split: 0, ep0_state: 1, maxpktsz: 8
[E/USB] EP=80 PID=2, buf=0x80330e00, len=8, HCCHAR: a0128008, HCTSIZ: 40080008, GINTMSK: 23000000
[E/USB] Inchan: ISR ch0: HCCHAR=20128008 HCINT=0000000a, ch_num:0
[E/USB] XXXXXX usbh_submit_urb, 1109, ret: 0, err: -8
[W/usbh_core] Control transfer failed, errorcode -8, retrying...

The inchan_irqhandler() said the HCINT is 0x0000000a, bit3 of STALL is set!
I think both USB stacks hit the same issue, but Linux does NOT.
I have NO USB analyser nearby, what should I forcus on?

[HiFiPhile]

Your controller has a version of 3.00a which hasn't been tested before, it's worth to check if there is any workaround targeted to this version in kernel driver.
See https://github.com/hathach/tinyusb/blob/master/src/portable/synopsys/dwc2/dwc2_info.md

What about device mode and/or DMA disabled ? It could also be a cache issue.

Anyway it's hard to say without seeing what's happening on the bus, you can get a cheap and nice analyzer at https://www.usbpacketviewer.com/

[wangtao13]

I have NOT tried device mode (this is OTG port, I want to make host mode work firstly). I tried with DMA disabled, and I got the same issue.

I am not quite sure what kind of cache issue it is, I did port the cache operation functions (from uboot).
I am not familiar with USB protocol, and from the logs, I think the 'SETUP' transaction is completed, but 'DATA IN' stalled, right?

Since both TinyUSB and CherryUSB hit the same issue of failing enumerating devices, I think it may come from my porting, but I could NOT figure out where to dig into.....