On Sat, 27 Jun 2015, Jayan John wrote: > Thanks. > > Yes, the wLength value in the Setup packet is equal to 64. "Aligned" > was the wrong term, multiple of 64 would be more appropriate :). > > The hid gadget driver queues a request for the transfer. Please see below logs.. > ... > HID: drivers/usb/gadget/f_hid_meu.c:366 - hidg_setup() > HID: hid_setup crtl_request : bRequestType:0x21 bRequest:0x9 Value:0x200 What driver is this? I don't see drivers/usb/gadget/f_hid_meu.c in 4.1. I do see drivers/usb/gadget/function/f_hid.c, but in that driver the hidg_setup() routine does this: case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | HID_REQ_SET_REPORT): VDBG(cdev, "set_report | wLength=%d\n", ctrl->wLength); goto stall; break; Thus, it doesn't handle Set Report at all. > HID: drivers/usb/chipidea/udc.c:1337 - ep_queue() > HID: drivers/usb/chipidea/udc.c:794 - _ep_queue() > HID: drivers/usb/chipidea/udc.c:467 - _hardware_enqueue() > HID: drivers/usb/chipidea/udc.c:395 - add_td_to_list() > HID: drivers/usb/chipidea/udc.c:61 - hw_ep_bit() > HID: drivers/usb/chipidea/udc.c:209 - hw_ep_prime() > .. > > > In the 64 bytes case, the following logs are missing (indicating > transfer complete interrupt): > ... > HID: drivers/usb/chipidea/core.c:368 - ci_irq() > HID: drivers/usb/chipidea/udc.c:1786 - udc_irq() > HID: drivers/usb/chipidea/udc.c:282 - hw_read_intr_status() > HID: drivers/usb/chipidea/udc.c:271 - hw_read_intr_enable() > HID: drivers/usb/chipidea/udc.c:309 - hw_test_and_clear_intr_active() > HID: drivers/usb/chipidea/udc.c:992 - isr_tr_complete_handler() > HID: drivers/usb/chipidea/udc.c:295 - hw_test_and_clear_complete() > HID: drivers/usb/chipidea/udc.c:68 - ep_to_bit() > HID: drivers/usb/chipidea/udc.c:957 - isr_tr_complete_low() > HID: drivers/usb/chipidea/udc.c:583 - _hardware_dequeue() > HID: drivers/usb/gadget/f_hid_meu.c:322 - hidg_set_report_complete() > ... Assuming the ep_queue() was for a 64-byte transfer, this indicates there is a bug in the chipidea UDC driver or hardware. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
