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Diffstat (limited to 'payloads/libpayload/include/usb')
| -rw-r--r-- | payloads/libpayload/include/usb/usb.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/payloads/libpayload/include/usb/usb.h b/payloads/libpayload/include/usb/usb.h index 79c4586c4a..db7ec57d57 100644 --- a/payloads/libpayload/include/usb/usb.h +++ b/payloads/libpayload/include/usb/usb.h @@ -71,6 +71,24 @@ typedef enum { /* SetAddress() recovery interval (USB 2.0 specification 9.2.6.3 */ #define SET_ADDRESS_MDELAY 2 +/* + * USB sets an upper limit of 5 seconds for any transfer to be completed. + * + * Data originally from EHCI driver: + * Tested with some USB2.0 flash sticks: + * TUR turn around took about 2.2s for the slowest (13fe:3800), maximum + * of 250ms for the others. + * + * SET ADDRESS on xHCI controllers. + * The USB specification indicates that devices must complete processing + * of a SET ADDRESS request within 50 ms. However, some hubs were found + * to take more than 100 ms to complete a SET ADDRESS request on a + * downstream port. + */ +#define USB_MAX_PROCESSING_TIME_US (5 * 1000 * 1000) + +#define USB_FULL_LOW_SPEED_FRAME_US 1000 + typedef struct { unsigned char bDescLength; unsigned char bDescriptorType; |