diff options
Diffstat (limited to 'payloads/libpayload/drivers/usb/ehci.c')
| -rw-r--r-- | payloads/libpayload/drivers/usb/ehci.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/payloads/libpayload/drivers/usb/ehci.c b/payloads/libpayload/drivers/usb/ehci.c index 3d6c077b31..68763402af 100644 --- a/payloads/libpayload/drivers/usb/ehci.c +++ b/payloads/libpayload/drivers/usb/ehci.c @@ -247,6 +247,8 @@ static void free_qh_and_tds(ehci_qh_t *qh, qtd_t *cur) free((void *)qh); } +#define EHCI_SLEEP_TIME_US 50 + static int wait_for_tds(qtd_t *head) { /* returns the amount of bytes *not* transmitted, or -1 for error */ @@ -256,18 +258,10 @@ static int wait_for_tds(qtd_t *head) if (0) dump_td(virt_to_phys(cur)); /* wait for results */ - /* how long to wait? - * tested with some USB2.0 flash sticks: - * TUR turn around took - * about 2.2s for the slowest (13fe:3800) - * max. 250ms for the others - * slowest non-TUR turn around took about 1.3s - * set to 3s to be safe as a failed TUR can be fatal - */ - int timeout = 60000; /* time out after 60000 * 50us == 3s */ + int timeout = USB_MAX_PROCESSING_TIME_US / EHCI_SLEEP_TIME_US; while ((cur->token & QTD_ACTIVE) && !(cur->token & QTD_HALTED) && timeout--) - udelay(50); + udelay(EHCI_SLEEP_TIME_US); if (timeout < 0) { usb_debug("Error: ehci: queue transfer " "processing timed out.\n"); |