diff options
Diffstat (limited to 'drivers/usb/early')
| -rw-r--r-- | drivers/usb/early/ehci-dbgp.c | 41 |
1 files changed, 29 insertions, 12 deletions
diff --git a/drivers/usb/early/ehci-dbgp.c b/drivers/usb/early/ehci-dbgp.c index f0a41c647be..1206a26ef89 100644 --- a/drivers/usb/early/ehci-dbgp.c +++ b/drivers/usb/early/ehci-dbgp.c @@ -245,16 +245,9 @@ static inline void dbgp_get_data(void *buf, int size) bytes[i] = (hi >> (8*(i - 4))) & 0xff; } -static int dbgp_bulk_write(unsigned devnum, unsigned endpoint, - const char *bytes, int size) +static int dbgp_out(u32 addr, const char *bytes, int size) { - u32 pids, addr, ctrl; - int ret; - - if (size > DBGP_MAX_PACKET) - return -1; - - addr = DBGP_EPADDR(devnum, endpoint); + u32 pids, ctrl; pids = readl(&ehci_debug->pids); pids = dbgp_pid_update(pids, USB_PID_OUT); @@ -267,10 +260,34 @@ static int dbgp_bulk_write(unsigned devnum, unsigned endpoint, dbgp_set_data(bytes, size); writel(addr, &ehci_debug->address); writel(pids, &ehci_debug->pids); + return dbgp_wait_until_done(ctrl); +} - ret = dbgp_wait_until_done(ctrl); - if (ret < 0) - return ret; +static int dbgp_bulk_write(unsigned devnum, unsigned endpoint, + const char *bytes, int size) +{ + int ret; + int loops = 5; + u32 addr; + if (size > DBGP_MAX_PACKET) + return -1; + + addr = DBGP_EPADDR(devnum, endpoint); +try_again: + if (loops--) { + ret = dbgp_out(addr, bytes, size); + if (ret == -DBGP_ERR_BAD) { + int try_loops = 3; + do { + /* Emit a dummy packet to re-sync communication + * with the debug device */ + if (dbgp_out(addr, "12345678", 8) >= 0) { + udelay(2); + goto try_again; + } + } while (try_loops--); + } + } return ret; } |