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path: root/drivers/usb/early
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Diffstat (limited to 'drivers/usb/early')
-rw-r--r--drivers/usb/early/ehci-dbgp.c41
1 files changed, 29 insertions, 12 deletions
diff --git a/drivers/usb/early/ehci-dbgp.c b/drivers/usb/early/ehci-dbgp.c
index f0a41c647bef..1206a26ef893 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;
}