usb: musb: cppi41: fix condition to call cppi41_trans_done().
connect AR9271(USB wifi) to AM335x, and send a flood ping from Mac OSX,
AR9271 is stopped.
on USB bus, the following occurs.
- OUT transaction is ACKed (NYET).
- IN transaction is ACKed (512bytes).
- PING-NAK transaction is continued for about 2 seconds (AR9271 timeout?).
In current imprementation, IN-transaction is not completed because it
checks the empty of TX-FIFO in cppi41_dma_callback().
As a result, communication to AR9271 stops.
This patch modified to check the empty of TX-FIFO only when OUT-transaction.
Signed-off-by: Takeyoshi Kikuchi <kikuchi@centurysys.co.jp>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index 9dc45a4..8bd8c5e 100644
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -250,8 +250,10 @@
transferred < cppi41_channel->packet_sz)
cppi41_channel->prog_len = 0;
- empty = musb_is_tx_fifo_empty(hw_ep);
- if (empty) {
+ if (cppi41_channel->is_tx)
+ empty = musb_is_tx_fifo_empty(hw_ep);
+
+ if (!cppi41_channel->is_tx || empty) {
cppi41_trans_done(cppi41_channel);
goto out;
}