Commit 72a472d2 authored Mar 02, 2015 by Takeyoshi Kikuchi Committed by Felipe Balbi Mar 11, 2015

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>

parent 168bdb88

drivers/usb/musb/musb_cppi41.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -250,8 +250,10 @@ static void cppi41_dma_callback(void *private_data)
		transferred < cppi41_channel->packet_sz)
		cppi41_channel->prog_len = 0;

		if (cppi41_channel->is_tx)
		empty = musb_is_tx_fifo_empty(hw_ep);
		if (empty) {

		if (!cppi41_channel->is_tx \|\| empty) {
		cppi41_trans_done(cppi41_channel);
		goto out;
		}

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