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linux-sg2042
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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>
This commit is contained in:
Takeyoshi Kikuchi 2015-03-02 11:03:51 +09:00 committed by Felipe Balbi
parent 168bdb88c3
commit 72a472d2f9
1 changed files with 4 additions and 2 deletions
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4
drivers/usb/musb/musb_cppi41.c
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@ -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;
}