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usb: musb: cppi41: don't check early-TX-interrupt for Isoch transfer

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commit 0090114d336a9604aa2d90bc83f20f7cd121b76c upstream.

The CPPI 4.1 driver polls register to workaround the premature TX
interrupt issue, but it causes audio playback underrun when triggered in
Isoch transfers.

Isoch doesn't do back-to-back transfers, the TX should be done by the
time the next transfer is scheduled. So skip this polling workaround for
Isoch transfer.

Fixes: a655f481d83d6 ("usb: musb: musb_cppi41: handle pre-mature TX complete interrupt")
Reported-by: Alexandre Bailon <abailon@baylibre.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bin Liu 2017-03-10 14:43:35 -06:00 committed by Greg Kroah-Hartman
parent a7cb1fafe4
commit 47285be050
1 changed files with 21 additions and 2 deletions
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23
drivers/usb/musb/musb_cppi41.c
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@ -250,8 +250,27 @@ 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 (cppi41_channel->is_tx) {
u8 type;
if (is_host_active(musb))
type = hw_ep->out_qh->type;
else
type = hw_ep->ep_in.type;
if (type == USB_ENDPOINT_XFER_ISOC)
/*
* Don't use the early-TX-interrupt workaround below
* for Isoch transfter. Since Isoch are periodic
* transfer, by the time the next transfer is
* scheduled, the current one should be done already.
*
* This avoids audio playback underrun issue.
*/
empty = true;
else
empty = musb_is_tx_fifo_empty(hw_ep);
}
if (!cppi41_channel->is_tx || empty) {
cppi41_trans_done(cppi41_channel);