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usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer 

This patch adds a code to surely disable TX IRQ of the pipe before
starting TX DMAC transfer. Otherwise, a lot of unnecessary TX IRQs
may happen in rare cases when DMAC is used.

Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Yoshihiro Shimoda 2016-03-10 11:30:15 +09:00 committed by Felipe Balbi
parent 894f2fc44f
commit 6490865c67
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/renesas_usbhs/fifo.c
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@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
pkt->trans = len; pkt->trans = len;
usbhsf_tx_irq_ctrl(pipe, 0);
INIT_WORK(&pkt->work, xfer_work); INIT_WORK(&pkt->work, xfer_work);
schedule_work(&pkt->work); schedule_work(&pkt->work);