| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.5 094/124] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer | Date | Mon, 18 Apr 2016 11:29:26 +0900 |
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4.5-stable review patch. If anyone has any objections, please let me know.
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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
commit 6490865c67825277b29638e839850882600b48ec upstream.
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") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/renesas_usbhs/fifo.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(struc pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); INIT_WORK(&pkt->work, xfer_work); schedule_work(&pkt->work);
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