| From | Jiri Slaby <> | Subject | [PATCH 3.12 50/78] usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer | Date | Fri, 22 Apr 2016 13:05:33 +0200 |
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From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
3.12-stable review patch. If anyone has any objections, please let me know.
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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: Jiri Slaby <jslaby@suse.cz> --- drivers/usb/renesas_usbhs/fifo.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c index 1550c103f8a3..13170ed3c392 100644 --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -946,6 +946,7 @@ static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done) pkt->trans = len; + usbhsf_tx_irq_ctrl(pipe, 0); INIT_WORK(&pkt->work, xfer_work); schedule_work(&pkt->work); -- 2.8.1
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