From: Yoshihiro Shimoda Date: Thu, 10 Mar 2016 02:30:15 +0000 (+0900) Subject: usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer X-Git-Tag: firefly_0821_release~176^2~4^2~49^2~33 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=46e081b3015dd0d97e443babf0a7ec2058637d83;p=firefly-linux-kernel-4.4.55.git usb: renesas_usbhs: disable TX IRQ before starting TX DMAC transfer 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 Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c index 32df73820726..f1893e08e51a 100644 --- a/drivers/usb/renesas_usbhs/fifo.c +++ b/drivers/usb/renesas_usbhs/fifo.c @@ -890,6 +890,7 @@ static int usbhsf_dma_prepare_push(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);