usb: renesas_usbhs: Use dmac only if the pipe type is bulk

[ Upstream commit 700aa7ff8d2c2b9cc669c99375e2ccd06d3cd38d ]

This patch fixes an issue that isochronous transfer's data is possible to
be lost as a workaround. Since this driver uses a workqueue to start
the dmac, the transfer is possible to be delayed when system load is high.

Fixes: 6e4b74e4690d ("usb: renesas: fix scheduling in atomic context bug")
Cc: <stable@vger.kernel.org> # v3.4+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index db565f620f82daf410e14961a8189d96638492f9..36e5b5c530bdcd39ce17f0990a5827e471d98f91 100644 (file)
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -869,7 +869,7 @@ static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 
        /* use PIO if packet is less than pio_dma_border or pipe is DCP */
        if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
-           usbhs_pipe_is_dcp(pipe))
+           usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
                goto usbhsf_pio_prepare_push;
 
        /* check data length if this driver don't use USB-DMAC */
@@ -974,7 +974,7 @@ static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
 
        /* use PIO if packet is less than pio_dma_border or pipe is DCP */
        if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
-           usbhs_pipe_is_dcp(pipe))
+           usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
                goto usbhsf_pio_prepare_pop;
 
        fifo = usbhsf_get_dma_fifo(priv, pkt);