usb: gadget: renesas_usbhs: disable pipe on top of interrupt

When data read interrupt happened, the pipe is BUF which means "enable".
then, next un-necessary interrupt/token might be
issued again when all data were popped from fifo.
It will cause un-understandable bug.
This patch decides pipe disable on top of read interrupt.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 14 insertions, 9 deletions

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 87f56b604809..1a345c20105f 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -476,6 +476,20 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
         total_len       = len;
 
         /*
+         * update actual length first here to decide disable pipe.
+         * if this pipe keeps BUF status and all data were popped,
+         * then, next interrupt/token will be issued again
+         */
+        pkt->actual += total_len;
+
+        if ((pkt->actual == pkt->length) ||     /* receive all data */
+            (total_len < maxp)) {               /* short packet */
+                *is_done = 1;
+                usbhsf_rx_irq_ctrl(pipe, 0);
+                usbhs_pipe_disable(pipe);       /* disable pipe first */
+        }
+
+        /*
          * Buffer clear if Zero-Length packet
          *
          * see
@@ -505,16 +519,7 @@ static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
         }
 
-        pkt->actual += total_len;
-
 usbhs_fifo_read_end:
-        if ((pkt->actual == pkt->length) ||     /* receive all data */
-            (total_len < maxp)) {               /* short packet */
-                *is_done = 1;
-                usbhsf_rx_irq_ctrl(pipe, 0);
-                usbhs_pipe_disable(pipe);
-        }
-
         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
                 usbhs_pipe_number(pipe),
                 pkt->length, pkt->actual, *is_done, pkt->zero);