patch "usb: renesas_usbhs: clear the BRDYSTS in usbhsg_ep_enable()" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: renesas_usbhs: clear the BRDYSTS in usbhsg_ep_enable()

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Yoshihiro Shimoda <[email protected]>
Date: Mon, 8 Aug 2016 21:50:52 +0900
Subject: usb: renesas_usbhs: clear the BRDYSTS in usbhsg_ep_enable()

This patch fixes an issue that unexpected BRDY interruption happens when the usb_ep_{enable,disable}() are called with different direction. In this case, the driver will cause the following message:

renesas_usbhs e6590000.usb: irq_ready run_error 1 : -16

This issue causes the followings:
1) A pipe is enabled as transmission
2) The pipe sent a data
3) The pipe is disabled and re-enabled as reception.
4) The pipe got a queue

Since the driver doesn't clear the BRDYSTS flags after 2) above, the issue happens. If we add such clearing the flags into the driver, the code will become complicate. So, this patch clears the BRDYSTS flag of reception in usbhsg_ep_enable() to avoid complicate.

---
 drivers/usb/renesas_usbhs/mod_gadget.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

index 50f3363cc382..92bc83b92d10 100644
@@ -617,10 +617,13 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 		 * use dmaengine if possible.
 		 * It will use pio handler if impossible.
 		 */
-		if (usb_endpoint_dir_in(desc))
+		if (usb_endpoint_dir_in(desc)) {
 			pipe->handler = &usbhs_fifo_dma_push_handler;
-		else
+		} else {
 			pipe->handler = &usbhs_fifo_dma_pop_handler;
+			usbhs_xxxsts_clear(priv, BRDYSTS,
+					   usbhs_pipe_number(pipe));
+		}
 
 		ret = 0;
 	}

2.9.2