linux-kernel - [PATCH 4.4 040/113] usb: renesas_usbhs: clear the BRDYSTS in usbhsg_ep

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Date:   Mon,  5 Sep 2016 18:44:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.4 040/113] usb: renesas_usbhs: clear the BRDYSTS in usbhsg_ep_enable()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 9ab967e6db7412b675ecbff80d5371d53c82cb2e upstream.

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.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -618,10 +618,13 @@ static int usbhsg_ep_enable(struct usb_e
 		 * 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;
 	}