Patch "usb: gadget: udc: renesas_usb3: fix Pn_RAMMAP.Pn_MPKT value" has been added to the 4.13-stable tree

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

usb: gadget: udc: renesas_usb3: fix Pn_RAMMAP.Pn_MPKT value

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
usb-gadget-udc-renesas_usb3-fix-pn_rammap.pn_mpkt-value.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Yoshihiro Shimoda <[email protected]>
Date: Mon, 25 Sep 2017 17:01:24 +0900
Subject: usb: gadget: udc: renesas_usb3: fix Pn_RAMMAP.Pn_MPKT value

From: Yoshihiro Shimoda <[email protected]>

commit 73f2f5745f18b4ccfe9484deac4e84a1378d19fd upstream.

According to the datasheet of R-Car Gen3, the Pn_RAMMAP.Pn_MPKT should be set to one of 8, 16, 32, 64, 512 and 1024. Otherwise, when a gadget driver uses an interrupt endpoint, unexpected behavior happens. So, this patch fixes it.

---
 drivers/usb/gadget/udc/renesas_usb3.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

@@ -2048,7 +2048,16 @@ static u32 usb3_calc_ramarea(int ram_siz
 static u32 usb3_calc_rammap_val(struct renesas_usb3_ep *usb3_ep,
 				const struct usb_endpoint_descriptor *desc)
 {
-	return usb3_ep->rammap_val | PN_RAMMAP_MPKT(usb_endpoint_maxp(desc));
+	int i;
+	const u32 max_packet_array[] = {8, 16, 32, 64, 512};
+	u32 mpkt = PN_RAMMAP_MPKT(1024);
+
+	for (i = 0; i < ARRAY_SIZE(max_packet_array); i++) {
+		if (usb_endpoint_maxp(desc) <= max_packet_array[i])
+			mpkt = PN_RAMMAP_MPKT(max_packet_array[i]);
+	}
+
+	return usb3_ep->rammap_val | mpkt;
 }
 
 static int usb3_enable_pipe_n(struct renesas_usb3_ep *usb3_ep,

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/usb-gadget-udc-renesas_usb3-fix-return-value-of-usb3_write_pipe.patch queue-4.13/usb-gadget-udc-renesas_usb3-fix-pn_rammap.pn_mpkt-value.patch queue-4.13/usb-renesas_usbhs-fix-usbhsf_fifo_clear-for-rx-direction.patch queue-4.13/usb-gadget-udc-renesas_usb3-fix-for-no-data-control-transfer.patch queue-4.13/usb-renesas_usbhs-fix-the-bclr-setting-condition-for-non-dcp-pipe.patch