This is a note to let you know that I've just added the patch titled
usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs
to the 4.9-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-dwc3-gadget-set-pcm1-field-of-isochronous-first-trbs.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6b9018d4c1e5c958625be94a160a5984351d4632 Mon Sep 17 00:00:00 2001
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Date: Thu, 22 Sep 2016 11:01:01 +0300
Subject: usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs
From: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
commit 6b9018d4c1e5c958625be94a160a5984351d4632 upstream.
In case of High-Speed, High-Bandwidth endpoints, we
need to tell DWC3 that we have more than one packet
per interval. We do that by setting PCM1 field of
Isochronous-First TRB.
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -771,6 +771,9 @@ static void dwc3_prepare_one_trb(struct
unsigned length, unsigned chain, unsigned node)
{
struct dwc3_trb *trb;
+ struct dwc3 *dwc = dep->dwc;
+ struct usb_gadget *gadget = &dwc->gadget;
+ enum usb_device_speed speed = gadget->speed;
dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s",
dep->name, req, (unsigned long long) dma,
@@ -798,10 +801,16 @@ static void dwc3_prepare_one_trb(struct
break;
case USB_ENDPOINT_XFER_ISOC:
- if (!node)
+ if (!node) {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
- else
+
+ if (speed == USB_SPEED_HIGH) {
+ struct usb_ep *ep = &dep->endpoint;
+ trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
+ }
+ } else {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
+ }
/* always enable Interrupt on Missed ISOC */
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
Patches currently in stable-queue which might be from felipe.balbi@xxxxxxxxxxxxxxx are
queue-4.9/usb-gadget-composite-always-set-ep-mult-to-a-sensible-value.patch
queue-4.9/usb-gadget-f_uac2-fix-error-handling-at-afunc_bind.patch
queue-4.9/usb-dwc3-gadget-set-pcm1-field-of-isochronous-first-trbs.patch
queue-4.9/usb-gadget-composite-correctly-initialize-ep-maxpacket.patch
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