diff mbox series

[v2,01/11] usb: gadget: Introduce usb_request->is_last

Message ID d5c089459fc34be53e9a9395d7f24618db37f3db.1588732815.git.thinhn@synopsys.com (mailing list archive)
State Mainlined
Commit 5469fd64efcfbc2b9b2edb92c4f906912736d5b0
Headers show
Series usb: dwc3: gadget: Handle streams | expand

Commit Message

Thinh Nguyen May 6, 2020, 2:46 a.m. UTC 
To take advantage of DWC3 internal TRB prefetch and cache for
performance, inform the controller the last request with stream_id
before switching to a different stream transfer. This allows the
controller to maintain its transfer burst within the stream ID.

Introduce the usb-request is_last field to help inform the DWC3
controller of this.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
---
 include/linux/usb/gadget.h | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index e959c09a97c9..281eabae7f33 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -42,6 +42,8 @@  struct usb_ep;
  * @num_mapped_sgs: number of SG entries mapped to DMA (internal)
  * @length: Length of that data
  * @stream_id: The stream id, when USB3.0 bulk streams are being used
+ * @is_last: Indicates if this is the last request of a stream_id before
+ *	switching to a different stream (required for DWC3 controllers).
  * @no_interrupt: If true, hints that no completion irq is needed.
  *	Helpful sometimes with deep request queues that are handled
  *	directly by DMA controllers.
@@ -104,6 +106,7 @@  struct usb_request {
 	unsigned		num_mapped_sgs;
 
 	unsigned		stream_id:16;
+	unsigned		is_last:1;
 	unsigned		no_interrupt:1;
 	unsigned		zero:1;
 	unsigned		short_not_ok:1;