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| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2020-05-06 05:46:13 +0300 |
|---|---|---|
| committer | Felipe Balbi <balbi@kernel.org> | 2020-05-25 11:09:41 +0300 |
| commit | 5469fd64efcfbc2b9b2edb92c4f906912736d5b0 (patch) | |
| tree | 61ba3ccfec8520c911a57705184255311fc9fff5 /include/linux/usb | |
| parent | 4244ba02edb850f880fafe178abccd9231cb0e4a (diff) | |
| download | linux-5469fd64efcfbc2b9b2edb92c4f906912736d5b0.tar.xz | |
usb: gadget: Introduce usb_request->is_last
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>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/gadget.h | 3 |
1 files changed, 3 insertions, 0 deletions
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; |