Hi, Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> writes: > Overview of stream transfer requirement: > * A transfer will have a set of TRBs of the same stream ID. > * A transfer is started with a stream ID in START_TRANSFER command. > * A new stream will only start when the previous completes. > > Overview of stream events: > * A "prime" from host indicates that its endpoints are active > (buffers prepared and ready to receive/transmit data). The controller > automatically initiates stream if it sees this. > * A "NoStream" rejection event indicates that the host isn't ready. > Host will put the endpoint back to idle state. Device may need to > reinitiate the stream to start transfer again. > * A Stream Found event means host accepted device initiated stream. > Nothing needs to be done from driver. > > To initiate a stream, the driver will issue START_TRANSFER command with a > stream ID. To reinitiate the stream, the driver must issue END_TRANSFER and > restart the transfer with START_TRANSFER command with the same stream ID. > > This implementation handles device-initated streams (e.g. UASP driver). It > also handles some hosts' quirky behavior where they only prime each endpoint > once. > > Prerequisite: > This series requires DWC_usb32 patch series > https://patchwork.kernel.org/project/linux-usb/list/?series=269641 > > [PATCH 1/2] usb: dwc3: Add support for DWC_usb32 IP > [PATCH 2/2] usb: dwc3: Get MDWIDTH for DWC_usb32 > > > Changes in v2: > - Update cover letter > - Split handling of stream and of transfer completion into smaller patches > - Reword usb_request->is_last to strictly use for streams > - Enforce transfer completion handling to only for stream capable endpoints > > > Thinh Nguyen (11): > usb: gadget: Introduce usb_request->is_last > usb: gadget: f_tcm: Inform last stream request > usb: dwc3: gadget: Continue to process pending requests > usb: dwc3: gadget: Check for in-progress END_TRANSFER > usb: dwc3: gadget: Refactor TRB completion handler > usb: dwc3: gadget: Enable XferComplete event > usb: dwc3: gadget: Handle XferComplete for streams > usb: dwc3: gadget: Wait for transfer completion > usb: dwc3: gadget: Don't prepare beyond a transfer > usb: dwc3: gadget: Handle stream transfers > usb: dwc3: gadget: Use SET_EP_PRIME for NoStream This seris is now in testing/next. Can you check that everything looks fine for you? I had to manually apply one patch. -- balbi
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