From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
linux-usb@vger.kernel.org
Cc: John Youn <John.Youn@synopsys.com>
Subject: [PATCH v2 00/11] usb: dwc3: gadget: Handle streams
Date: Tue, 05 May 2020 19:46:06 -0700 [thread overview]
Message-ID: <cover.1588732815.git.thinhn@synopsys.com> (raw)
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
drivers/usb/dwc3/core.h | 12 ++
drivers/usb/dwc3/debug.h | 2 +
drivers/usb/dwc3/gadget.c | 225 +++++++++++++++++++++++++++++++-----
drivers/usb/gadget/function/f_tcm.c | 3 +
include/linux/usb/gadget.h | 3 +
5 files changed, 215 insertions(+), 30 deletions(-)
--
2.11.0
next reply other threads:[~2020-05-06 2:46 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-06 2:46 Thinh Nguyen [this message]
2020-05-06 2:46 ` [PATCH v2 01/11] usb: gadget: Introduce usb_request->is_last Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 02/11] usb: gadget: f_tcm: Inform last stream request Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 03/11] usb: dwc3: gadget: Continue to process pending requests Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 04/11] usb: dwc3: gadget: Check for in-progress END_TRANSFER Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 05/11] usb: dwc3: gadget: Refactor TRB completion handler Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 06/11] usb: dwc3: gadget: Enable XferComplete event Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 07/11] usb: dwc3: gadget: Handle XferComplete for streams Thinh Nguyen
2020-05-06 2:46 ` [PATCH v2 08/11] usb: dwc3: gadget: Wait for transfer completion Thinh Nguyen
2020-05-06 2:47 ` [PATCH v2 09/11] usb: dwc3: gadget: Don't prepare beyond a transfer Thinh Nguyen
2020-05-06 2:47 ` [PATCH v2 10/11] usb: dwc3: gadget: Handle stream transfers Thinh Nguyen
2020-05-06 2:47 ` [PATCH v2 11/11] usb: dwc3: gadget: Use SET_EP_PRIME for NoStream Thinh Nguyen
2020-05-14 10:43 ` [PATCH v2 00/11] usb: dwc3: gadget: Handle streams Felipe Balbi
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