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| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2020-05-05 19:47:09 -0700 |
|---|---|---|
| committer | Felipe Balbi <balbi@kernel.org> | 2020-05-25 11:09:42 +0300 |
| commit | 140ca4cfea8a7aeff89c8969a4cc7ce125a04159 (patch) | |
| tree | 8cde2d3b05b87d0522911470a41dc57a9dafac01 /drivers/usb/dwc3/debug.h | |
| parent | aefe3d232b6629cb0ac92cc3d4238a5133dd9fec (diff) | |
usb: dwc3: gadget: Handle stream transfers
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.
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb/dwc3/debug.h')
| -rw-r--r-- | drivers/usb/dwc3/debug.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/debug.h b/drivers/usb/dwc3/debug.h index 0f95656c9622..d8f600e0e88f 100644 --- a/drivers/usb/dwc3/debug.h +++ b/drivers/usb/dwc3/debug.h @@ -68,6 +68,8 @@ dwc3_gadget_generic_cmd_string(u8 cmd) return "All FIFO Flush"; case DWC3_DGCMD_SET_ENDPOINT_NRDY: return "Set Endpoint NRDY"; + case DWC3_DGCMD_SET_ENDPOINT_PRIME: + return "Set Endpoint Prime"; case DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK: return "Run SoC Bus Loopback Test"; default: |