linux-toradex.git/drivers/usb/dwc3/core.h, branch v5.0

usb: dwc3: gadget: Report isoc transfer frame number

2018-12-05T09:14:15+00:00

Implement the new frame_number API to report the isochronous interval
frame number. This patch checks and reports the interval in which the
isoc transfer was transmitted or received via the Isoc-First TRB SOF
number field.

Signed-off-by: Thinh Nguyen 
Signed-off-by: Felipe Balbi

usb: dwc3: gadget: check if dep->frame_number is still valid

2018-11-27T13:01:41+00:00

Gadget driver may take an unbounded amount of time to queue requests
after XferNotReady. This is important for isochronous endpoints which
need to be started for a specific (micro-)frame.

If we fail to start a transfer for isochronous endpoint, let's try
queueing to a future interval and see if that helps. We will stop trying
if we fail a start transfer for 5 intervals in the future.

Signed-off-by: Felipe Balbi

usb: dwc3: gadget: remove wait_end_transfer

2018-11-26T07:08:30+00:00

Now that we have a list of cancelled requests, we can skip over TRBs
when END_TRANSFER command completes.

Signed-off-by: Felipe Balbi

usb: dwc3: gadget: introduce cancelled_list

2018-11-26T07:08:29+00:00

This list will host cancelled requests who still have TRBs being
processed.

Signed-off-by: Felipe Balbi

usb: dwc3: gadget: track number of TRBs per request

2018-11-26T07:08:29+00:00

This will help us remove the wait_event() from our ->dequeue().

Signed-off-by: Felipe Balbi

usb: dwc3: gadget: combine unaligned and zero flags

2018-11-26T07:08:29+00:00

Both flags are used for the same purpose in dwc3: appending an extra
TRB at the end to deal with controller requirements. By combining both
flags into one, we make it clear that the situation is the same and
that they should be treated equally.

Signed-off-by: Felipe Balbi

usb: dwc3: Add workaround for isoc start transfer failure

2018-11-26T07:06:32+00:00

In DWC_usb31 version 1.70a-ea06 and prior, for highspeed and fullspeed
isochronous IN, BIT[15:14] of the 16-bit microframe number reported by
the XferNotReady event are invalid. The driver uses this number to
schedule the isochronous transfer and passes it to the START TRANSFER
command. Because this number is invalid, the command may fail. If
BIT[15:14] matches the internal 16-bit microframe, the START TRANSFER
command will pass and the transfer will start at the scheduled time, if
it is off by 1, the command will still pass, but the transfer will start
2 seconds in the future. For all other conditions, the START TRANSFER
command will fail with bus-expiry.

In order to workaround this issue, we can test for the correct
combination of BIT[15:14] by sending START TRANSFER commands with
different values of BIT[15:14]: 'b00, 'b01, 'b10, and 'b11. Each
combination is 2^14 uframe apart (or 2 seconds). 4 seconds into the
future will result in a bus-expiry status. As the result, within the 4
possible combinations for BIT[15:14], there will be 2 successful and 2
failure START COMMAND status. One of the 2 successful command status
will result in a 2-second delay start. The smaller BIT[15:14] value is
the correct combination.

Since there are only 4 outcomes and the results are ordered, we can
simply test 2 START TRANSFER commands with BIT[15:14] combinations 'b00
and 'b01 to deduce the smaller successful combination.

Let test0 = test status for combination 'b00 and test1 = test status for
'b01 of BIT[15:14]. The correct combination is as follow:

if test0 fails and test1 passes, BIT[15:14] is 'b01
if test0 fails and test1 fails, BIT[15:14] is 'b10
if test0 passes and test1 fails, BIT[15:14] is 'b11
if test0 passes and test1 passes, BIT[15:14] is 'b00

Synopsys STAR 9001202023: Wrong microframe number for isochronous IN
endpoints.

Signed-off-by: Thinh Nguyen 
Signed-off-by: Felipe Balbi

usb: dwc3: Track DWC_usb31 VERSIONTYPE

2018-11-26T07:06:32+00:00

Add a new field to dwc3 structure to track VERSIONTYPE. The VERSIONTYPE
is represented in ASCII in the 32-bit VERSIONTYPE register. In
DWC_usb31, sub releases for each version are tracked with VERSIONTYPE
such as "ea01" and "ea02".

Signed-off-by: Thinh Nguyen 
Signed-off-by: Felipe Balbi

usb: dwc3: Set default mode for DWC_usb3 v3.30a and higher

2018-11-26T07:06:32+00:00

DWC_usb31 and DWC_usb3 v3.30a and higher do not support OTG mode. If
the controller supports DRD but the dr_mode is not specified or set to
OTG, then set the mode to peripheral.

Signed-off-by: Thinh Nguyen 
Signed-off-by: Felipe Balbi

usb: dwc3: Support option to disable USB2 LPM

2018-11-26T07:06:31+00:00

Support the option to disable USB2 LPM. Set xhci "usb2-lpm-disable"
property via "snps,usb2-lpm-disable" property.

Signed-off-by: Thinh Nguyen 
Signed-off-by: Felipe Balbi