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usb: dwc3: gadget: Disable CSP for stream OUT ep 

In stream mode, when fast-forwarding TRBs, the stream number
is not cleared causing the new stream to not get assigned. So
we don't want controller to carry on transfers when short packet
is received. So disable the CSP for stream capable endpoint.

This is based on the 3.30a Programming guide, where table 3-1
device descriptor structure field definitions says for CSP bit
If this bit is 0, the controller generates an XferComplete event
and remove the stream. So if we keep CSP as 1 then switching between
streams would not happen as in stream mode, when fast-forwarding
TRBs, the stream number is not cleared causing the new stream to not get
assigned.

Signed-off-by: Tejas Joglekar <joglekar@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Tejas Joglekar 2018-12-10 16:08:13 +05:30 committed by Felipe Balbi
parent cc10ce0c51
commit 244add8ebf
1 changed files with 6 additions and 2 deletions
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8
drivers/usb/dwc3/gadget.c
View File

@ -986,9 +986,13 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb,
usb_endpoint_type(dep->endpoint.desc));
}
/* always enable Continue on Short Packet */
/*
* Enable Continue on Short Packet
* when endpoint is not a stream capable
*/
if (usb_endpoint_dir_out(dep->endpoint.desc)) {
trb->ctrl |= DWC3_TRB_CTRL_CSP;
if (!dep->stream_capable)
trb->ctrl |= DWC3_TRB_CTRL_CSP;
if (short_not_ok)
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;