]> www.infradead.org Git - users/dwmw2/linux.git/commit
usb: dwc3: gadget: Disable CSP for stream OUT ep
authorTejas Joglekar <tejas.joglekar@synopsys.com>
Mon, 10 Dec 2018 10:38:13 +0000 (16:08 +0530)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 12 Feb 2019 19:02:17 +0000 (20:02 +0100)
commit2de23f52a08a57d91a6a38d411505ea44a61fe87
tree28aafccdab35b2eb6a45fa7639268c339f29956a
parent813f8c2eddeaa5ac4a6fb389ddf905b6cb42d320
usb: dwc3: gadget: Disable CSP for stream OUT ep

[ Upstream commit 244add8ebfb231c39db9e33b204bd0ce8f24f782 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/usb/dwc3/gadget.c