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 18:47:07 +0000 (19:47 +0100)
commitb59d70c07ab77149082aa80c9d56c30950e28d36
tree1c5776c0204f19e2133a24312523bf5989dbe07a
parentdfb22b6810c76ac0afb4dd33c1be9cea64fe2765
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