Xu Yang b89bbf32fc usb: chipidea: add CI_HDRC_HAS_SHORT_PKT_LIMIT flag ...

[ Upstream commit ec841b8d73 ]

Currently, the imx deivice controller has below limitations:

1. can't generate short packet interrupt if IOC not set in dTD. So if one
   request span more than one dTDs and only the last dTD set IOC, the usb
   request will pending there if no more data comes.
2. the controller can't accurately deliver data to differtent usb requests
   in some cases due to short packet. For example: one usb request span 3
   dTDs, then if the controller received a short packet the next packet
   will go to 2nd dTD of current request rather than the first dTD of next
   request.
3. can't build a bus packet use multiple dTDs. For example: controller
   needs to send one packet of 512 bytes use dTD1 (200 bytes) + dTD2
   (312 bytes), actually the host side will see 200 bytes short packet.

Based on these limits, add CI_HDRC_HAS_SHORT_PKT_LIMIT flag and use it on
imx platforms.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20240923081203.2851768-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-12-14 20:04:07 +01:00

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