Commits
Peter E. Berger committed 26c78daade0
USB: io_ti: Add heartbeat to keep idle EP/416 ports from disconnecting When using Edgeport/416 models with newer firmware (sometime after firmware version 4.80.0), idle ports are automatically bounced (disconnected and then reconnected) approximately every 60 seconds. This breaks programs (e.g: minicom) where idle periods are common, normal and expected. I confirmed with the manufacturer (Digi International) that Edgeport/416 models now ship from the factory with firmware that expects periodic "heartbeat" queries from the driver to keep idle ports alive. This patch implements heartbeat support using the mechanism Digi suggested (periodically requesting an I2C descriptor address) that appears effective on Edgeports running the newer firmware (that require it) and benign on Edgeport devices running older firmware. Since we know that Edgeport firmware version 4.80 (the version distributed in /lib/firmware/down3.bin and used for Edgeports that are either running still older versions or have no onboard non-volatile firmware image) does not require heartbeat support, this patch schedules heartbeats only on Edgeport/416 devices, and only if they are running firmware versions newer than 4.80. Signed-off-by: Peter E. Berger <pberger@brimson.com> [johan: minor style changes ] Signed-off-by: Johan Hovold <johan@kernel.org>