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| author |   Bin Liu <b-liu@ti.com> | 2018-12-18 07:58:04 -0600 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-18 15:46:31 +0100 |
| commit | 6010abf2c2c0e382d7e8ee44bd11f343aae90cce (patch) | |
| tree | 368377270dc06ddbe5c54fe48913957c6f03119d /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | usb: renesas_usbhs: add support for RZ/G2E (diff) | |
| download | wireguard-linux-6010abf2c2c0e382d7e8ee44bd11f343aae90cce.tar.xz wireguard-linux-6010abf2c2c0e382d7e8ee44bd11f343aae90cce.zip | |
usb: musb: dsps: fix otg state machine
Due to lack of ID pin interrupt event on AM335x devices, the musb dsps
driver uses polling to detect usb device attach for dual-role port.
But in the case if a micro-A cable adapter is attached without a USB device
attached to the cable, the musb state machine gets stuck in a_wait_vrise
state waiting for the MUSB_CONNECT interrupt which won't happen due to the
usb device is not attached. The state is stuck in a_wait_vrise even after
the micro-A cable is detached, which could cause VBUS retention if then the
dual-role port is attached to a host port.
To fix the problem, make a_wait_vrise as a transient state, then move the
state to either a_wait_bcon for host port or a_idle state for dual-role
port, if no usb device is attached to the port.
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions