usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts
authorPeter Chen <peter.chen@freescale.com>
Wed, 14 Aug 2013 09:44:12 +0000 (12:44 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 14 Aug 2013 19:37:20 +0000 (12:37 -0700)
commit22fa84455a2a80566ead8efe4b5e629f2375da60
treec77615fc9011a7ab64dbe17082f85f0ae1b36c3d
parenta107f8c505cd8606ae192d24c70b380e980fbe67
usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts

When the gadget role starts, we need to make sure the vbus is lower
than OTGSC_BSV, or there will be an vbus interrupt since we use
B_SESSION_VALID as vbus interrupt to indicate connect and disconnect.
When the host role starts, it may not be useful to wait vbus to lower
than OTGSC_BSV, but it can indicate some hardware problems like the
vbus is still higher than OTGSC_BSV after we disconnect to host some
time later (5000 milliseconds currently), which is obvious not correct.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/chipidea/ci.h
drivers/usb/chipidea/core.c
drivers/usb/chipidea/otg.c