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usb: phy: Add new OTG state OTG_STATE_B_SUSPENDED

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This state is used to handle:-

- Bus suspend followed by cable disconnect: pm usage
count is incremented upon cable connect. Upon bus
suspend, suspend interrupt kicks in otg state machine
which moves device state to OTG_STATE_B_SUSPENDED from
OTG_STATE_B_PERIPHERAL and decrements pm usage count.
Upon cable unplug additional decrement of pm usage count
is prevented. This state also takes care the handling of
cable unplug followed by bus suspend interrupt.

- Host initiated resume after bus suspend: Being in
OTG_STATE_B_SUSPENDED after bus suspend, upon host
initiated resume, wakeup interrupt kicks in otg state machine
which moves device to OTG_STATE_B_PERIPHERAL state by
incrementing pm usage count.

- PC reboot with cable plugged in: After PC shutdown
device goes to OTG_STATE_B_SUSPENDED state. After
PC start power event irq thread kicks in otg state
machine to move device to OTG_STATE_B_PERIPHERAL
state and increments pm usage count.

- Composition switch after bus suspend:
dwc3_gadget_pullup() kicks in otg state machine to
move device state from OTG_STATE_B_SUSPENDED to
OTG_STATE_B_PERIPHERAL and increments pm usage count
to prevent runtime suspend during device enumeration.

Also, remove pm_runtime_set_active() which sets the PM
runtime stauts as active to avoid pm_runtime_get_sync() failures
which explicitly checks for runtime pm status. For example, if
status is active, pm_runtime_get_sync() will just increments the
counter without actually resuming the device.

Change-Id: Id33b81911ef3894a00802b3e553840b9447f6269
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
[jackp@codeaurora.org: cherry-pick only phy.h and common.c]
Signed-off-by: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Hemant Kumar 2015-04-07 14:42:39 -07:00 • committed by David Keitel
parent 5bf0c1d26a
commit 0cfa0c949f
2 changed files with 2 additions and 0 deletions
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1
drivers/usb/common/common.c
View file

@ -34,6 +34,7 @@ const char *usb_otg_state_string(enum usb_otg_state state)
[OTG_STATE_B_PERIPHERAL] = "b_peripheral",
[OTG_STATE_B_WAIT_ACON] = "b_wait_acon",
[OTG_STATE_B_HOST] = "b_host",
[OTG_STATE_B_SUSPEND] = "b_suspend",
};
if (state < 0 || state >= ARRAY_SIZE(names))

1
include/linux/usb/phy.h
View file

@ -44,6 +44,7 @@ enum usb_otg_state {
OTG_STATE_B_IDLE,
OTG_STATE_B_SRP_INIT,
OTG_STATE_B_PERIPHERAL,
OTG_STATE_B_SUSPEND,
/* extra dual-role default-b states */
OTG_STATE_B_WAIT_ACON,