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SubjectRe: [PATCH v3 02/11] usb: otg-fsm: support multiple instances
On Fri, Jul 10, 2015 at 04:06:43PM +0800, Li Jun wrote:
> On Wed, Jul 08, 2015 at 01:19:28PM +0300, Roger Quadros wrote:
> > Move the state_changed variable into struct otg_fsm
> > so that we can support multiple instances.
> >
> I am not sure if multiple instances may happen since OTG protocol requires
> only one OTG port can be equipped on OTG device.
>

It is ok the software can support more than spec requires, the user can
only use one and the spec may change in future :)

> Li Jun
>
> > Signed-off-by: Roger Quadros <rogerq@ti.com>
> > ---
> > drivers/usb/common/usb-otg-fsm.c | 10 ++++------
> > include/linux/usb/otg-fsm.h | 1 +
> > 2 files changed, 5 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/usb/common/usb-otg-fsm.c b/drivers/usb/common/usb-otg-fsm.c
> > index 61d538a..42c6376 100644
> > --- a/drivers/usb/common/usb-otg-fsm.c
> > +++ b/drivers/usb/common/usb-otg-fsm.c
> > @@ -61,8 +61,6 @@ static int otg_set_protocol(struct otg_fsm *fsm, int protocol)
> > return 0;
> > }
> >
> > -static int state_changed;
> > -
> > /* Called when leaving a state. Do state clean up jobs here */
> > static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state old_state)
> > {
> > @@ -123,7 +121,7 @@ static void otg_leave_state(struct otg_fsm *fsm, enum usb_otg_state old_state)
> > /* Called when entering a state */
> > static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
> > {
> > - state_changed = 1;
> > + fsm->state_changed = 1;
> > if (fsm->otg->state == new_state)
> > return 0;
>
> "fsm->state_changed = 1;" should be put here, I think.
>

Yes, seems it is the problem at current code.

> Li Jun
>
> > VDBG("Set state: %s\n", usb_otg_state_string(new_state));
> > @@ -248,7 +246,7 @@ int otg_statemachine(struct otg_fsm *fsm)
> > mutex_lock(&fsm->lock);
> >
> > state = fsm->otg->state;
> > - state_changed = 0;
> > + fsm->state_changed = 0;
> > /* State machine state change judgement */
> >
> > switch (state) {
> > @@ -361,7 +359,7 @@ int otg_statemachine(struct otg_fsm *fsm)
> > }
> > mutex_unlock(&fsm->lock);
> >
> > - VDBG("quit statemachine, changed = %d\n", state_changed);
> > - return state_changed;
> > + VDBG("quit statemachine, changed = %d\n", fsm->state_changed);
> > + return fsm->state_changed;
> > }
> > EXPORT_SYMBOL_GPL(otg_statemachine);
> > diff --git a/include/linux/usb/otg-fsm.h b/include/linux/usb/otg-fsm.h
> > index ca508c2..243274f 100644
> > --- a/include/linux/usb/otg-fsm.h
> > +++ b/include/linux/usb/otg-fsm.h
> > @@ -194,6 +194,7 @@ struct otg_fsm {
> > /* Current usb protocol used: 0:undefine; 1:host; 2:client */
> > int protocol;
> > struct mutex lock;
> > + bool state_changed;
> > };
> >
> > struct otg_fsm_ops {
> > --
> > 2.1.4
> >

--

Best Regards,
Peter Chen


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