[v3,02/11] usb: otg-fsm: support multiple instances
diff mbox

Message ID 1436350777-28056-3-git-send-email-rogerq@ti.com
State New
Headers show

Commit Message

Roger Quadros July 8, 2015, 10:19 a.m. UTC
Move the state_changed variable into struct otg_fsm
so that we can support multiple instances.

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(-)

Comments

Li Jun July 10, 2015, 8:06 a.m. UTC | #1
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.

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.

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
> 
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Peter Chen July 13, 2015, 1:39 a.m. UTC | #2
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
> >
Roger Quadros July 17, 2015, 11:17 a.m. UTC | #3
On 13/07/15 04:39, Peter Chen wrote:
> 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.

Right. But I'll fix it as per Li's suggestion.

cheers,
-roger

> 
>> 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
>>>
> 
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Patch
diff mbox

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;
 	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 {