diff mbox series

[1/4] usb: typec: tcpm: fix cc role at port reset

Message ID 20230313025843.17162-2-frank.wang@rock-chips.com
State Superseded
Headers show
Series Fix some defects related Type-C TCPM | expand

Commit Message

Frank Wang March 13, 2023, 2:58 a.m. UTC
In the current implementation, the tcpm set CC1/CC2 role to open when
it do port reset would cause the VBUS removed by the Type-C partner.

The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
in DRP initialization and connection detection.

So set CC1/CC2 to Rd to fix it.

Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Heikki Krogerus March 14, 2023, 9:20 a.m. UTC | #1
On Mon, Mar 13, 2023 at 10:58:40AM +0800, Frank Wang wrote:
> In the current implementation, the tcpm set CC1/CC2 role to open when
> it do port reset would cause the VBUS removed by the Type-C partner.
> 
> The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
> role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
> in DRP initialization and connection detection.
> 
> So set CC1/CC2 to Rd to fix it.
> 
> Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index a0d943d785800..66de02a56f512 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
>  		break;
>  	case PORT_RESET:
>  		tcpm_reset_port(port);
> -		tcpm_set_cc(port, TYPEC_CC_OPEN);
> +		tcpm_set_cc(port, TYPEC_CC_RD);
>  		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
>  			       PD_T_ERROR_RECOVERY);
>  		break;

Will this work if the port is for example source only?

thanks,
Frank Wang March 15, 2023, 2:55 a.m. UTC | #2
Hi Heikki,

On 2023/3/14 17:20, Heikki Krogerus wrote:
> On Mon, Mar 13, 2023 at 10:58:40AM +0800, Frank Wang wrote:
>> In the current implementation, the tcpm set CC1/CC2 role to open when
>> it do port reset would cause the VBUS removed by the Type-C partner.
>>
>> The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
>> role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
>> in DRP initialization and connection detection.
>>
>> So set CC1/CC2 to Rd to fix it.
>>
>> Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
>> ---
>>   drivers/usb/typec/tcpm/tcpm.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
>> index a0d943d785800..66de02a56f512 100644
>> --- a/drivers/usb/typec/tcpm/tcpm.c
>> +++ b/drivers/usb/typec/tcpm/tcpm.c
>> @@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
>>   		break;
>>   	case PORT_RESET:
>>   		tcpm_reset_port(port);
>> -		tcpm_set_cc(port, TYPEC_CC_OPEN);
>> +		tcpm_set_cc(port, TYPEC_CC_RD);
>>   		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
>>   			       PD_T_ERROR_RECOVERY);
>>   		break;
> Will this work if the port is for example source only?

Yeah, this only set at port reset stage and CC value will be set again
(Rd for Sink, Rp_* for Source) when start toggling.

BR.
Frank
Heikki Krogerus March 17, 2023, 11:24 a.m. UTC | #3
On Wed, Mar 15, 2023 at 10:55:20AM +0800, Frank Wang wrote:
> Hi Heikki,
> 
> On 2023/3/14 17:20, Heikki Krogerus wrote:
> > On Mon, Mar 13, 2023 at 10:58:40AM +0800, Frank Wang wrote:
> > > In the current implementation, the tcpm set CC1/CC2 role to open when
> > > it do port reset would cause the VBUS removed by the Type-C partner.
> > > 
> > > The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
> > > role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
> > > in DRP initialization and connection detection.
> > > 
> > > So set CC1/CC2 to Rd to fix it.
> > > 
> > > Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
> > > ---
> > >   drivers/usb/typec/tcpm/tcpm.c | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > > index a0d943d785800..66de02a56f512 100644
> > > --- a/drivers/usb/typec/tcpm/tcpm.c
> > > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > > @@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
> > >   		break;
> > >   	case PORT_RESET:
> > >   		tcpm_reset_port(port);
> > > -		tcpm_set_cc(port, TYPEC_CC_OPEN);
> > > +		tcpm_set_cc(port, TYPEC_CC_RD);
> > >   		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
> > >   			       PD_T_ERROR_RECOVERY);
> > >   		break;
> > Will this work if the port is for example source only?
> 
> Yeah, this only set at port reset stage and CC value will be set again
> (Rd for Sink, Rp_* for Source) when start toggling.

Okay. Let's wait for comments from Guenter.

thanks,
Guenter Roeck March 17, 2023, 12:47 p.m. UTC | #4
On 3/17/23 04:24, Heikki Krogerus wrote:
> On Wed, Mar 15, 2023 at 10:55:20AM +0800, Frank Wang wrote:
>> Hi Heikki,
>>
>> On 2023/3/14 17:20, Heikki Krogerus wrote:
>>> On Mon, Mar 13, 2023 at 10:58:40AM +0800, Frank Wang wrote:
>>>> In the current implementation, the tcpm set CC1/CC2 role to open when
>>>> it do port reset would cause the VBUS removed by the Type-C partner.
>>>>
>>>> The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
>>>> role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
>>>> in DRP initialization and connection detection.
>>>>
>>>> So set CC1/CC2 to Rd to fix it.
>>>>
>>>> Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
>>>> ---
>>>>    drivers/usb/typec/tcpm/tcpm.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
>>>> index a0d943d785800..66de02a56f512 100644
>>>> --- a/drivers/usb/typec/tcpm/tcpm.c
>>>> +++ b/drivers/usb/typec/tcpm/tcpm.c
>>>> @@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
>>>>    		break;
>>>>    	case PORT_RESET:
>>>>    		tcpm_reset_port(port);
>>>> -		tcpm_set_cc(port, TYPEC_CC_OPEN);
>>>> +		tcpm_set_cc(port, TYPEC_CC_RD);
>>>>    		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
>>>>    			       PD_T_ERROR_RECOVERY);
>>>>    		break;
>>> Will this work if the port is for example source only?
>>
>> Yeah, this only set at port reset stage and CC value will be set again
>> (Rd for Sink, Rp_* for Source) when start toggling.
> 
> Okay. Let's wait for comments from Guenter.
> 

Figure 4-20 is specifically for dual role ports. Also, start toggling would not
happen if the low level driver doesn't have a start_toggling callback. I think this
may require some tweaking based on the port type or, rather, tcpm_default_state().
Something like

	tcpm_set_cc(port, tcpm_default_state(port) == SNK_UNATTACHED ? TYPEC_CC_RD : tcpm_rp_cc(port));

Thanks,
Guenter
diff mbox series

Patch

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index a0d943d785800..66de02a56f512 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -4851,7 +4851,7 @@  static void run_state_machine(struct tcpm_port *port)
 		break;
 	case PORT_RESET:
 		tcpm_reset_port(port);
-		tcpm_set_cc(port, TYPEC_CC_OPEN);
+		tcpm_set_cc(port, TYPEC_CC_RD);
 		tcpm_set_state(port, PORT_RESET_WAIT_OFF,
 			       PD_T_ERROR_RECOVERY);
 		break;