RE: [PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon
Hi Stephen,
> -Original Message-
> From: linux-usb-ow...@vger.kernel.org [mailto:linux-usb-
> ow...@vger.kernel.org] On Behalf Of Peter Chen
> Sent: Thursday, June 30, 2016 9:27 AM
> To: Stephen Boyd
> Cc: linux-usb@vger.kernel.org; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; linux-arm-...@vger.kernel.org; Andy Gross
> ; Bjorn Andersson ;
> Neil Armstrong ; Arnd Bergmann ;
> Felipe Balbi ; Peter Chen ; Greg
> Kroah-Hartman
> Subject: Re: [PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS
> with vbus extcon
>
> On Wed, Jun 29, 2016 at 06:19:59PM -0700, Stephen Boyd wrote:
> > Quoting Peter Chen (2016-06-28 20:09:13)
> > > On Sun, Jun 26, 2016 at 12:28:25AM -0700, Stephen Boyd wrote:
> > > > Force the OTG state machine to go forward when we're using an
> > > > extcon for vbus detection. In this case, the controller may never
> > > > raise an interrupt for AVVIS, so we need to simulate the event by
> > > > toggling the appropriate OTG fsm bits and kicking the state
> > > > machine again.
> > > >
> > >
> > > Well, I think you may misunderstand the OTG FSM and dual-role.
> > > From my and Felipe's point, there are seldom users for USB FSM,
> > > there are only OTG FSM spec and related OTG certification.
> >
> > Probably yes.
> >
> > >
> > > The OTG FSM needs related SoC support, the vbus will be off at
> > > several states, and the SRP should be supported by SoC.
> > >
> > > By default, the dts needs below properties for disabling it if you
> > > choose otg fsm support at kernel configuration.
> > >
> > > &usbotg1 {
> > > vbus-supply = <®_usb_otg1_vbus>;
> > > srp-disable;
> > > hnp-disable;
> > > adp-disable;
> > > status = "okay";
> > > };
> > >
> > > See Documentation/devicetree/bindings/usb/generic.txt.
> >
> > Does this mean we should be setting all those properties if we're
> > using an extcon for vbus and id?
>
> It is not related to how we know vbus and id. If your controller is otg-
> capable, and you don't want to enable OTG FSM (just want dual-role), you
> should set them at dts since the zImage is multi-platforms, the
> CONFIG_USB_OTG and CONFIG_USB_OTG_FSM may be chosen.
>
> > I have noticed that vbus is powered off after some time when no device
> > is connected and we're in A_HOST state because the timeout for a B
> > device connection happens.
>
> I think it is not you want, but it is OTG compliance.
For simple, if you don't want OTG(i.e HNP&SRP) at all, just needs
dual role, you may disable CONFIG_USB_OTG and CONFIG_USB_OTG_FSM
in your menuconfig, then you don't need touch all those properties.
Li Jun
>
> --
>
> Best Regards,
> Peter Chen
> --
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Re: [PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon
On Wed, Jun 29, 2016 at 06:19:59PM -0700, Stephen Boyd wrote:
> Quoting Peter Chen (2016-06-28 20:09:13)
> > On Sun, Jun 26, 2016 at 12:28:25AM -0700, Stephen Boyd wrote:
> > > Force the OTG state machine to go forward when we're using an
> > > extcon for vbus detection. In this case, the controller may never
> > > raise an interrupt for AVVIS, so we need to simulate the event by
> > > toggling the appropriate OTG fsm bits and kicking the state
> > > machine again.
> > >
> >
> > Well, I think you may misunderstand the OTG FSM and dual-role.
> > From my and Felipe's point, there are seldom users for USB FSM,
> > there are only OTG FSM spec and related OTG certification.
>
> Probably yes.
>
> >
> > The OTG FSM needs related SoC support, the vbus will be off at
> > several states, and the SRP should be supported by SoC.
> >
> > By default, the dts needs below properties for disabling it if you
> > choose otg fsm support at kernel configuration.
> >
> > &usbotg1 {
> > vbus-supply = <®_usb_otg1_vbus>;
> > srp-disable;
> > hnp-disable;
> > adp-disable;
> > status = "okay";
> > };
> >
> > See Documentation/devicetree/bindings/usb/generic.txt.
>
> Does this mean we should be setting all those properties if we're using
> an extcon for vbus and id?
It is not related to how we know vbus and id. If your controller is
otg-capable, and you don't want to enable OTG FSM (just want dual-role),
you should set them at dts since the zImage is multi-platforms, the
CONFIG_USB_OTG and CONFIG_USB_OTG_FSM may be chosen.
> I have noticed that vbus is powered off after
> some time when no device is connected and we're in A_HOST state because
> the timeout for a B device connection happens.
I think it is not you want, but it is OTG compliance.
--
Best Regards,
Peter Chen
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Re: [PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon
On Sun, Jun 26, 2016 at 12:28:25AM -0700, Stephen Boyd wrote:
> Force the OTG state machine to go forward when we're using an
> extcon for vbus detection. In this case, the controller may never
> raise an interrupt for AVVIS, so we need to simulate the event by
> toggling the appropriate OTG fsm bits and kicking the state
> machine again.
>
Well, I think you may misunderstand the OTG FSM and dual-role.
>From my and Felipe's point, there are seldom users for USB FSM,
there are only OTG FSM spec and related OTG certification.
The OTG FSM needs related SoC support, the vbus will be off at
several states, and the SRP should be supported by SoC.
By default, the dts needs below properties for disabling it if you
choose otg fsm support at kernel configuration.
&usbotg1 {
vbus-supply = <®_usb_otg1_vbus>;
srp-disable;
hnp-disable;
adp-disable;
status = "okay";
};
See Documentation/devicetree/bindings/usb/generic.txt.
Peter
> Cc: Peter Chen
> Cc: Greg Kroah-Hartman
> Signed-off-by: Stephen Boyd
> ---
> drivers/usb/chipidea/otg_fsm.c | 17 +
> 1 file changed, 17 insertions(+)
>
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index de8e22ec3902..aab076fc4d82 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -475,6 +475,14 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
> return;
> }
> }
> + /*
> + * Force state machine forward if we use extcon
> + * to detect vbus state (i.e. simulate AVVIS event)
> + */
> + if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
> + fsm->a_vbus_vld = 1;
> + ci_otg_queue_work(ci);
> + }
> /* Disable data pulse irq */
> hw_write_otgsc(ci, OTGSC_DPIE, 0);
>
> @@ -486,6 +494,15 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
>
> fsm->a_bus_drop = 1;
> fsm->a_bus_req = 0;
> + /*
> + * Force state machine forward if we use extcon
> + * to detect vbus state (i.e. simulate AVVIS event)
> + */
> + if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
> + fsm->a_vbus_vld = 0;
> + fsm->b_conn = 0;
> + ci_otg_queue_work(ci);
> + }
> }
> }
>
> --
> 2.9.0.rc2.8.ga28705d
>
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--
Best Regards,
Peter Chen
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[PATCH 08/21] usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon
Force the OTG state machine to go forward when we're using an
extcon for vbus detection. In this case, the controller may never
raise an interrupt for AVVIS, so we need to simulate the event by
toggling the appropriate OTG fsm bits and kicking the state
machine again.
Cc: Peter Chen
Cc: Greg Kroah-Hartman
Signed-off-by: Stephen Boyd
---
drivers/usb/chipidea/otg_fsm.c | 17 +
1 file changed, 17 insertions(+)
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index de8e22ec3902..aab076fc4d82 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -475,6 +475,14 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
return;
}
}
+ /*
+* Force state machine forward if we use extcon
+* to detect vbus state (i.e. simulate AVVIS event)
+*/
+ if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
+ fsm->a_vbus_vld = 1;
+ ci_otg_queue_work(ci);
+ }
/* Disable data pulse irq */
hw_write_otgsc(ci, OTGSC_DPIE, 0);
@@ -486,6 +494,15 @@ static void ci_otg_drv_vbus(struct otg_fsm *fsm, int on)
fsm->a_bus_drop = 1;
fsm->a_bus_req = 0;
+ /*
+* Force state machine forward if we use extcon
+* to detect vbus state (i.e. simulate AVVIS event)
+*/
+ if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
+ fsm->a_vbus_vld = 0;
+ fsm->b_conn = 0;
+ ci_otg_queue_work(ci);
+ }
}
}
--
2.9.0.rc2.8.ga28705d
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