| Message ID | 20170103080031.GC14542@b29397-desktop (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | Andy Gross |
| Headers | show |
On Wed, Jan 11, 2017 at 04:32:34PM -0800, Stephen Boyd wrote: > Quoting Peter Chen (2017-01-03 00:00:31) > > On Wed, Dec 28, 2016 at 02:56:57PM -0800, Stephen Boyd wrote: > > > From: Peter Chen <peter.chen@nxp.com> > > > > > > At some situations, the vbus may already be there before starting > > > gadget. So we need to check vbus event after switch to gadget in > > > order to handle missing vbus event. The typical use cases are plugging > > > vbus cable before driver load or the vbus has already been there > > > after stopping host but before starting gadget. > > > > > > Signed-off-by: Peter Chen <peter.chen@nxp.com> > > > Tested-by: Stephen Boyd <stephen.boyd@linaro.org> > > > Reviewed-by: Stephen Boyd <stephen.boyd@linaro.org> > > > [sboyd@codeaurora.org: Modify comment text per list discussion] > > > Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> > > > --- > > > drivers/usb/chipidea/core.c | 4 ---- > > > drivers/usb/chipidea/otg.c | 14 +++++++++----- > > > drivers/usb/chipidea/udc.c | 2 ++ > > > 3 files changed, 11 insertions(+), 9 deletions(-) > > > > > > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c > > > index 8a020ebbbe2f..37f888e31f10 100644 > > > --- a/drivers/usb/chipidea/core.c > > > +++ b/drivers/usb/chipidea/core.c > > > @@ -979,10 +979,6 @@ static int ci_hdrc_probe(struct platform_device *pdev) > > > } > > > > > > if (!ci_otg_is_fsm_mode(ci)) { > > > - /* only update vbus status for peripheral */ > > > - if (ci->role == CI_ROLE_GADGET) > > > - ci_handle_vbus_change(ci); > > > - > > > ret = ci_role_start(ci, ci->role); > > > if (ret) { > > > dev_err(dev, "can't start %s role\n", > > > diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c > > > index 695f3fe3ae21..c972ed23b8ec 100644 > > > --- a/drivers/usb/chipidea/otg.c > > > +++ b/drivers/usb/chipidea/otg.c > > > @@ -134,9 +134,9 @@ void ci_handle_vbus_change(struct ci_hdrc *ci) > > > if (!ci->is_otg) > > > return; > > > > > > - if (hw_read_otgsc(ci, OTGSC_BSV)) > > > + if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active) > > > usb_gadget_vbus_connect(&ci->gadget); > > > - else > > > + else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active) > > > usb_gadget_vbus_disconnect(&ci->gadget); > > > } > > > > > > @@ -175,10 +175,14 @@ static void ci_handle_id_switch(struct ci_hdrc *ci) > > > > > > ci_role_stop(ci); > > > > > > - if (role == CI_ROLE_GADGET) > > > + if (role == CI_ROLE_GADGET && > > > + IS_ERR(ci->platdata->vbus_extcon.edev)) > > > /* > > > - * wait vbus lower than OTGSC_BSV before connecting > > > - * to host > > > + * wait vbus lower than OTGSC_BSV before connecting to > > > + * host. If connecting status is from an external > > > + * connector instead of register, we don't need to care > > > + * vbus on the board, since it will not affect external > > > + * connector status. > > > */ > > > hw_wait_vbus_lower_bsv(ci); > > > > > > diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c > > > index 732b281485de..0db56fb7e9e9 100644 > > > --- a/drivers/usb/chipidea/udc.c > > > +++ b/drivers/usb/chipidea/udc.c > > > @@ -1961,6 +1961,8 @@ static int udc_id_switch_for_device(struct ci_hdrc *ci) > > > /* Clear and enable BSV irq */ > > > hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE, > > > OTGSC_BSVIS | OTGSC_BSVIE); > > > + /* vbus change may has already been occurred */ > > > + ci_handle_vbus_change(ci); > > > > > > return 0; > > > > After thinking more, the above change will affect OTG FSM which calls > > this API too, but handle vbus change later, see ci_otg_start_host and > > ci_otg_start_gadget. How about changing patch like below: > > Ok. I'll give it a spin but I think that should work too. I don't have > any hardware to test the OTG FSM to make sure things don't break. ci_handle_id_switch is only called at non OTG FSM mode, so it will not affect OTG FSM.
diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c index 695f3fe..10236fe 100644 --- a/drivers/usb/chipidea/otg.c +++ b/drivers/usb/chipidea/otg.c @@ -134,9 +134,9 @@ void ci_handle_vbus_change(struct ci_hdrc *ci) if (!ci->is_otg) return; - if (hw_read_otgsc(ci, OTGSC_BSV)) + if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active) usb_gadget_vbus_connect(&ci->gadget); - else + else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active) usb_gadget_vbus_disconnect(&ci->gadget); } @@ -175,14 +175,21 @@ static void ci_handle_id_switch(struct ci_hdrc *ci) ci_role_stop(ci); - if (role == CI_ROLE_GADGET) + if (role == CI_ROLE_GADGET && + IS_ERR(ci->platdata->vbus_extcon.edev)) /* - * wait vbus lower than OTGSC_BSV before connecting - * to host + * Wait vbus lower than OTGSC_BSV before connecting + * to host. If connecting status is from an external + * connector instead of register, we don't need to + * care vbus on the board, since it will not affect + * external connector status. */ hw_wait_vbus_lower_bsv(ci); ci_role_start(ci, role); + /* vbus change may have already occurred */ + if (role == CI_ROLE_GADGET) + ci_handle_vbus_change(ci); } } /**