On Wed, Dec 28, 2016 at 02:56:57PM -0800, Stephen Boyd wrote:
> From: Peter Chen <peter.chen@xxxxxxx>
>
> 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@xxxxxxx>
> Tested-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
> Reviewed-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
> [sboyd@xxxxxxxxxxxxxx: Modify comment text per list discussion]
> Signed-off-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
> ---
> 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:
drivers/usb/chipidea/otg.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
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);
}
}
/**
--
2.7.4
--
Best Regards,
Peter Chen
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