linux-kernel - Re: [PATCH v1] usb: chipidea: add CI_HDRC_FORCE_VBUS_ACTIVE

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Date:   Tue, 19 Sep 2023 09:17:49 +0200
From:   J. Neuschäfer <j.neuschaefer@....net>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     peter.chen@...nel.org, gregkh@...uxfoundation.org,
        avifishman70@...il.com, tali.perry1@...il.com, joel@....id.au,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        j.neuschaefer@....net, openbmc@...ts.ozlabs.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] usb: chipidea: add CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS
 flag

On Mon, Sep 18, 2023 at 07:10:28PM +0300, Tomer Maimon wrote:
> Adding CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS flag to modify the vbus_active
> parameter to active in case the ChipIdea USB IP role is device-only and
> there is no otgsc register.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>

I think it would make sense to include this patch as part of the
patchset that uses the functionality to enable NPCM support, so that
reviewers would immediately see the context in which it is used.

Jonathan

> ---
>  drivers/usb/chipidea/otg.c   | 5 ++++-
>  include/linux/usb/chipidea.h | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index f5490f2a5b6b..647e98f4e351 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -130,8 +130,11 @@ enum ci_role ci_otg_role(struct ci_hdrc *ci)
>  
>  void ci_handle_vbus_change(struct ci_hdrc *ci)
>  {
> -	if (!ci->is_otg)
> +	if (!ci->is_otg) {
> +		if (ci->platdata->flags & CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS)
> +			usb_gadget_vbus_connect(&ci->gadget);
>  		return;
> +	}
>  
>  	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)
>  		usb_gadget_vbus_connect(&ci->gadget);
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index 0b4f2d5faa08..5a7f96684ea2 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -64,6 +64,7 @@ struct ci_hdrc_platform_data {
>  #define CI_HDRC_PMQOS			BIT(15)
>  #define CI_HDRC_PHY_VBUS_CONTROL	BIT(16)
>  #define CI_HDRC_HAS_PORTSC_PEC_MISSED	BIT(17)
> +#define CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS	BIT(18)
>  	enum usb_dr_mode	dr_mode;
>  #define CI_HDRC_CONTROLLER_RESET_EVENT		0
>  #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
> -- 
> 2.33.0
> 

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