linux-kernel - Re: [PATCH v2 2/3] usb: chipidea: Hook into mux framework to toggle usb switch

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Message-ID: <20170718044111.GA13320@b29397-desktop>
Date:   Tue, 18 Jul 2017 12:41:11 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Stephen Boyd <stephen.boyd@...aro.org>
CC:     Peter Chen <Peter.Chen@....com>, <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        <devicetree@...r.infradead.org>,
        Andy Gross <andy.gross@...aro.org>,
        Peter Rosin <peda@...ntia.se>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/3] usb: chipidea: Hook into mux framework to toggle
 usb switch

On Fri, Jul 14, 2017 at 02:40:04PM -0700, Stephen Boyd wrote:
>  
> @@ -175,6 +176,10 @@ static int host_start(struct ci_hdrc *ci)
>  		if (ci_otg_is_fsm_mode(ci)) {
>  			otg->host = &hcd->self;
>  			hcd->self.otg_port = 1;
> +		} else {
> +			ret = mux_control_select(ci->platdata->usb_switch, 1);

It is better to use MACRO for 1 and 0.

> +			if (ret)
> +				goto disable_reg;
>  		}
>  	}
>  
> @@ -195,6 +200,8 @@ static void host_stop(struct ci_hdrc *ci)
>  	struct usb_hcd *hcd = ci->hcd;
>  
>  	if (hcd) {
> +		if (!ci_otg_is_fsm_mode(ci))
> +			mux_control_deselect(ci->platdata->usb_switch);
>  		if (ci->platdata->notify_event)
>  			ci->platdata->notify_event(ci,
>  				CI_HDRC_CONTROLLER_STOPPED_EVENT);
> diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
> index d68b125796f9..deb18099e168 100644
> --- a/drivers/usb/chipidea/udc.c
> +++ b/drivers/usb/chipidea/udc.c
> @@ -22,6 +22,7 @@
>  #include <linux/usb/gadget.h>
>  #include <linux/usb/otg-fsm.h>
>  #include <linux/usb/chipidea.h>
> +#include <linux/mux/consumer.h>
>  
>  #include "ci.h"
>  #include "udc.h"
> @@ -1964,16 +1965,26 @@ void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
>  
>  static int udc_id_switch_for_device(struct ci_hdrc *ci)
>  {
> +	int ret = 0;
> +
>  	if (ci->is_otg)
>  		/* Clear and enable BSV irq */
>  		hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
>  					OTGSC_BSVIS | OTGSC_BSVIE);
>  
> -	return 0;
> +	if (!ci_otg_is_fsm_mode(ci))
> +		ret = mux_control_select(ci->platdata->usb_switch, 0);
> +
> +	if (ci->is_otg && ret)
> +		hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);

Should use !ret?

Peter

> +
> +	return ret;
>  }
>  
>  static void udc_id_switch_for_host(struct ci_hdrc *ci)
>  {
> +	mux_control_deselect(ci->platdata->usb_switch);
> +
>  	/*
>  	 * host doesn't care B_SESSION_VALID event
>  	 * so clear and disbale BSV irq
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index c5fdfcf99828..3b27e333de1d 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -9,6 +9,7 @@
>  #include <linux/usb/otg.h>
>  
>  struct ci_hdrc;
> +struct mux_control;
>  
>  /**
>   * struct ci_hdrc_cable - structure for external connector cable state tracking
> @@ -74,6 +75,7 @@ struct ci_hdrc_platform_data {
>  	/* VBUS and ID signal state tracking, using extcon framework */
>  	struct ci_hdrc_cable		vbus_extcon;
>  	struct ci_hdrc_cable		id_extcon;
> +	struct mux_control		*usb_switch;
>  	u32			phy_clkgate_delay_us;
>  };
>  
> -- 
> 2.10.0.297.gf6727b0
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 

Best Regards,
Peter Chen

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