linux-kernel - Re: [PATCH] usb-musb: keep VBUS on when device is disconnected

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Message-ID: <20170511202726.GZ3489@atomide.com>
Date:   Thu, 11 May 2017 13:27:27 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Bin Liu <b-liu@...com>,
        Moreno Bartalucci <moreno.bartalucci@...norama.it>,
        Lars Melin <larsm17@...il.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alessio Igor Bogani <abogani@...nel.org>
Subject: Re: [PATCH] usb-musb: keep VBUS on when device is disconnected

* Tony Lindgren <tony@...mide.com> [170511 13:26]:
> diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
> --- a/drivers/usb/musb/musb_dsps.c
> +++ b/drivers/usb/musb/musb_dsps.c
> @@ -270,6 +270,10 @@ static int dsps_check_status(struct musb *musb, void *unused)
>  		musb_writel(musb->ctrl_base, wrp->coreintr_set,
>  			    MUSB_INTR_VBUSERROR << wrp->usb_shift);
>  		break;
> +	case OTG_STATE_A_HOST:
> +		if (glue->vbus_irq)
> +			dsps_mod_timer(glue, 20000);	/* 20s */
> +		break;
>  	default:
>  		break;
>  	}
> -- 

Heh that's the wrong way around.. I think we can leave out the check
for vbus_irq.

8< ---------------
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -270,6 +270,10 @@ static int dsps_check_status(struct musb *musb, void *unused)
 		musb_writel(musb->ctrl_base, wrp->coreintr_set,
 			    MUSB_INTR_VBUSERROR << wrp->usb_shift);
 		break;
+	case OTG_STATE_A_HOST:
+		/* Keep VBUS on after disconnect for 20 seconds */
+		dsps_mod_timer(glue, 20000);
+		break;
 	default:
 		break;
 	}
-- 
2.13.0