linux-kernel - Re: [RFC PATCH] usb: dwc3: host: add support for OTG in DWC3 host driver

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Date:   Wed, 04 Jan 2017 15:32:40 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Manish Narani <manish.narani@...inx.com>, robh+dt@...nel.org,
        mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
        michal.simek@...inx.com, soren.brinkmann@...inx.com,
        gregkh@...uxfoundation.org, mathias.nyman@...el.com, agraf@...e.de,
        bharatku@...inx.com, punnaiah.choudary.kalluri@...inx.com,
        dhdang@....com, marc.zyngier@....com, mnarani@...inx.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     anirudh@...inx.com, anuragku@...inx.com
Subject: Re: [RFC PATCH] usb: dwc3: host: add support for OTG in DWC3 host driver


Hi,

Manish Narani <manish.narani@...inx.com> writes:
> This patch adds support for OTG host mode initialization in DWC3
> host driver. Before the host initialization sequence begins. The
> driver has to make sure the no OTG peripheral mode is enabled.
>
> Signed-off-by: Manish Narani <mnarani@...inx.com>
> ---
>  drivers/usb/dwc3/host.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index 487f0ff..4caa3fe 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -16,6 +16,8 @@
>   */
>  
>  #include <linux/platform_device.h>
> +#include <linux/usb.h>
> +#include <linux/usb/hcd.h>
>  
>  #include "core.h"
>  
> @@ -111,6 +113,18 @@ int dwc3_host_init(struct dwc3 *dwc)
>  	phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
>  			  dev_name(dwc->dev));
>  
> +	if (dwc->dr_mode == USB_DR_MODE_OTG) {
> +		struct usb_phy *phy;
> +		/* Switch otg to host mode */
> +		phy = usb_get_phy(USB_PHY_TYPE_USB3);
> +		if (!IS_ERR(phy)) {
> +			if (phy && phy->otg)
> +				otg_set_host(phy->otg,
> +						(struct usb_bus *)(long)1);
> +			usb_put_phy(phy);
> +		}
> +	}

NAK. Don't change default mode for everybody. Default mode should
actually be peripheral, but let's not touch whatever HW designer has
set; at least for now.

-- 
balbi

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