linux-kernel - Re: [PATCH v3 07/19] usb: dwc3: Registering a role switch in the DRD code.

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Message-ID: <87wo977o7e.fsf@kernel.org>
Date:   Fri, 31 Jan 2020 15:25:09 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        gregkh@...uxfoundation.org, jackp@...eaurora.org,
        bjorn.andersson@...aro.org
Cc:     linux-kernel@...r.kernel.org, Yu Chen <chenyu56@...wei.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        ShuFan Lee <shufan_lee@...htek.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jun Li <lijun.kernel@...il.com>,
        Valentin Schneider <valentin.schneider@....com>,
        devicetree@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v3 07/19] usb: dwc3: Registering a role switch in the DRD code.


Hi,

Bryan O'Donoghue <bryan.odonoghue@...aro.org> writes:
> From: Yu Chen <chenyu56@...wei.com>
>
> The Type-C drivers use USB role switch API to inform the
> system about the negotiated data role, so registering a role
> switch in the DRD code in order to support platforms with
> USB Type-C connectors.
>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> CC: ShuFan Lee <shufan_lee@...htek.com>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Cc: Yu Chen <chenyu56@...wei.com>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Jun Li <lijun.kernel@...il.com>
> Cc: Valentin Schneider <valentin.schneider@....com>
> Cc: Jack Pham <jackp@...eaurora.org>
> Cc: linux-usb@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Suggested-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Yu Chen <chenyu56@...wei.com>
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  drivers/usb/dwc3/core.h |  3 ++
>  drivers/usb/dwc3/drd.c  | 77 ++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 79 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 77c4a9abe365..a99e57636172 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -25,6 +25,7 @@
>  #include <linux/usb/ch9.h>
>  #include <linux/usb/gadget.h>
>  #include <linux/usb/otg.h>
> +#include <linux/usb/role.h>
>  #include <linux/ulpi/interface.h>
>  
>  #include <linux/phy/phy.h>
> @@ -953,6 +954,7 @@ struct dwc3_scratchpad_array {
>   * @hsphy_mode: UTMI phy mode, one of following:
>   *		- USBPHY_INTERFACE_MODE_UTMI
>   *		- USBPHY_INTERFACE_MODE_UTMIW
> + * @role_sw: usb_role_switch handle
>   * @usb2_phy: pointer to USB2 PHY
>   * @usb3_phy: pointer to USB3 PHY
>   * @usb2_generic_phy: pointer to USB2 PHY
> @@ -1086,6 +1088,7 @@ struct dwc3 {
>  	struct extcon_dev	*edev;
>  	struct notifier_block	edev_nb;
>  	enum usb_phy_interface	hsphy_mode;
> +	struct usb_role_switch	*role_sw;
>  
>  	u32			fladj;
>  	u32			irq_gadget;
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index c946d64142ad..3b57d2ddda93 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -476,6 +476,73 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
>  	return edev;
>  }
>  
> +#ifdef CONFIG_USB_ROLE_SWITCH

it's best to use if (IS_*()) macros.

> +#define ROLE_SWITCH 1

this wouldn't be neceessary

> +static int dwc3_usb_role_switch_set(struct device *dev, enum usb_role role)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	u32 mode;
> +
> +	switch (role) {
> +	case USB_ROLE_HOST:
> +		mode = DWC3_GCTL_PRTCAP_HOST;
> +		break;
> +	case USB_ROLE_DEVICE:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	default:
> +		mode = DWC3_GCTL_PRTCAP_DEVICE;
> +		break;
> +	}
> +
> +	dwc3_set_mode(dwc, mode);
> +	return 0;
> +}
> +
> +static enum usb_role dwc3_usb_role_switch_get(struct device *dev)
> +{
> +	struct dwc3 *dwc = dev_get_drvdata(dev);
> +	unsigned long flags;
> +	enum usb_role role;
> +
> +	spin_lock_irqsave(&dwc->lock, flags);
> +	switch (dwc->current_dr_role) {
> +	case DWC3_GCTL_PRTCAP_HOST:
> +		role = USB_ROLE_HOST;
> +		break;
> +	case DWC3_GCTL_PRTCAP_DEVICE:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	case DWC3_GCTL_PRTCAP_OTG:
> +		role = dwc->current_otg_role;
> +		break;
> +	default:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	}
> +	spin_unlock_irqrestore(&dwc->lock, flags);
> +	return role;
> +}
> +
> +static int dwc3_setup_role_switch(struct dwc3 *dwc)
> +{
> +	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +
> +	dwc3_role_switch.fwnode = dev_fwnode(dwc->dev);
> +	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> +	dwc3_role_switch.get = dwc3_usb_role_switch_get;
> +	dwc->role_sw = usb_role_switch_register(dwc->dev, &dwc3_role_switch);
> +	if (IS_ERR(dwc->role_sw))
> +		return PTR_ERR(dwc->role_sw);
> +
> +	dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
> +	return 0;
> +}
> +#else
> +#define ROLE_SWITCH 0
> +#define dwc3_setup_role_switch(x) 0

or this

-- 
balbi

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