Re: [PATCH v4] usb: dwc3: Add support for VBUS power control

[Yassine Oudjana]

In-Reply-To: <20200805061744.20404-1-mike.looijmans@xxxxxxxx>

On Wed,  5 Aug 2020 08:17:44 +0200, Mike Looijmans wrote:
> Support VBUS power control using regulator framework. Enables the regulator
> while the port is in host mode.
>
> The "vbus-supply" property can be provided using a usb-connector child node
> and standard devicetree bindings.
>
> Signed-off-by: Mike Looijmans <mike.looijmans@xxxxxxxx>
> ---
> v2: Add missing devm_regulator_get call which got lost during rebase
> v3: Remove devicetree binding, use standard usb-connector
>     Fix probe fail when vbus-supply is not present
> v4: Use devm_regulator_get (without "optional")
>
>  drivers/usb/dwc3/core.c | 34 ++++++++++++++++++++++++++--------
>  drivers/usb/dwc3/core.h |  4 ++++
>  drivers/usb/dwc3/drd.c  |  6 ++----
>  3 files changed, 32 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index edc17155cb2b..abfd043bae21 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -25,6 +25,7 @@
>  #include <linux/of.h>
>  #include <linux/acpi.h>
>  #include <linux/pinctrl/consumer.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/reset.h>
>
>  #include <linux/usb/ch9.h>
> @@ -112,6 +113,23 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode)
>  	dwc->current_dr_role = mode;
>  }
>
> +void dwc3_set_vbus(struct dwc3 *dwc, bool enable)
> +{
> +	int ret;
> +
> +	if (enable != dwc->vbus_reg_enabled) {
> +		if (enable)
> +			ret = regulator_enable(dwc->vbus_reg);
> +		else
> +			ret = regulator_disable(dwc->vbus_reg);
> +		if (!ret)
> +			dwc->vbus_reg_enabled = enable;
> +	}
> +
> +	if (dwc->usb2_phy)
> +		otg_set_vbus(dwc->usb2_phy->otg, enable);
> +}
> +
>  static void __dwc3_set_mode(struct work_struct *work)
>  {
>  	struct dwc3 *dwc = work_to_dwc(work);
> @@ -164,8 +182,7 @@ static void __dwc3_set_mode(struct work_struct *work)
>  		if (ret) {
>  			dev_err(dwc->dev, "failed to initialize host\n");
>  		} else {
> -			if (dwc->usb2_phy)
> -				otg_set_vbus(dwc->usb2_phy->otg, true);
> +			dwc3_set_vbus(dwc, true);
>  			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
>  			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
>  		}
> @@ -173,8 +190,7 @@ static void __dwc3_set_mode(struct work_struct *work)
>  	case DWC3_GCTL_PRTCAP_DEVICE:
>  		dwc3_event_buffers_setup(dwc);
>
> -		if (dwc->usb2_phy)
> -			otg_set_vbus(dwc->usb2_phy->otg, false);
> +		dwc3_set_vbus(dwc, false);
>  		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
>  		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
>
> @@ -1183,8 +1199,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>  	case USB_DR_MODE_PERIPHERAL:
>  		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
>
> -		if (dwc->usb2_phy)
> -			otg_set_vbus(dwc->usb2_phy->otg, false);
> +		dwc3_set_vbus(dwc, false);
>  		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
>  		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
>
> @@ -1198,8 +1213,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>  	case USB_DR_MODE_HOST:
>  		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
>
> -		if (dwc->usb2_phy)
> -			otg_set_vbus(dwc->usb2_phy->otg, true);
> +		dwc3_set_vbus(dwc, true);
>  		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
>  		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
>
> @@ -1470,6 +1484,10 @@ static int dwc3_probe(struct platform_device *pdev)
>
>  	dwc3_get_properties(dwc);
>
> +	dwc->vbus_reg = devm_regulator_get(dev, "vbus");
> +	if (IS_ERR(dwc->vbus_reg))
> +		return PTR_ERR(dwc->vbus_reg);
> +
>  	dwc->reset = devm_reset_control_array_get(dev, true, true);
>  	if (IS_ERR(dwc->reset))
>  		return PTR_ERR(dwc->reset);
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 4c171a8e215f..cee2574d7bf4 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1085,6 +1085,9 @@ struct dwc3 {
>
>  	bool			phys_ready;
>
> +	struct regulator	*vbus_reg;
> +	bool			vbus_reg_enabled;
> +
>  	struct ulpi		*ulpi;
>  	bool			ulpi_ready;
>
> @@ -1397,6 +1400,7 @@ struct dwc3_gadget_ep_cmd_params {
>
>  /* prototypes */
>  void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode);
> +void dwc3_set_vbus(struct dwc3 *dwc, bool enable);
>  void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
>  u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);
>
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index 7db1ffc92bbd..45fdec2d128d 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -384,8 +384,7 @@ void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
>  		if (ret) {
>  			dev_err(dwc->dev, "failed to initialize host\n");
>  		} else {
> -			if (dwc->usb2_phy)
> -				otg_set_vbus(dwc->usb2_phy->otg, true);
> +			dwc3_set_vbus(dwc, true);
>  			if (dwc->usb2_generic_phy)
>  				phy_set_mode(dwc->usb2_generic_phy,
>  					     PHY_MODE_USB_HOST);
> @@ -398,8 +397,7 @@ void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
>  		dwc3_event_buffers_setup(dwc);
>  		spin_unlock_irqrestore(&dwc->lock, flags);
>
> -		if (dwc->usb2_phy)
> -			otg_set_vbus(dwc->usb2_phy->otg, false);
> +		dwc3_set_vbus(dwc, false);
>  		if (dwc->usb2_generic_phy)
>  			phy_set_mode(dwc->usb2_generic_phy,
>  				     PHY_MODE_USB_DEVICE);
> --
> 2.17.1

Tested after fixing a couple of small conflicts.

Tested-by: Yassine Oudjana <y.oudjana@xxxxxxxxxxxxxx>