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Date: Wed, 3 Jun 2020 13:34:30 +0200
From: Mike Looijmans <mike.looijmans@...ic.nl>
To: linux-usb@...r.kernel.org
CC: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
gregkh@...uxfoundation.org, robh+dt@...nel.org, balbi@...nel.org
Subject: Re: [PATCH] usb: dwc3: Add support for VBUS power control
Oh darn, the "devm_get_regulator..." call in probe got lost in the
rebase+merge. I'll add that in v2.
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands
T: +31 (0) 499 33 69 69
E: mike.looijmans@...icproducts.com
W: www.topicproducts.com
Please consider the environment before printing this e-mail
On 03-06-2020 10:59, Mike Looijmans wrote:
> Support VBUS power control using regulator framework. Enables the regulator
> while the port is in host mode.
>
> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> ---
> .../devicetree/bindings/usb/dwc3.txt | 1 +
> drivers/usb/dwc3/core.c | 30 ++++++++++++++-----
> drivers/usb/dwc3/core.h | 4 +++
> drivers/usb/dwc3/drd.c | 6 ++--
> 4 files changed, 29 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
> index 9946ff9ba735..56bc3f238e2d 100644
> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
> @@ -37,6 +37,7 @@ Optional properties:
> - phys: from the *Generic PHY* bindings
> - phy-names: from the *Generic PHY* bindings; supported names are "usb2-phy"
> or "usb3-phy".
> + - vbus-supply: Regulator handle that provides the VBUS power.
> - resets: set of phandle and reset specifier pairs
> - snps,usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
> - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index edc17155cb2b..a9e58a301446 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);
>
> 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);
--
Mike Looijmans
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