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SubjectRe: [PATCH v6 1/8] usb: dwc3: Registering a role switch in the DRD code.
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On 28/11/2019 05:09, John Stultz wrote:
> From: Yu Chen <chenyu56@huawei.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@linuxfoundation.org>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> CC: ShuFan Lee <shufan_lee@richtek.com>
> Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
> Cc: Yu Chen <chenyu56@huawei.com>
> Cc: Felipe Balbi <balbi@kernel.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
> Cc: Jun Li <lijun.kernel@gmail.com>
> Cc: Valentin Schneider <valentin.schneider@arm.com>
> Cc: Jack Pham <jackp@codeaurora.org>
> Cc: linux-usb@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Suggested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Yu Chen <chenyu56@huawei.com>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Change-Id: Ibd89b7eb3e59688895a2d317f3515e6d2705c6f3
> ---
> v2: Fix role_sw and role_switch_default_mode descriptions as
> reported by kbuild test robot <lkp@intel.com>
>
> v3: Split out the role-switch-default-host logic into its own
> patch
>
> v5: Drop selecting CONFIG_USB_ROLE_SWITCH & ifdef dependent code
>
> v6: Fix build issue Reported-by: kbuild test robot <lkp@intel.com>
> ---
> 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 1c8b349379af..6f19e9891767 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>
> @@ -951,6 +952,7 @@ 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
> @@ -1084,6 +1086,7 @@ 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
> +#define ROLE_SWITCH 1
> +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
> +#endif
> +
> int dwc3_drd_init(struct dwc3 *dwc)
> {
> int ret, irq;
> @@ -484,7 +551,12 @@ int dwc3_drd_init(struct dwc3 *dwc)
> if (IS_ERR(dwc->edev))
> return PTR_ERR(dwc->edev);
>
> - if (dwc->edev) {
> + if (ROLE_SWITCH &&
> + device_property_read_bool(dwc->dev, "usb-role-switch")) {
> + ret = dwc3_setup_role_switch(dwc);
> + if (ret < 0)
> + return ret;
> + } else if (dwc->edev) {
> dwc->edev_nb.notifier_call = dwc3_drd_notifier;
> ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
> &dwc->edev_nb);
> @@ -531,6 +603,9 @@ void dwc3_drd_exit(struct dwc3 *dwc)
> {
> unsigned long flags;
>
> + if (dwc->role_sw)
> + usb_role_switch_unregister(dwc->role_sw);
> +
> if (dwc->edev)
> extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
> &dwc->edev_nb);
>

This again I've used on the qcs404 and it works nicely.

Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

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