* [PATCH v4 0/3] Add USB role switch support to DWC2 @ 2020-07-27 9:23 Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property Amelie Delaunay ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Amelie Delaunay @ 2020-07-27 9:23 UTC (permalink / raw) To: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue Cc: linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier, Amelie Delaunay, Martin Blumenstingl When using usb-c connector (but it can also be the case with a micro-b connector), iddig, avalid, bvalid, vbusvalid input signals may not be connected to the DWC2 OTG controller. DWC2 OTG controller features an overriding control of the PHY voltage valid and ID input signals. So, missing signals can be forced using usb role from usb role switch and this override feature. This series adds support for usb role switch to dwc2, by using overriding control of the PHY voltage valid and ID input signals. It has been tested on stm32mp157c-dk2 [1], which has a Type-C connector managed by a Type-C port controller, and connected to USB OTG controller. [1] https://www.st.com/en/evaluation-tools/stm32mp157c-dk2.html Amelie Delaunay (3): dt-bindings: usb: dwc2: add optional usb-role-switch property usb: dwc2: override PHY input signals with usb role switch support usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs --- Changes in v4: - Simplify call to dwc2_force_mode in drd.c - Add error_drd label in probe error path in platform.c Changes in v3: - Fix build issue reported by kernel test robot in drd.c Changes in v2: - Previous DT patch already in stm32-next branch so removed from v2 patchset "ARM: dts: stm32: enable usb-role-switch on USB OTG on stm32mp15xx-dkx" - DWC2 DT bindings update added - Build issue reported by kernel test robot fixed - Martin's comments taken into account --- .../devicetree/bindings/usb/dwc2.yaml | 4 + drivers/usb/dwc2/Kconfig | 1 + drivers/usb/dwc2/Makefile | 2 +- drivers/usb/dwc2/core.h | 9 + drivers/usb/dwc2/drd.c | 180 ++++++++++++++++++ drivers/usb/dwc2/gadget.c | 2 +- drivers/usb/dwc2/params.c | 4 +- drivers/usb/dwc2/platform.c | 20 +- 8 files changed, 217 insertions(+), 5 deletions(-) create mode 100644 drivers/usb/dwc2/drd.c -- 2.17.1 ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property 2020-07-27 9:23 [PATCH v4 0/3] Add USB role switch support to DWC2 Amelie Delaunay @ 2020-07-27 9:23 ` Amelie Delaunay 2020-07-27 17:47 ` Martin Blumenstingl 2020-07-27 9:23 ` [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs Amelie Delaunay 2 siblings, 1 reply; 9+ messages in thread From: Amelie Delaunay @ 2020-07-27 9:23 UTC (permalink / raw) To: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue Cc: linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier, Amelie Delaunay, Martin Blumenstingl This patch documents the usb-role-switch property in dwc2 bindings, now that usb-role-switch support is available in dwc2 driver. Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> --- Documentation/devicetree/bindings/usb/dwc2.yaml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/usb/dwc2.yaml b/Documentation/devicetree/bindings/usb/dwc2.yaml index 9352a8ef60a6..7b226eeffe82 100644 --- a/Documentation/devicetree/bindings/usb/dwc2.yaml +++ b/Documentation/devicetree/bindings/usb/dwc2.yaml @@ -100,6 +100,10 @@ properties: dr_mode: enum: [host, peripheral, otg] + usb-role-switch: + $ref: /schemas/types.yaml#/definitions/flag + description: Support role switch. + g-rx-fifo-size: $ref: /schemas/types.yaml#/definitions/uint32 description: size of rx fifo size in gadget mode. -- 2.17.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property 2020-07-27 9:23 ` [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property Amelie Delaunay @ 2020-07-27 17:47 ` Martin Blumenstingl 0 siblings, 0 replies; 9+ messages in thread From: Martin Blumenstingl @ 2020-07-27 17:47 UTC (permalink / raw) To: Amelie Delaunay Cc: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue, linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier Hello Amelie, thank you for adding this patch! On Mon, Jul 27, 2020 at 11:23 AM Amelie Delaunay <amelie.delaunay@st.com> wrote: > > This patch documents the usb-role-switch property in dwc2 bindings, now > that usb-role-switch support is available in dwc2 driver. > > Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> please add my: Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Martin ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support 2020-07-27 9:23 [PATCH v4 0/3] Add USB role switch support to DWC2 Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property Amelie Delaunay @ 2020-07-27 9:23 ` Amelie Delaunay 2020-07-27 17:55 ` Martin Blumenstingl 2020-07-27 9:23 ` [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs Amelie Delaunay 2 siblings, 1 reply; 9+ messages in thread From: Amelie Delaunay @ 2020-07-27 9:23 UTC (permalink / raw) To: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue Cc: linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier, Amelie Delaunay, Martin Blumenstingl This patch adds support for usb role switch to dwc2, by using overriding control of the PHY voltage valid and ID input signals. iddig signal (ID) can be overridden: - when setting GUSBCFG_FORCEHOSTMODE, iddig input pin is overridden with 1; - when setting GUSBCFG_FORCEDEVMODE, iddig input pin is overridden with 0. avalid/bvalid/vbusvalid signals can be overridden respectively with: - GOTGCTL_AVALOEN + GOTGCTL_AVALOVAL - GOTGCTL_BVALOEN + GOTGCTL_BVALOVAL - GOTGCTL_VBVALEN + GOTGCTL_VBVALOVAL It is possible to determine valid sessions thanks to usb role switch: - if USB_ROLE_NONE then !avalid && !bvalid && !vbusvalid - if USB_ROLE_DEVICE then !avalid && bvalid && vbusvalid - if USB_ROLE_HOST then avalid && !bvalid && vbusvalid Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> --- Changes in v4: - Simplify call to dwc2_force_mode in drd.c - Add error_drd label in probe error path in platform.c Changes in v3: - Fix build issue reported by kernel test robot in drd.c Changes in v2: - Fix build issue reported by kernel test robot - Move call to dwc2_force_mode outside spinlock context - Add dwc2_drd_exit call in probe error path --- drivers/usb/dwc2/Kconfig | 1 + drivers/usb/dwc2/Makefile | 2 +- drivers/usb/dwc2/core.h | 9 ++ drivers/usb/dwc2/drd.c | 180 ++++++++++++++++++++++++++++++++++++ drivers/usb/dwc2/gadget.c | 2 +- drivers/usb/dwc2/platform.c | 20 +++- 6 files changed, 210 insertions(+), 4 deletions(-) create mode 100644 drivers/usb/dwc2/drd.c diff --git a/drivers/usb/dwc2/Kconfig b/drivers/usb/dwc2/Kconfig index 16e1aa304edc..dceb8f32414e 100644 --- a/drivers/usb/dwc2/Kconfig +++ b/drivers/usb/dwc2/Kconfig @@ -47,6 +47,7 @@ config USB_DWC2_PERIPHERAL config USB_DWC2_DUAL_ROLE bool "Dual Role mode" depends on (USB=y && USB_GADGET=y) || (USB_DWC2=m && USB && USB_GADGET) + select USB_ROLE_SWITCH help Select this option if you want the driver to work in a dual-role mode. In this mode both host and gadget features are enabled, and diff --git a/drivers/usb/dwc2/Makefile b/drivers/usb/dwc2/Makefile index 440320cc20a4..2bcd6945df46 100644 --- a/drivers/usb/dwc2/Makefile +++ b/drivers/usb/dwc2/Makefile @@ -3,7 +3,7 @@ ccflags-$(CONFIG_USB_DWC2_DEBUG) += -DDEBUG ccflags-$(CONFIG_USB_DWC2_VERBOSE) += -DVERBOSE_DEBUG obj-$(CONFIG_USB_DWC2) += dwc2.o -dwc2-y := core.o core_intr.o platform.o +dwc2-y := core.o core_intr.o platform.o drd.o dwc2-y += params.o ifneq ($(filter y,$(CONFIG_USB_DWC2_HOST) $(CONFIG_USB_DWC2_DUAL_ROLE)),) diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h index 9deff0400a92..7161344c6522 100644 --- a/drivers/usb/dwc2/core.h +++ b/drivers/usb/dwc2/core.h @@ -860,6 +860,7 @@ struct dwc2_hregs_backup { * - USB_DR_MODE_PERIPHERAL * - USB_DR_MODE_HOST * - USB_DR_MODE_OTG + * @role_sw: usb_role_switch handle * @hcd_enabled: Host mode sub-driver initialization indicator. * @gadget_enabled: Peripheral mode sub-driver initialization indicator. * @ll_hw_enabled: Status of low-level hardware resources. @@ -1054,6 +1055,7 @@ struct dwc2_hsotg { struct dwc2_core_params params; enum usb_otg_state op_state; enum usb_dr_mode dr_mode; + struct usb_role_switch *role_sw; unsigned int hcd_enabled:1; unsigned int gadget_enabled:1; unsigned int ll_hw_enabled:1; @@ -1376,6 +1378,11 @@ static inline int dwc2_is_device_mode(struct dwc2_hsotg *hsotg) return (dwc2_readl(hsotg, GINTSTS) & GINTSTS_CURMODE_HOST) == 0; } +int dwc2_drd_init(struct dwc2_hsotg *hsotg); +void dwc2_drd_suspend(struct dwc2_hsotg *hsotg); +void dwc2_drd_resume(struct dwc2_hsotg *hsotg); +void dwc2_drd_exit(struct dwc2_hsotg *hsotg); + /* * Dump core registers and SPRAM */ @@ -1392,6 +1399,7 @@ int dwc2_hsotg_resume(struct dwc2_hsotg *dwc2); int dwc2_gadget_init(struct dwc2_hsotg *hsotg); void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2, bool reset); +void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg); void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg); void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2); int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode); @@ -1417,6 +1425,7 @@ static inline int dwc2_gadget_init(struct dwc2_hsotg *hsotg) { return 0; } static inline void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2, bool reset) {} +static inline void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) {} static inline void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg) {} static inline void dwc2_hsotg_disconnect(struct dwc2_hsotg *dwc2) {} static inline int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, diff --git a/drivers/usb/dwc2/drd.c b/drivers/usb/dwc2/drd.c new file mode 100644 index 000000000000..2d4176f5788e --- /dev/null +++ b/drivers/usb/dwc2/drd.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * drd.c - DesignWare USB2 DRD Controller Dual-role support + * + * Copyright (C) 2020 STMicroelectronics + * + * Author(s): Amelie Delaunay <amelie.delaunay@st.com> + */ + +#include <linux/iopoll.h> +#include <linux/platform_device.h> +#include <linux/usb/role.h> +#include "core.h" + +static void dwc2_ovr_init(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + u32 gotgctl; + + spin_lock_irqsave(&hsotg->lock, flags); + + gotgctl = dwc2_readl(hsotg, GOTGCTL); + gotgctl |= GOTGCTL_BVALOEN | GOTGCTL_AVALOEN | GOTGCTL_VBVALOEN; + gotgctl |= GOTGCTL_DBNCE_FLTR_BYPASS; + gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + dwc2_force_mode(hsotg, false); + + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +static int dwc2_ovr_avalid(struct dwc2_hsotg *hsotg, bool valid) +{ + u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); + + /* Check if A-Session is already in the right state */ + if ((valid && (gotgctl & GOTGCTL_ASESVLD)) || + (!valid && !(gotgctl & GOTGCTL_ASESVLD))) + return -EALREADY; + + if (valid) + gotgctl |= GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL; + else + gotgctl &= ~(GOTGCTL_AVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + return 0; +} + +static int dwc2_ovr_bvalid(struct dwc2_hsotg *hsotg, bool valid) +{ + u32 gotgctl = dwc2_readl(hsotg, GOTGCTL); + + /* Check if B-Session is already in the right state */ + if ((valid && (gotgctl & GOTGCTL_BSESVLD)) || + (!valid && !(gotgctl & GOTGCTL_BSESVLD))) + return -EALREADY; + + if (valid) + gotgctl |= GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL; + else + gotgctl &= ~(GOTGCTL_BVALOVAL | GOTGCTL_VBVALOVAL); + dwc2_writel(hsotg, gotgctl, GOTGCTL); + + return 0; +} + +static int dwc2_drd_role_sw_set(struct usb_role_switch *sw, enum usb_role role) +{ + struct dwc2_hsotg *hsotg = usb_role_switch_get_drvdata(sw); + unsigned long flags; + int already = 0; + + /* Skip session not in line with dr_mode */ + if ((role == USB_ROLE_DEVICE && hsotg->dr_mode == USB_DR_MODE_HOST) || + (role == USB_ROLE_HOST && hsotg->dr_mode == USB_DR_MODE_PERIPHERAL)) + return -EINVAL; + +#if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \ + IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE) + /* Skip session if core is in test mode */ + if (role == USB_ROLE_NONE && hsotg->test_mode) { + dev_dbg(hsotg->dev, "Core is in test mode\n"); + return -EBUSY; + } +#endif + + spin_lock_irqsave(&hsotg->lock, flags); + + if (role == USB_ROLE_HOST) { + already = dwc2_ovr_avalid(hsotg, true); + } else if (role == USB_ROLE_DEVICE) { + already = dwc2_ovr_bvalid(hsotg, true); + /* This clear DCTL.SFTDISCON bit */ + dwc2_hsotg_core_connect(hsotg); + } else { + if (dwc2_is_device_mode(hsotg)) { + if (!dwc2_ovr_bvalid(hsotg, false)) + /* This set DCTL.SFTDISCON bit */ + dwc2_hsotg_core_disconnect(hsotg); + } else { + dwc2_ovr_avalid(hsotg, false); + } + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + + if (!already && hsotg->dr_mode == USB_DR_MODE_OTG) + /* This will raise a Connector ID Status Change Interrupt */ + dwc2_force_mode(hsotg, role == USB_ROLE_HOST); + + dev_dbg(hsotg->dev, "%s-session valid\n", + role == USB_ROLE_NONE ? "No" : + role == USB_ROLE_HOST ? "A" : "B"); + + return 0; +} + +int dwc2_drd_init(struct dwc2_hsotg *hsotg) +{ + struct usb_role_switch_desc role_sw_desc = {0}; + struct usb_role_switch *role_sw; + int ret; + + if (!device_property_read_bool(hsotg->dev, "usb-role-switch")) + return 0; + + role_sw_desc.driver_data = hsotg; + role_sw_desc.fwnode = dev_fwnode(hsotg->dev); + role_sw_desc.set = dwc2_drd_role_sw_set; + role_sw_desc.allow_userspace_control = true; + + role_sw = usb_role_switch_register(hsotg->dev, &role_sw_desc); + if (IS_ERR(role_sw)) { + ret = PTR_ERR(role_sw); + dev_err(hsotg->dev, + "failed to register role switch: %d\n", ret); + return ret; + } + + hsotg->role_sw = role_sw; + + /* Enable override and initialize values */ + dwc2_ovr_init(hsotg); + + return 0; +} + +void dwc2_drd_suspend(struct dwc2_hsotg *hsotg) +{ + u32 gintsts, gintmsk; + + if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) { + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk &= ~GINTSTS_CONIDSTSCHNG; + dwc2_writel(hsotg, gintmsk, GINTMSK); + gintsts = dwc2_readl(hsotg, GINTSTS); + dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS); + } +} + +void dwc2_drd_resume(struct dwc2_hsotg *hsotg) +{ + u32 gintsts, gintmsk; + + if (hsotg->role_sw && !hsotg->params.external_id_pin_ctl) { + gintsts = dwc2_readl(hsotg, GINTSTS); + dwc2_writel(hsotg, gintsts | GINTSTS_CONIDSTSCHNG, GINTSTS); + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk |= GINTSTS_CONIDSTSCHNG; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } +} + +void dwc2_drd_exit(struct dwc2_hsotg *hsotg) +{ + if (hsotg->role_sw) + usb_role_switch_unregister(hsotg->role_sw); +} diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 5b9d23991c99..16c5f976f141 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3530,7 +3530,7 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg, dwc2_readl(hsotg, DOEPCTL0)); } -static void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) +void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) { /* set the soft-disconnect bit */ dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON); diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c index b28e90e0b685..238004050557 100644 --- a/drivers/usb/dwc2/platform.c +++ b/drivers/usb/dwc2/platform.c @@ -314,6 +314,8 @@ static int dwc2_driver_remove(struct platform_device *dev) if (hsotg->gadget_enabled) dwc2_hsotg_remove(hsotg); + dwc2_drd_exit(hsotg); + if (hsotg->params.activate_stm_id_vb_detection) regulator_disable(hsotg->usb33d); @@ -533,10 +535,17 @@ static int dwc2_driver_probe(struct platform_device *dev) dwc2_writel(hsotg, ggpio, GGPIO); } + retval = dwc2_drd_init(hsotg); + if (retval) { + if (retval != -EPROBE_DEFER) + dev_err(hsotg->dev, "failed to initialize dual-role\n"); + goto error_init; + } + if (hsotg->dr_mode != USB_DR_MODE_HOST) { retval = dwc2_gadget_init(hsotg); if (retval) - goto error_init; + goto error_drd; hsotg->gadget_enabled = 1; } @@ -562,7 +571,7 @@ static int dwc2_driver_probe(struct platform_device *dev) if (retval) { if (hsotg->gadget_enabled) dwc2_hsotg_remove(hsotg); - goto error_init; + goto error_drd; } hsotg->hcd_enabled = 1; } @@ -594,6 +603,9 @@ static int dwc2_driver_probe(struct platform_device *dev) dwc2_debugfs_exit(hsotg); if (hsotg->hcd_enabled) dwc2_hcd_remove(hsotg); +error_drd: + dwc2_drd_exit(hsotg); + error_init: if (hsotg->params.activate_stm_id_vb_detection) regulator_disable(hsotg->usb33d); @@ -612,6 +624,8 @@ static int __maybe_unused dwc2_suspend(struct device *dev) if (is_device_mode) dwc2_hsotg_suspend(dwc2); + dwc2_drd_suspend(dwc2); + if (dwc2->params.activate_stm_id_vb_detection) { unsigned long flags; u32 ggpio, gotgctl; @@ -692,6 +706,8 @@ static int __maybe_unused dwc2_resume(struct device *dev) /* Need to restore FORCEDEVMODE/FORCEHOSTMODE */ dwc2_force_dr_mode(dwc2); + dwc2_drd_resume(dwc2); + if (dwc2_is_device_mode(dwc2)) ret = dwc2_hsotg_resume(dwc2); -- 2.17.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support 2020-07-27 9:23 ` [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support Amelie Delaunay @ 2020-07-27 17:55 ` Martin Blumenstingl 0 siblings, 0 replies; 9+ messages in thread From: Martin Blumenstingl @ 2020-07-27 17:55 UTC (permalink / raw) To: Amelie Delaunay Cc: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue, linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier Hi Amelie, On Mon, Jul 27, 2020 at 11:23 AM Amelie Delaunay <amelie.delaunay@st.com> wrote: > > This patch adds support for usb role switch to dwc2, by using overriding > control of the PHY voltage valid and ID input signals. > > iddig signal (ID) can be overridden: > - when setting GUSBCFG_FORCEHOSTMODE, iddig input pin is overridden with 1; > - when setting GUSBCFG_FORCEDEVMODE, iddig input pin is overridden with 0. > > avalid/bvalid/vbusvalid signals can be overridden respectively with: > - GOTGCTL_AVALOEN + GOTGCTL_AVALOVAL > - GOTGCTL_BVALOEN + GOTGCTL_BVALOVAL > - GOTGCTL_VBVALEN + GOTGCTL_VBVALOVAL > > It is possible to determine valid sessions thanks to usb role switch: > - if USB_ROLE_NONE then !avalid && !bvalid && !vbusvalid > - if USB_ROLE_DEVICE then !avalid && bvalid && vbusvalid > - if USB_ROLE_HOST then avalid && !bvalid && vbusvalid > > Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> please add my: Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> The usb_role_switch part looks correct to me I don't understand the details of the dwc2 hardware well enough to say if the rest of this patch is fine or not (which is why I'm giving my Acked-by instead of Reviewed-by). Unfortunately I'm still fighting with the Amlogic bits (or my board...) to make this work on my boards. That why I can't give my Tested-by yet At the same time I'm confident that the problem lies within the Amlogic OTG detection/GPIOs so I don't see a reason to hold your patch up due to this Finally, please note that there may be a small conflict due to one bugfix I sent: [0] I think it will be trivial to solve (since we're both adding a new error label) Thank you for your good work again! Best regards, Martin [0] https://patchwork.kernel.org/patch/11687357/ ^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs 2020-07-27 9:23 [PATCH v4 0/3] Add USB role switch support to DWC2 Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support Amelie Delaunay @ 2020-07-27 9:23 ` Amelie Delaunay 2020-07-27 17:49 ` Martin Blumenstingl 2 siblings, 1 reply; 9+ messages in thread From: Amelie Delaunay @ 2020-07-27 9:23 UTC (permalink / raw) To: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue Cc: linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier, Amelie Delaunay, Martin Blumenstingl If usb-role-switch is present in the device tree, it means that ID and Vbus signals are not connected to the OTG controller but to an external component (GPIOs, Type-C controller). In this configuration, usb role switch is used to force valid sessions on STM32MP15 SoCs. Acked-by: Minas Harutyunyan <hminas@synopsys.com> Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> --- No changes in v4. --- drivers/usb/dwc2/params.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index a3611cdd1dea..65f8596f6795 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -183,9 +183,11 @@ static void dwc2_set_stm32mp15_fsotg_params(struct dwc2_hsotg *hsotg) static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg) { struct dwc2_core_params *p = &hsotg->params; + struct device_node *np = hsotg->dev->of_node; p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE; - p->activate_stm_id_vb_detection = true; + p->activate_stm_id_vb_detection = + !of_property_read_bool(np, "usb-role-switch"); p->host_rx_fifo_size = 440; p->host_nperio_tx_fifo_size = 256; p->host_perio_tx_fifo_size = 256; -- 2.17.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs 2020-07-27 9:23 ` [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs Amelie Delaunay @ 2020-07-27 17:49 ` Martin Blumenstingl 2020-07-27 19:44 ` Andy Shevchenko 0 siblings, 1 reply; 9+ messages in thread From: Martin Blumenstingl @ 2020-07-27 17:49 UTC (permalink / raw) To: Amelie Delaunay Cc: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue, linux-usb, devicetree, linux-kernel, linux-arm-kernel, linux-stm32, Fabrice Gasnier Hi Amelie, On Mon, Jul 27, 2020 at 11:23 AM Amelie Delaunay <amelie.delaunay@st.com> wrote: [...] > diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c > index a3611cdd1dea..65f8596f6795 100644 > --- a/drivers/usb/dwc2/params.c > +++ b/drivers/usb/dwc2/params.c > @@ -183,9 +183,11 @@ static void dwc2_set_stm32mp15_fsotg_params(struct dwc2_hsotg *hsotg) > static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg) > { > struct dwc2_core_params *p = &hsotg->params; > + struct device_node *np = hsotg->dev->of_node; > > p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE; > - p->activate_stm_id_vb_detection = true; > + p->activate_stm_id_vb_detection = > + !of_property_read_bool(np, "usb-role-switch"); the rest of params.c uses device_property_read_* instead of of_read_property_* I thought I'd mention it so you can decide yourself whether this is fine or needs to be changed Martin ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs 2020-07-27 17:49 ` Martin Blumenstingl @ 2020-07-27 19:44 ` Andy Shevchenko 2020-07-28 7:27 ` Amelie DELAUNAY 0 siblings, 1 reply; 9+ messages in thread From: Andy Shevchenko @ 2020-07-27 19:44 UTC (permalink / raw) To: Martin Blumenstingl Cc: Amelie Delaunay, Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre Torgue, USB, devicetree, Linux Kernel Mailing List, linux-arm Mailing List, linux-stm32, Fabrice Gasnier On Mon, Jul 27, 2020 at 10:04 PM Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote: > On Mon, Jul 27, 2020 at 11:23 AM Amelie Delaunay <amelie.delaunay@st.com> wrote: > > - p->activate_stm_id_vb_detection = true; > > + p->activate_stm_id_vb_detection = > > + !of_property_read_bool(np, "usb-role-switch"); > the rest of params.c uses device_property_read_* instead of of_read_property_* > I thought I'd mention it so you can decide yourself whether this is > fine or needs to be changed Better to change and leave all on one line. -- With Best Regards, Andy Shevchenko ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs 2020-07-27 19:44 ` Andy Shevchenko @ 2020-07-28 7:27 ` Amelie DELAUNAY 0 siblings, 0 replies; 9+ messages in thread From: Amelie DELAUNAY @ 2020-07-28 7:27 UTC (permalink / raw) To: Andy Shevchenko, Martin Blumenstingl Cc: Minas Harutyunyan, Felipe Balbi, Greg Kroah-Hartman, Rob Herring, Maxime Coquelin, Alexandre TORGUE, USB, devicetree, Linux Kernel Mailing List, linux-arm Mailing List, linux-stm32, Fabrice GASNIER Hi, On 7/27/20 9:44 PM, Andy Shevchenko wrote: > On Mon, Jul 27, 2020 at 10:04 PM Martin Blumenstingl > <martin.blumenstingl@googlemail.com> wrote: >> On Mon, Jul 27, 2020 at 11:23 AM Amelie Delaunay <amelie.delaunay@st.com> wrote: > >> > - p->activate_stm_id_vb_detection = true; >> > + p->activate_stm_id_vb_detection = >> > + !of_property_read_bool(np, "usb-role-switch"); >> the rest of params.c uses device_property_read_* instead of of_read_property_* >> I thought I'd mention it so you can decide yourself whether this is >> fine or needs to be changed > > Better to change and leave all on one line. > Thank you both for your review. I'll change it in upcoming v5. I'm still not used to exceed the 80 columns :) Regards, Amelie > -- > With Best Regards, > Andy Shevchenko ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2020-07-28 7:28 UTC | newest] Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-07-27 9:23 [PATCH v4 0/3] Add USB role switch support to DWC2 Amelie Delaunay 2020-07-27 9:23 ` [PATCH v4 1/3] dt-bindings: usb: dwc2: add optional usb-role-switch property Amelie Delaunay 2020-07-27 17:47 ` Martin Blumenstingl 2020-07-27 9:23 ` [PATCH v4 2/3] usb: dwc2: override PHY input signals with usb role switch support Amelie Delaunay 2020-07-27 17:55 ` Martin Blumenstingl 2020-07-27 9:23 ` [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs Amelie Delaunay 2020-07-27 17:49 ` Martin Blumenstingl 2020-07-27 19:44 ` Andy Shevchenko 2020-07-28 7:27 ` Amelie DELAUNAY
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