Re: [PATCH v3] usb: chipidea: Use extcon framework for VBUS and ID detect

From: Ivan T. Ivanov
Date: Fri Jun 05 2015 - 03:37:35 EST

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In reply to: Peter Chen: "Re: [PATCH v3] usb: chipidea: Use extcon framework for VBUS and ID detect"
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On Fri, 2015-06-05 at 15:03 +0800, Peter Chen wrote:
> On Tue, Jun 02, 2015 at 04:14:33PM +0300, Ivan T. Ivanov wrote:
> > On recent Qualcomm platforms VBUS and ID lines are not routed to
> > USB PHY LINK controller. Use extcon framework to receive connect
> > and disconnect ID and VBUS notification.
> >
> > Signed-off-by: Ivan T. Ivanov ivanov@xxxxxxxxxx>
> > ---
> > Changes sice v2 [1].
> >
> > * Simulate IRQ on extcon event - used to trigger OTG state machine.
> >
>
> No, you may not need to trigger complicate OTG FSM, instead, the
> role switch based on ID value is ok.

I have tried this also, but I decided that using IRQ simulation
will handle all use cases.

>
> > I have to admit that I couldn't test complete Chipidea OTG state machine,
> > because my setup is little weird. I am using "qcom,usb-otg-ci" as PHY/OTG
> > provider, "qcom,ehci-host" as host controller driver and "qcom,ci-hdrc" for
> > device role.
> >
>
> Then, I am puzzled what kinds of flow you have tested in this patch?
> extcon is really needed for chipidea core, but I hope we have tested
> patch set based on it. Rob Herring have tested Marvell's host controller
> can also use chipidea host driver, I think the same for qualcomm's.
> The otg flow at phy-msm-usb.c can be removed and use chipidea's instead, and
> only remain phy part at it.

I have tried this, but there is too many legacy code which is supposed to
handle old platforms and I can not distinguish, which should stay in and
what could be taken out. I will take a look again.

>
> Current role switch and vbus flow are based on otgsc register, you can
> improve it by adding extcon support.

I am not sure that I get this. Isn't exactly what this patch does?

Regards,
Ivan

>
> Peter
>
> > There could be patch conflict regarding ci-hdrc-qcom.txt, because Rob Herring
> > is consolidating DT binding for all vendors which integrate this device [2]
> >
> > [1] https://lkml.org/lkml/2015/4/15/283
> > [2] http://www.spinics.net/lists/linux-usb/msg125453.html
> >
> > .../devicetree/bindings/usb/ci-hdrc-qcom.txt | 9 ++
> > drivers/usb/chipidea/Kconfig | 1 +
> > drivers/usb/chipidea/core.c | 125 +++++++++++++++++++++
> > drivers/usb/chipidea/otg.c | 55 ++++++++-
> > include/linux/usb/chipidea.h | 24 ++++
> > 5 files changed, 212 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt
> > index f2899b5..c635aca 100644
> > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt
> > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-qcom.txt
> > @@ -7,6 +7,14 @@ Required properties:
> > - usb-phy: phandle for the PHY device
> > - dr_mode: Should be "peripheral"
> >
> > +Optional properties:
> > +- extcon: phandles to external connector devices. First phandle
> > + should point to external connector, which provide "USB"
> > + cable events, the second should point to external connector
> > + device, which provide "USB-HOST" cable events. If one of
> > + the external connector devices is not required, empty <0>
> > + phandle should be specified.
> > +
> > Examples:
> > ÂÂÂÂÂÂÂgadget@f9a55000 {
> > compatible = "qcom,ci-hdrc";
> > @@ -14,4 +22,5 @@ Examples:
> > dr_mode = "peripheral";
> > interrupts = <0 134 0>;
> > usb-phy = <&usbphy0>;
> > + extcon = <0>, <&usb_id>;
> > };
> > diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> > index 5ce3f1d..5619b8c 100644
> > --- a/drivers/usb/chipidea/Kconfig
> > +++ b/drivers/usb/chipidea/Kconfig
> > @@ -1,6 +1,7 @@
> > config USB_CHIPIDEA
> > tristate "ChipIdea Highspeed Dual Role Controller"
> > depends on ((USB_EHCI_HCD && USB_GADGET) || (USB_EHCI_HCD && !USB_GADGET) || (!USB_EHCI_HCD && USB_GADGET)) && HAS_DMA
> > + select EXTCON
> > help
> > Say Y here if your system has a dual role high speed USB
> > controller based on ChipIdea silicon IP. Currently, only the
> > diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> > index 74fea4f..2ae2c09 100644
> > --- a/drivers/usb/chipidea/core.c
> > +++ b/drivers/usb/chipidea/core.c
> > @@ -47,6 +47,7 @@
> > #include <linux/delay.h>
> > #include <linux/device.h>
> > #include <linux/dma-mapping.h>
> > +#include <linux/extcon.h>
> > #include <linux/phy/phy.h>
> > #include <linux/platform_device.h>
> > #include <linux/module.h>
> > @@ -557,9 +558,47 @@ static irqreturn_t ci_irq(int irq, void *data)
> > return ret;
> > }
> >
> > +static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event,
> > + void *ptr)
> > +{
> > + struct ci_hdrc_cable *vbus = container_of(nb, struct ci_hdrc_cable, nb);
> > + struct ci_hdrc *ci = vbus->ci;
> > +
> > + if (event)
> > + vbus->state = true;
> > + else
> > + vbus->state = false;
> > +
> > + vbus->changed = true;
> > +
> > + ci_irq(ci->irq, ci);
> > + return NOTIFY_DONE;
> > +}
> > +
> > +static int ci_id_notifier(struct notifier_block *nb, unsigned long event,
> > + void *ptr)
> > +{
> > + struct ci_hdrc_cable *id = container_of(nb, struct ci_hdrc_cable, nb);
> > + struct ci_hdrc *ci = id->ci;
> > +
> > + if (event)
> > + id->state = false;
> > + else
> > + id->state = true;
> > +
> > + id->changed = true;
> > +
> > + ci_irq(ci->irq, ci);
> > + return NOTIFY_DONE;
> > +}
> > +
> > static int ci_get_platdata(struct device *dev,
> > struct ci_hdrc_platform_data *platdata)
> > {
> > + struct extcon_dev *ext_vbus, *ext_id;
> > + struct ci_hdrc_cable *cable;
> > + int ret;
> > +
> > if (!platdata->phy_mode)
> > platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
> >
> > @@ -591,9 +630,89 @@ static int ci_get_platdata(struct device *dev,
> > if (of_usb_get_maximum_speed(dev->of_node) == USB_SPEED_FULL)
> > platdata->flags |= CI_HDRC_FORCE_FULLSPEED;
> >
> > + ext_id = ERR_PTR(-ENODEV);
> > + ext_vbus = ERR_PTR(-ENODEV);
> > + if (of_property_read_bool(dev->of_node, "extcon")) {
> > + /* Each one of them is not mandatory */
> > + ext_vbus = extcon_get_edev_by_phandle(dev, 0);
> > + if (IS_ERR(ext_vbus) && PTR_ERR(ext_vbus) != -ENODEV)
> > + return PTR_ERR(ext_vbus);
> > +
> > + ext_id = extcon_get_edev_by_phandle(dev, 1);
> > + if (IS_ERR(ext_id) && PTR_ERR(ext_id) != -ENODEV)
> > + return PTR_ERR(ext_id);
> > + }
> > +
> > + cable = &platdata->vbus_extcon;
> > + cable->nb.notifier_call = ci_vbus_notifier;
> > + cable->edev = ext_vbus;
> > +
> > + if (!IS_ERR(ext_vbus)) {
> > + ret = extcon_get_cable_state(cable->edev, "USB");
> > + if (ret)
> > + cable->state = true;
> > + else
> > + cable->state = false;
> > + }
> > +
> > + cable = &platdata->id_extcon;
> > + cable->nb.notifier_call = ci_id_notifier;
> > + cable->edev = ext_id;
> > +
> > + if (!IS_ERR(ext_id)) {
> > + ret = extcon_get_cable_state(cable->edev, "USB-HOST");
> > + if (ret)
> > + cable->state = false;
> > + else
> > + cable->state = true;
> > + }
> > + return 0;
> > +}
> > +
> > +static int ci_extcon_register(struct ci_hdrc *ci)
> > +{
> > + struct ci_hdrc_cable *id, *vbus;
> > + int ret;
> > +
> > + id = &ci->platdata->id_extcon;
> > + id->ci = ci;
> > + if (!IS_ERR(id->edev)) {
> > + ret = extcon_register_interest(&id->conn, id->edev->name,
> > + "USB-HOST", &id->nb);
> > + if (ret < 0) {
> > + dev_err(ci->dev, "register ID failed\n");
> > + return ret;
> > + }
> > + }
> > +
> > + vbus = &ci->platdata->vbus_extcon;
> > + vbus->ci = ci;
> > + if (!IS_ERR(vbus->edev)) {
> > + ret = extcon_register_interest(&vbus->conn, vbus->edev->name,
> > + "USB", &vbus->nb);
> > + if (ret < 0) {
> > + extcon_unregister_interest(&id->conn);
> > + dev_err(ci->dev, "register VBUS failed\n");
> > + return ret;
> > + }
> > + }
> > +
> > return 0;
> > }
> >
> > +static void ci_extcon_unregister(struct ci_hdrc *ci)
> > +{
> > + struct ci_hdrc_cable *cable;
> > +
> > + cable = &ci->platdata->id_extcon;
> > + if (!IS_ERR(cable->edev))
> > + extcon_unregister_interest(&cable->conn);
> > +
> > + cable = &ci->platdata->vbus_extcon;
> > + if (!IS_ERR(cable->edev))
> > + extcon_unregister_interest(&cable->conn);
> > +}
> > +
> > static DEFINE_IDA(ci_ida);
> >
> > struct platform_device *ci_hdrc_add_device(struct device *dev,
> > @@ -817,6 +936,10 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> > if (ret)
> > goto stop;
> >
> > + ret = ci_extcon_register(ci);
> > + if (ret)
> > + goto stop;
> > +
> > if (ci->supports_runtime_pm) {
> > pm_runtime_set_active(&pdev->dev);
> > pm_runtime_enable(&pdev->dev);
> > @@ -834,6 +957,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> > if (!ret)
> > return 0;
> >
> > + ci_extcon_unregister(ci);
> > stop:
> > ci_role_destroy(ci);
> > deinit_phy:
> > @@ -853,6 +977,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
> > }
> >
> > dbg_remove_files(ci);
> > + ci_extcon_unregister(ci);
> > ci_role_destroy(ci);
> > ci_hdrc_enter_lpm(ci, true);
> > ci_usb_phy_exit(ci);
> > diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> > index ad6c87a..77fe2df 100644
> > --- a/drivers/usb/chipidea/otg.c
> > +++ b/drivers/usb/chipidea/otg.c
> > @@ -30,7 +30,41 @@
> > */
> > u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
> > {
> > - return hw_read(ci, OP_OTGSC, mask);
> > + struct ci_hdrc_cable *cable;
> > + u32 val = hw_read(ci, OP_OTGSC, mask);
> > +
> > + /*
> > + * If using extcon framework for VBUS and/or ID signal
> > + * detection overwrite OTGSC resiter value
> > + */
> > + cable = &ci->platdata->vbus_extcon;
> > + if (!IS_ERR(cable->edev)) {
> > + if (cable->changed)
> > + val |= OTGSC_BSVIS;
> > + else
> > + val &= ~OTGSC_BSVIS;
> > +
> > + if (cable->state)
> > + val |= OTGSC_BSV;
> > + else
> > + val &= ~OTGSC_BSV;
> > + }
> > +
> > + cable = &ci->platdata->id_extcon;
> > + if (!IS_ERR(cable->edev)) {
> > + if (cable->changed)
> > + val |= OTGSC_IDIS;
> > + else
> > + val &= ~OTGSC_IDIS;
> > +
> > + if (cable->state)
> > + val |= OTGSC_ID;
> > + else
> > + val &= ~OTGSC_ID;
> > + }
> > +
> > + val &= mask;
> > + return val;
> > }
> >
> > /**
> > @@ -40,7 +74,24 @@ u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
> > */
> > void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
> > {
> > - hw_write(ci, OP_OTGSC, mask | OTGSC_INT_STATUS_BITS, data);
> > + struct ci_hdrc_cable *cable;
> > +
> > + mask |= OTGSC_INT_STATUS_BITS;
> > +
> > + /* clear artificial bits */
> > + cable = &ci->platdata->vbus_extcon;
> > + if (!IS_ERR(cable->edev)) {
> > + if (data & OTGSC_BSVIS)
> > + cable->changed = false;
> > + }
> > +
> > + cable = &ci->platdata->id_extcon;
> > + if (!IS_ERR(cable->edev)) {
> > + if (data & OTGSC_IDIS)
> > + cable->changed = false;
> > + }
> > +
> > + hw_write(ci, OP_OTGSC, mask, data);
> > }
> >
> > /**
> > diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> > index ab94f78..05915cb1 100644
> > --- a/include/linux/usb/chipidea.h
> > +++ b/include/linux/usb/chipidea.h
> > @@ -5,9 +5,29 @@
> > #ifndef __LINUX_USB_CHIPIDEA_H
> > #define __LINUX_USB_CHIPIDEA_H
> >
> > +#include <linux/extcon.h>
> > #include <linux/usb/otg.h>
> >
> > struct ci_hdrc;
> > +
> > +/**
> > + * struct ci_hdrc_cable - structure for external connector cable state tracking
> > + * @state: current state of the line
> > + * @changed: set to true when extcon event happen
> > + * @edev: device which generate events
> > + * @ci: driver state of the chipidea device
> > + * @nb: hold event notification callback
> > + * @conn: used for notification registration
> > + */
> > +struct ci_hdrc_cable {
> > + bool state;
> > + bool changed;
> > + struct extcon_dev*edev;
> > + struct ci_hdrc*ci;
> > + struct notifier_blocknb;
> > + struct extcon_specific_cable_nb conn;
> > +};
> > +
> > struct ci_hdrc_platform_data {
> > const char*name;
> > /* offset of the capability registers */
> > @@ -35,6 +55,10 @@ struct ci_hdrc_platform_data {
> > void (*notify_event) (struct ci_hdrc *ci, unsigned event);
> > struct regulator*reg_vbus;
> > bool tpl_support;
> > +
> > + /* VBUS and ID signal state tracking, using extcon framework */
> > + struct ci_hdrc_cablevbus_extcon;
> > + struct ci_hdrc_cableid_extcon;
> > };
> >
> > /* Default offset of capability registers */
> > --
> > 1.9.1
> >
>
>
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In reply to: Peter Chen: "Re: [PATCH v3] usb: chipidea: Use extcon framework for VBUS and ID detect"
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