Re: [PATCH v3 9/9] usb: chipidea: add support to the generic PHY framework in ChipIdea

From: Peter Chen
Date: Tue Aug 26 2014 - 06:42:58 EST

On Fri, Aug 22, 2014 at 05:50:20PM +0200, Antoine Ténart wrote:
> This patch adds support of the PHY framework for ChipIdea drivers.
> Changes are done in both the ChipIdea common code and in the drivers
> accessing the PHY. This is done by adding a new PHY member in
> ChipIdea's structures and by taking care of it in the code.
>
> Signed-off-by: Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/chipidea/ci.h | 5 ++-
> drivers/usb/chipidea/core.c | 71 ++++++++++++++++++++++++++++++++++--------
> drivers/usb/chipidea/debug.c | 4 ++-
> drivers/usb/chipidea/host.c | 5 ++-
> drivers/usb/chipidea/otg_fsm.c | 6 +++-
> include/linux/usb/chipidea.h | 2 ++
> 6 files changed, 76 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index dac5ab6adfa2..7e9e8223672a 100644
> --- a/drivers/usb/chipidea/ci.h
> +++ b/drivers/usb/chipidea/ci.h
> @@ -161,7 +161,8 @@ struct hw_bank {
> * @test_mode: the selected test mode
> * @platdata: platform specific information supplied by parent device
> * @vbus_active: is VBUS active
> - * @usb_phy: pointer to USB PHY, if any
> + * @phy: pointer to PHY, if any
> + * @usb_phy: pointer to USB PHY, if any and if using the USB PHY framework
> * @hcd: pointer to usb_hcd for ehci host driver
> * @debugfs: root dentry for this controller in debugfs
> * @id_event: indicates there is an id event, and handled at ci_otg_work
> @@ -202,6 +203,8 @@ struct ci_hdrc {
>
> struct ci_hdrc_platform_data *platdata;
> int vbus_active;
> + struct phy *phy;
> + /* old usb_phy interface */
> struct usb_phy *usb_phy;
> struct usb_hcd *hcd;
> struct dentry *debugfs;
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index a8cd35fd8175..0041f5b5eafc 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/phy/phy.h>
> #include <linux/platform_device.h>
> #include <linux/module.h>
> #include <linux/idr.h>
> @@ -293,6 +294,46 @@ static void hw_phymode_configure(struct ci_hdrc *ci)
> }
>
> /**
> + * _ci_usb_phy_init: initialize phy taking in account both phy and usb_phy
> + * interfaces
> + * @ci: the controller
> + *
> + * This function returns an error code if the phy failed to init
> + */
> +static int _ci_usb_phy_init(struct ci_hdrc *ci)
> +{
> + int ret;
> +
> + if (ci->phy) {
> + ret = phy_init(ci->phy);
> + if (ret) {
> + phy_exit(ci->phy);
> + return ret;
> + }
> + ret = phy_power_on(ci->phy);

phy_exit is needed to call after phy_power_on failed

> + } else {
> + ret = usb_phy_init(ci->usb_phy);
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * _ci_usb_phy_exit: deinitialize phy taking in account both phy and usb_phy
> + * interfaces
> + * @ci: the controller
> + */
> +static void ci_usb_phy_exit(struct ci_hdrc *ci)
> +{
> + if (ci->phy) {
> + phy_power_off(ci->phy);
> + phy_exit(ci->phy);
> + } else {
> + usb_phy_shutdown(ci->usb_phy);
> + }
> +}
> +
> +/**
> * ci_usb_phy_init: initialize phy according to different phy type
> * @ci: the controller
> *
> @@ -306,7 +347,7 @@ static int ci_usb_phy_init(struct ci_hdrc *ci)
> case USBPHY_INTERFACE_MODE_UTMI:
> case USBPHY_INTERFACE_MODE_UTMIW:
> case USBPHY_INTERFACE_MODE_HSIC:
> - ret = usb_phy_init(ci->usb_phy);
> + ret = _ci_usb_phy_init(ci);
> if (ret)
> return ret;
> hw_phymode_configure(ci);
> @@ -314,12 +355,12 @@ static int ci_usb_phy_init(struct ci_hdrc *ci)
> case USBPHY_INTERFACE_MODE_ULPI:
> case USBPHY_INTERFACE_MODE_SERIAL:
> hw_phymode_configure(ci);
> - ret = usb_phy_init(ci->usb_phy);
> + ret = _ci_usb_phy_init(ci);
> if (ret)
> return ret;
> break;
> default:
> - ret = usb_phy_init(ci->usb_phy);
> + ret = _ci_usb_phy_init(ci);
> }
>
> return ret;
> @@ -595,23 +636,27 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - if (ci->platdata->usb_phy)
> + if (ci->platdata->phy)
> + ci->phy = ci->platdata->phy;
> + else if (ci->platdata->usb_phy)
> ci->usb_phy = ci->platdata->usb_phy;
> else
> - ci->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> + ci->phy = devm_phy_get(dev, "usb-phy");
>
> - if (IS_ERR(ci->usb_phy)) {
> - ret = PTR_ERR(ci->usb_phy);
> + if (IS_ERR(ci->phy)) {
> /*
> * if -ENXIO is returned, it means PHY layer wasn't
> * enabled, so it makes no sense to return -EPROBE_DEFER
> * in that case, since no PHY driver will ever probe.
> */
> - if (ret == -ENXIO)
> - return ret;
> + if (PTR_ERR(ci->phy) == -ENXIO)
> + return -ENXIO;
>
> - dev_err(dev, "no usb2 phy configured\n");
> - return -EPROBE_DEFER;
> + ci->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> + if (IS_ERR(ci->usb_phy)) {
> + dev_err(dev, "no usb2 phy configured\n");
> + return -EPROBE_DEFER;
> + }
> }

I am a little puzzled of your above change, if ci->phy == NULL, any chances
for devm_usb_get_phy(dev, USB_PHY_TYPE_USB2) is invoded?

>
> ret = ci_usb_phy_init(ci);
> @@ -718,7 +763,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> stop:
> ci_role_destroy(ci);
> deinit_phy:
> - usb_phy_shutdown(ci->usb_phy);
> + ci_usb_phy_exit(ci);
>
> return ret;
> }
> @@ -731,7 +776,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
> free_irq(ci->irq, ci);
> ci_role_destroy(ci);
> ci_hdrc_enter_lpm(ci, true);
> - usb_phy_shutdown(ci->usb_phy);
> + ci_usb_phy_exit(ci);
> kfree(ci->hw_bank.regmap);
>
> return 0;
> diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
> index 5a7ea93011dd..9e9da190a144 100644
> --- a/drivers/usb/chipidea/debug.c
> +++ b/drivers/usb/chipidea/debug.c
> @@ -219,7 +219,9 @@ static int ci_otg_show(struct seq_file *s, void *unused)
> fsm = &ci->fsm;
>
> /* ------ State ----- */
> - usb_otg_state_string(ci->usb_phy->otg.state));
> + if (ci->usb_phy)
> + seq_printf(s, "OTG state: %s\n\n",

Why above line is added? Did you delete wrongly before?

> + usb_otg_state_string(ci->usb_phy->otg->state));
>
> /* ------ State Machine Variables ----- */
> seq_printf(s, "a_bus_drop: %d\n", fsm->a_bus_drop);
> diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
> index 0952d4adfa4c..0465578bf805 100644
> --- a/drivers/usb/chipidea/host.c
> +++ b/drivers/usb/chipidea/host.c
> @@ -59,7 +59,10 @@ static int host_start(struct ci_hdrc *ci)
> hcd->has_tt = 1;
>
> hcd->power_budget = ci->platdata->power_budget;
> - hcd->usb_phy = ci->usb_phy;
> + if (ci->phy)
> + hcd->phy = ci->phy;
> + else
> + hcd->usb_phy = ci->usb_phy;
>
> ehci = hcd_to_ehci(hcd);
> ehci->caps = ci->hw_bank.cap;
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 7eb86863fb3c..164cd2fff39b 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -779,7 +779,11 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
> {
> int retval = 0;
>
> - ci->otg.usb_phy = ci->usb_phy;
> + if (ci->phy)
> + ci->otg.phy = ci->phy;
> + else
> + ci->otg.usb_phy = ci->usb_phy;
> +
> ci->fsm.otg = &ci->otg;
> ci->fsm.power_up = 1;
> ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
> diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
> index 57d757a1aa83..a0285623b9c1 100644
> --- a/include/linux/usb/chipidea.h
> +++ b/include/linux/usb/chipidea.h
> @@ -13,6 +13,8 @@ struct ci_hdrc_platform_data {
> /* offset of the capability registers */
> uintptr_t capoffset;
> unsigned power_budget;
> + struct phy *phy;
> + /* old usb_phy interface */
> struct usb_phy *usb_phy;
> enum usb_phy_interface phy_mode;
> unsigned long flags;
> --
> 1.9.1
>

--
Best Regards,
Peter Chen
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