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Message-ID: <20140724113941.GB26984@shlinux1.ap.freescale.net>
Date: Thu, 24 Jul 2014 19:39:42 +0800
From: Peter Chen <peter.chen@...escale.com>
To: Antoine Ténart
<antoine.tenart@...e-electrons.com>
CC: <balbi@...com>, <gregkh@...uxfoundation.org>, <kishon@...com>,
<stern@...land.harvard.edu>, <sergei.shtylyov@...entembedded.com>,
<yoshihiro.shimoda.uh@...esas.com>,
<alexandre.belloni@...e-electrons.com>,
<thomas.petazzoni@...e-electrons.com>, <zmxu@...vell.com>,
<jszhang@...vell.com>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 8/8] usb: chipidea: add support to the generic PHY
framework in ChipIdea
On Tue, Jul 15, 2014 at 04:39:16PM +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@...e-electrons.com>
> ---
> drivers/usb/chipidea/ci.h | 5 ++-
> drivers/usb/chipidea/core.c | 71 ++++++++++++++++++++++++++++++++++--------
> drivers/usb/chipidea/debug.c | 4 ++-
> drivers/usb/chipidea/host.c | 18 +++++++----
> drivers/usb/chipidea/otg_fsm.c | 6 ++--
> include/linux/usb/chipidea.h | 2 ++
> 6 files changed, 83 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index b2caa1772712..f219588f4ce6 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
> @@ -201,6 +202,8 @@ 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..28bcefcdbd9a 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);
If phy_init fails, we still need to call phy_exit?
> + return ret;
> + }
> + ret = phy_power_on(ci->phy);
If phy_power_on fails, we may need to call phy_exit
> + } 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 = of_phy_get(dev->of_node, 0);
Here, we may need to consider both usb_phy and generic_phy, and
the core device is not populated from device tree.
You can use devm_usb_get_phy and devm_phy_get for global phy case.
>
> - 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;
> + }
> }
>
> 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 d47cddd38e4a..77881a5ce48f 100644
> --- a/drivers/usb/chipidea/debug.c
> +++ b/drivers/usb/chipidea/debug.c
> @@ -219,7 +219,9 @@ 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",
> + usb_otg_state_string(ci->usb_phy->otg->state));
You may change wrongly here.
>
> /* ------ 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 0b67d78dd953..794349ab66af 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;
> @@ -85,13 +88,16 @@ static int host_start(struct ci_hdrc *ci)
> if (ret) {
> goto disable_reg;
> } else {
> - struct usb_otg *otg = ci->usb_phy->otg;
> + if (ci->usb_phy) {
> + struct usb_otg *otg = ci->usb_phy->otg;
>
> - ci->hcd = hcd;
> - if (otg) {
> - otg->host = &hcd->self;
> - hcd->self.otg_port = 1;
> + if (otg) {
> + otg->host = &hcd->self;
> + hcd->self.otg_port = 1;
> + }
> }
The otg port is still existed even use generic phy.
> +
> + ci->hcd = hcd;
> }
>
> if (ci->platdata->flags & CI_HDRC_DISABLE_STREAMING)
> diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
> index 8a64ce87364e..2c11f260633c 100644
> --- a/drivers/usb/chipidea/otg_fsm.c
> +++ b/drivers/usb/chipidea/otg_fsm.c
> @@ -788,10 +788,12 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
> return -ENOMEM;
> }
>
> - otg->usb_phy = ci->usb_phy;
> + if (ci->phy)
> + otg->phy = ci->phy;
> + else
> + otg->usb_phy = ci->usb_phy;
> otg->gadget = &ci->gadget;
> ci->fsm.otg = otg;
> - ci->usb_phy->otg = ci->fsm.otg;
Why you remove above line?
> ci->fsm.power_up = 1;
> ci->fsm.id = hw_read_otgsc(ci, OTGSC_ID) ? 1 : 0;
> ci->fsm.otg->state = OTG_STATE_UNDEFINED;
> 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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