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Date: Wed, 8 Jul 2015 08:08:27 +0000
From: Phil Edworthy <phil.edworthy@...esas.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Felipe Balbi <balbi@...com>,
Ulrich Hecht <ulrich.hecht@...il.com>,
Kishon Vijay Abraham I <kishon@...com>,
"Sergei Shtylyov" <sergei.shtylyov@...entembedded.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>
Subject: RE: [PATCH v5] usb: renesas_usbhs: Allow an OTG PHY driver to provide
VBUS
Hi Laurent,
On 08 July 2015 00:08, Laurent wrote:
> Hi Phil,
>
> Thank you for the patch.
>
> On Tuesday 07 July 2015 12:52:43 Phil Edworthy wrote:
> > These changes allow a PHY driver to trigger a VBUS interrupt and
> > to provide the value of VBUS.
> >
> > Signed-off-by: Phil Edworthy <phil.edworthy@...esas.com>
>
> This looks much better to me. I just have two comments, please see below.
>
> > ---
> > v5:
> > - Avoid race when vbus_is_indirect may or may not be read
> > before the phy has called vbus_session. In doing so, the
> > changes have also been isolated to mod_gadget.c
> >
> > v4:
> > - Use true/false with bool vars.
> > - Clean up "transceiver found" message.
> >
> > v3:
> > - Changed how indirect vbus is plumbed in.
> > - Removed unnecessary (void) on call to otg_set_peripheral.
> > - Moved code that connects to bus through transceiver so it
> > is before setting gpriv->driver.
> >
> > v2:
> > - vbus variables changed from int to bool.
> > - dev_info() changed to dev_err()
> > ---
> > drivers/usb/renesas_usbhs/mod_gadget.c | 62
> +++++++++++++++++++++++++++++++
> > 1 file changed, 62 insertions(+)
> >
> > diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c
> > b/drivers/usb/renesas_usbhs/mod_gadget.c index dc2aa32..19a22a3 100644
> > --- a/drivers/usb/renesas_usbhs/mod_gadget.c
> > +++ b/drivers/usb/renesas_usbhs/mod_gadget.c
> > @@ -21,6 +21,7 @@
> > #include <linux/platform_device.h>
> > #include <linux/usb/ch9.h>
> > #include <linux/usb/gadget.h>
> > +#include <linux/usb/otg.h>
> > #include "common.h"
> >
> > /*
> > @@ -50,6 +51,8 @@ struct usbhsg_gpriv {
> > int uep_size;
> >
> > struct usb_gadget_driver *driver;
> > + struct usb_phy *transceiver;
> > + bool vbus_indirect_value;
>
> How about naming this vbus_connected ? A boolean "value" doesn't mean much.
Hmm, vbus_connected isn't right either. This variable directly maps to the vbus
signal, i.e. this variable is true when the signal is high. I'll change it to
vbus_active.
> >
> > u32 status;
> > #define USBHSG_STATUS_STARTED (1 << 0)
> > @@ -873,6 +876,27 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32
> > status) }
> >
> > /*
> > + * VBUS provided by the PHY
> > + */
> > +static int usbhsm_phy_get_vbus(struct platform_device *pdev)
> > +{
> > + struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
> > + struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
> > +
> > + return gpriv->vbus_indirect_value;
> > +}
> > +
> > +static void usbhs_mod_phy_mode(struct usbhs_priv *priv)
> > +{
> > + struct usbhs_mod_info *info = &priv->mod_info;
> > +
> > + info->irq_vbus = NULL;
> > + priv->pfunc.get_vbus = usbhsm_phy_get_vbus;
> > +
> > + usbhs_irq_callback_update(priv, NULL);
> > +}
> > +
> > +/*
> > *
> > * linux usb function
> > *
> > @@ -882,12 +906,28 @@ static int usbhsg_gadget_start(struct usb_gadget
> > *gadget, {
> > struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
> > struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
> > + struct device *dev = usbhs_priv_to_dev(priv);
> > + int ret;
> >
> > if (!driver ||
> > !driver->setup ||
> > driver->max_speed < USB_SPEED_FULL)
> > return -EINVAL;
> >
> > + /* connect to bus through transceiver */
> > + if (!IS_ERR_OR_NULL(gpriv->transceiver)) {
> > + ret = otg_set_peripheral(gpriv->transceiver->otg,
> > + &gpriv->gadget);
> > + if (ret) {
> > + dev_err(dev, "%s: can't bind to transceiver\n",
> > + gpriv->gadget.name);
> > + return ret;
> > + }
> > +
> > + /* get vbus using phy versions */
> > + usbhs_mod_phy_mode(priv);
>
> Given that the presence of an external PHY is known at probe time, couldn't
> this call be moved to the probe function ? It would then probably conflict
> with the usbhs_mod_autonomy_mode() call from usbhs_probe(), which would
> need to be fixed.
You could do this, but as you say it would conflict with usbhs_probe(). I can't
see a simple way to check for the external phy connection, so I would prefer to
keep it here.
Is that ok?
> > + }
> > +
> > /* first hook up the driver ... */
> > gpriv->driver = driver;
> >
> > @@ -900,6 +940,10 @@ static int usbhsg_gadget_stop(struct usb_gadget
> > *gadget) struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
> >
> > usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
> > +
> > + if (!IS_ERR_OR_NULL(gpriv->transceiver))
> > + otg_set_peripheral(gpriv->transceiver->otg, NULL);
> > +
> > gpriv->driver = NULL;
> >
> > return 0;
> > @@ -947,12 +991,26 @@ static int usbhsg_set_selfpowered(struct usb_gadget
> > *gadget, int is_self) return 0;
> > }
> >
> > +static int usbhsg_vbus_session(struct usb_gadget *gadget, int is_active)
> > +{
> > + struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
> > + struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
> > + struct platform_device *pdev = usbhs_priv_to_pdev(priv);
> > +
> > + gpriv->vbus_indirect_value = !!is_active;
> > +
> > + renesas_usbhs_call_notify_hotplug(pdev);
> > +
> > + return 0;
> > +}
> > +
> > static const struct usb_gadget_ops usbhsg_gadget_ops = {
> > .get_frame = usbhsg_get_frame,
> > .set_selfpowered = usbhsg_set_selfpowered,
> > .udc_start = usbhsg_gadget_start,
> > .udc_stop = usbhsg_gadget_stop,
> > .pullup = usbhsg_pullup,
> > + .vbus_session = usbhsg_vbus_session,
> > };
> >
> > static int usbhsg_start(struct usbhs_priv *priv)
> > @@ -994,6 +1052,10 @@ int usbhs_mod_gadget_probe(struct usbhs_priv
> *priv)
> > goto usbhs_mod_gadget_probe_err_gpriv;
> > }
> >
> > + gpriv->transceiver = usb_get_phy(USB_PHY_TYPE_UNDEFINED);
> > + dev_info(dev, "%stransceiver found\n",
> > + gpriv->transceiver ? "" : "no ");
> > +
> > /*
> > * CAUTION
> > *
>
> --
> Regards,
>
> Laurent Pinchart
Thanks
Phil
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