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Date: Wed, 11 May 2016 16:43:01 +0800
From: Peter Chen <hzpeterchen@...il.com>
To: Roger Quadros <rogerq@...com>
Cc: peter.chen@...escale.com, stern@...land.harvard.edu,
balbi@...nel.org, gregkh@...uxfoundation.org,
dan.j.williams@...el.com, jun.li@...escale.com,
mathias.nyman@...ux.intel.com, tony@...mide.com,
Joao.Pinto@...opsys.com, abrestic@...omium.org,
yoshihiro.shimoda.uh@...esas.com, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v7 10/14] usb: otg: add hcd companion support
On Mon, May 02, 2016 at 03:18:53PM +0300, Roger Quadros wrote:
> From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
>
> Since some host controller (e.g. EHCI) needs a companion host controller
> (e.g. OHCI), this patch adds such a configuration to use it in the OTG
> core.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Signed-off-by: Roger Quadros <rogerq@...com>
Acked-by: Peter Chen <peter.chen@....com>
> ---
> Documentation/devicetree/bindings/usb/generic.txt | 3 +++
> drivers/usb/common/usb-otg.c | 32 ++++++++++++++++-------
> include/linux/usb/otg.h | 7 ++++-
> 3 files changed, 32 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
> index f6866c1..1db1c33 100644
> --- a/Documentation/devicetree/bindings/usb/generic.txt
> +++ b/Documentation/devicetree/bindings/usb/generic.txt
> @@ -27,6 +27,9 @@ Optional properties:
> - otg-controller: phandle to otg controller. Host or gadget controllers can
> contain this property to link it to a particular OTG
> controller.
> + - hcd-needs-companion: must be present if otg controller is dealing with
> + EHCI host controller that needs a companion OHCI host
> + controller.
>
> This is an attribute to a USB controller such as:
>
> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c
> index 702bca8..77048aa 100644
> --- a/drivers/usb/common/usb-otg.c
> +++ b/drivers/usb/common/usb-otg.c
> @@ -20,6 +20,7 @@
> #include <linux/list.h>
> #include <linux/of.h>
> #include <linux/of_platform.h>
> +#include <linux/usb/of.h>
> #include <linux/usb/otg.h>
> #include <linux/usb/gadget.h>
> #include <linux/workqueue.h>
> @@ -582,6 +583,10 @@ struct usb_otg *usb_otg_register(struct device *dev,
> else
> INIT_WORK(&otg->work, usb_drd_work);
>
> + if (of_find_property(dev->of_node, "hcd-needs-companion", NULL) ||
> + config->hcd_needs_companion) /* needs companion ? */
> + otg->flags |= OTG_FLAG_HCD_NEEDS_COMPANION;
> +
> otg->wq = create_singlethread_workqueue("usb_otg");
> if (!otg->wq) {
> dev_err(dev, "otg: %s: can't create workqueue\n",
> @@ -805,15 +810,18 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> /* HCD will be started by OTG fsm when needed */
> mutex_lock(&otg->fsm.lock);
> if (otg->primary_hcd.hcd) {
> - /* probably a shared HCD ? */
> - if (usb_otg_hcd_is_primary_hcd(hcd)) {
> + /* probably a shared HCD or a companion OHCI HCD ? */
> + if (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
> + usb_otg_hcd_is_primary_hcd(hcd)) {
> dev_err(otg_dev, "otg: primary host already registered\n");
> goto err;
> }
>
> - if (hcd->shared_hcd == otg->primary_hcd.hcd) {
> + if (otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION ||
> + (hcd->shared_hcd == otg->primary_hcd.hcd)) {
> if (otg->shared_hcd.hcd) {
> - dev_err(otg_dev, "otg: shared host already registered\n");
> + dev_err(otg_dev,
> + "otg: shared/companion host already registered\n");
> goto err;
> }
>
> @@ -821,10 +829,12 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> otg->shared_hcd.irqnum = irqnum;
> otg->shared_hcd.irqflags = irqflags;
> otg->shared_hcd.ops = ops;
> - dev_info(otg_dev, "otg: shared host %s registered\n",
> + dev_info(otg_dev,
> + "otg: shared/companion host %s registered\n",
> dev_name(hcd->self.controller));
> } else {
> - dev_err(otg_dev, "otg: invalid shared host %s\n",
> + dev_err(otg_dev,
> + "otg: invalid shared/companion host %s\n",
> dev_name(hcd->self.controller));
> goto err;
> }
> @@ -847,14 +857,17 @@ int usb_otg_register_hcd(struct usb_hcd *hcd, unsigned int irqnum,
> * we're ready only if we have shared HCD
> * or we don't need shared HCD.
> */
> - if (otg->shared_hcd.hcd || !otg->primary_hcd.hcd->shared_hcd) {
> + if (otg->shared_hcd.hcd ||
> + (!(otg->flags & OTG_FLAG_HCD_NEEDS_COMPANION) &&
> + !otg->primary_hcd.hcd->shared_hcd)) {
> otg->host = hcd_to_bus(hcd);
> /* FIXME: set bus->otg_port if this is true OTG port with HNP */
>
> /* start FSM */
> usb_otg_start_fsm(otg);
> } else {
> - dev_dbg(otg_dev, "otg: can't start till shared host registers\n");
> + dev_dbg(otg_dev,
> + "otg: can't start till shared/companion host registers\n");
> }
>
> mutex_unlock(&otg->fsm.lock);
> @@ -905,7 +918,8 @@ int usb_otg_unregister_hcd(struct usb_hcd *hcd)
> dev_name(hcd_dev));
> } else if (hcd == otg->shared_hcd.hcd) {
> otg->shared_hcd.hcd = NULL;
> - dev_info(otg_dev, "otg: shared host %s unregistered\n",
> + dev_info(otg_dev,
> + "otg: shared/companion host %s unregistered\n",
> dev_name(hcd_dev));
> } else {
> dev_err(otg_dev, "otg: host %s wasn't registered with otg\n",
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index b094352..6f4ca77 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -57,7 +57,8 @@ struct otg_hcd {
> * @list: list of otg controllers
> * @work: otg state machine work
> * @wq: otg state machine work queue
> - * @flags: to track if host/gadget is running
> + * @flags: to track if host/gadget is running, or to indicate if hcd needs
> + * companion
> */
> struct usb_otg {
> u8 default_a;
> @@ -84,6 +85,7 @@ struct usb_otg {
> u32 flags;
> #define OTG_FLAG_GADGET_RUNNING (1 << 0)
> #define OTG_FLAG_HOST_RUNNING (1 << 1)
> +#define OTG_FLAG_HCD_NEEDS_COMPANION (1 << 2)
> /* use otg->fsm.lock for serializing access */
>
> /*------------- deprecated interface -----------------------------*/
> @@ -125,11 +127,14 @@ struct usb_otg_caps {
> * @caps: otg capabilities of the controller
> * @ops: otg fsm operations
> * @otg_work: optional custom otg state machine work function
> + * @hcd_needs_companion: Indicates if host controller needs a companion
> + * controller
> */
> struct usb_otg_config {
> struct usb_otg_caps *otg_caps;
> struct otg_fsm_ops *fsm_ops;
> void (*otg_work)(struct work_struct *work);
> + bool hcd_needs_companion;
> };
>
> extern const char *usb_otg_state_string(enum usb_otg_state state);
> --
> 2.7.4
>
> --
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--
Best Regards,
Peter Chen
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