linux-kernel - Re: [PATCH v12 3/9] usb: separate out sysdev pointer from usb

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Message-ID: <CAFp+6iGJxWqyingm0oszWCfyw1fkhCMFKHwe5uhRGpcYWX-XOA@mail.gmail.com>
Date:   Thu, 9 Feb 2017 11:50:32 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Peter Chen <peter.chen@....com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Ulf Hansson <ulf.hansson@...aro.org>, broonie@...nel.org,
        sre@...nel.org, "robh+dt" <robh+dt@...nel.org>,
        shawnguo@...nel.org, rjw@...ysocki.net,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Heiko Stübner <heiko@...ech.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, p.zabel@...gutronix.de,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, s.hauer@...gutronix.de,
        mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com,
        Fabio Estevam <festevam@...il.com>, oscar@...andei.net,
        Stephen Boyd <stephen.boyd@...aro.org>,
        linux-pm@...r.kernel.org,
        Joshua Clayton <stillcompiling@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        mka@...omium.org, Vaibhav Hiremath <vaibhav.hiremath@...aro.org>,
        Gary Bisson <gary.bisson@...ndarydevices.com>,
        Hans Verkuil <hverkuil@...all.nl>, krzk@...nel.org,
        Sriram Dash <sriram.dash@....com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Sinjan Kumar <sinjank@...eaurora.org>,
        David Fisher <david.fisher1@...opsys.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Thang Q. Nguyen" <tqnguyen@....com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ming Lei <tom.leiming@...il.com>, Jon Masters <jcm@...hat.com>,
        Dann Frazier <dann.frazier@...onical.com>,
        Leo Li <pku.leo@...il.com>
Subject: Re: [PATCH v12 3/9] usb: separate out sysdev pointer from usb_bus

Hi,

On Mon, Feb 6, 2017 at 2:43 PM, Peter Chen <peter.chen@....com> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> For xhci-hcd platform device, all the DMA parameters are not
> configured properly, notably dma ops for dwc3 devices.
>
> The idea here is that you pass in the parent of_node along with
> the child device pointer, so it would behave exactly like the
> parent already does. The difference is that it also handles all
> the other attributes besides the mask.
>
> sysdev will represent the physical device, as seen from firmware
> or bus.Splitting the usb_bus->controller field into the
> Linux-internal device (used for the sysfs hierarchy, for printks
> and for power management) and a new pointer (used for DMA,
> DT enumeration and phy lookup) probably covers all that we really
> need.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Sriram Dash <sriram.dash@....com>
> Tested-by: Baolin Wang <baolin.wang@...aro.org>
> Tested-by: Brian Norris <briannorris@...omium.org>
> Tested-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>
> Tested-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
> Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
> Cc: Grygorii Strashko <grygorii.strashko@...com>
> Cc: Sinjan Kumar <sinjank@...eaurora.org>
> Cc: David Fisher <david.fisher1@...opsys.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: "Thang Q. Nguyen" <tqnguyen@....com>
> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Ming Lei <tom.leiming@...il.com>
> Cc: Jon Masters <jcm@...hat.com>
> Cc: Dann Frazier <dann.frazier@...onical.com>
> Cc: Peter Chen <peter.chen@....com>
> Cc: Leo Li <pku.leo@...il.com>
> ---
>  drivers/usb/core/buffer.c | 12 ++++++------
>  drivers/usb/core/hcd.c    | 48 ++++++++++++++++++++++++++++-------------------
>  drivers/usb/core/usb.c    | 18 +++++++++---------
>  include/linux/usb.h       |  1 +
>  include/linux/usb/hcd.h   |  3 +++
>  5 files changed, 48 insertions(+), 34 deletions(-)

[snip]

> @@ -2511,8 +2512,8 @@ static void init_giveback_urb_bh(struct giveback_urb_bh *bh)
>   * Return: On success, a pointer to the created and initialized HCD structure.
>   * On failure (e.g. if memory is unavailable), %NULL.
>   */

sorry for the noise, but a minor nit here.
The comments section above explains usb_create_shared_hcd() method
and so should be moved down to its place.

> -struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
> -               struct device *dev, const char *bus_name,
> +struct usb_hcd *__usb_create_hcd(const struct hc_driver *driver,
> +               struct device *sysdev, struct device *dev, const char *bus_name,
>                 struct usb_hcd *primary_hcd)
>  {
>         struct usb_hcd *hcd;
> @@ -2553,8 +2554,9 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
>
>         usb_bus_init(&hcd->self);
>         hcd->self.controller = dev;
> +       hcd->self.sysdev = sysdev;
>         hcd->self.bus_name = bus_name;
> -       hcd->self.uses_dma = (dev->dma_mask != NULL);
> +       hcd->self.uses_dma = (sysdev->dma_mask != NULL);
>
>         init_timer(&hcd->rh_timer);
>         hcd->rh_timer.function = rh_timer_func;
> @@ -2569,6 +2571,14 @@ struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
>                         "USB Host Controller";
>         return hcd;
>  }
> +EXPORT_SYMBOL_GPL(__usb_create_hcd);
> +
> +struct usb_hcd *usb_create_shared_hcd(const struct hc_driver *driver,
> +               struct device *dev, const char *bus_name,
> +               struct usb_hcd *primary_hcd)
> +{
> +       return __usb_create_hcd(driver, dev, dev, bus_name, primary_hcd);
> +}
>  EXPORT_SYMBOL_GPL(usb_create_shared_hcd);


Regards
Vivek

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