linux-kernel - RE: [RFC PATCH] usb: host: xhci: plat: add support for otg_set

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Date:   Thu, 15 Dec 2016 12:10:18 +0000
From:   Manish Narani <manish.narani@...inx.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Anurag Kumar Vulisha" <anuragku@...inx.com>,
        Punnaiah Choudary Kalluri <punnaia@...inx.com>,
        Anirudha Sarangi <anirudh@...inx.com>
Subject: RE: [RFC PATCH] usb: host: xhci: plat: add support for
 otg_set_host() call

Thanks Greg. I have send another patch with changes as per your suggestions. Please review it and let me know if you have any concerns.

- Manish

-----Original Message-----
From: Greg KH [mailto:gregkh@...uxfoundation.org]
Sent: Thursday, December 15, 2016 2:29 AM
To: Manish Narani <MNARANI@...inx.com>
Cc: mathias.nyman@...el.com; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org; Anurag Kumar Vulisha <anuragku@...inx.com>; Punnaiah Choudary Kalluri <punnaia@...inx.com>; Anirudha Sarangi <anirudh@...inx.com>; Manish Narani <MNARANI@...inx.com>
Subject: Re: [RFC PATCH] usb: host: xhci: plat: add support for otg_set_host() call

On Thu, Dec 15, 2016 at 12:25:08AM +0530, Manish Narani wrote:
> This patch will add support for OTG host initialization. This will
> help OTG drivers to populate their host subsystem.
>
> Signed-off-by: Manish Narani <mnarani@...inx.com>
> ---
>  drivers/usb/host/xhci-plat.c |   35 +++++++++++++++++++++++++++++++++++
>  1 files changed, 35 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/host/xhci-plat.c
> b/drivers/usb/host/xhci-plat.c index ddfab30..b4cadbd 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -20,6 +20,10 @@
>  #include <linux/slab.h>
>  #include <linux/acpi.h>
>
> +#ifdef CONFIG_USB_OTG
> +#include <linux/usb/otg.h>
> +#endif

never use a #ifdef in a .c file if at all possible.  Here you don't need it at all.

> +
>  #include "xhci.h"
>  #include "xhci-plat.h"
>  #include "xhci-mvebu.h"
> @@ -255,6 +259,24 @@ static int xhci_plat_probe(struct platform_device *pdev)
>       if (ret)
>               goto dealloc_usb2_hcd;
>
> +#ifdef CONFIG_USB_OTG
> +     hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB3);
> +     if (!IS_ERR_OR_NULL(hcd->usb_phy) && hcd->usb_phy->otg) {
> +             dev_dbg(&pdev->dev, "%s otg support available\n", __func__);
> +             ret = otg_set_host(hcd->usb_phy->otg, &hcd->self);
> +             if (ret) {
> +                     dev_err(&pdev->dev, "%s otg_set_host failed\n",
> +                                     __func__);
> +                     usb_put_phy(hcd->usb_phy);
> +                     hcd->usb_phy = NULL;
> +                     goto dealloc_usb2_hcd;
> +             }
> +     } else {
> +             usb_put_phy(hcd->usb_phy);
> +             hcd->usb_phy = NULL;
> +     }
> +#endif

Can't you wrap this in a function to get rid of this #ifdef mess?

> +
>       return 0;
>
>
> @@ -283,6 +305,19 @@ static int xhci_plat_remove(struct platform_device *dev)
>       struct xhci_hcd *xhci = hcd_to_xhci(hcd);
>       struct clk *clk = xhci->clk;
>
> +#ifdef CONFIG_USB_OTG
> +     if (hcd->usb_phy) {
> +             if (!IS_ERR(hcd->usb_phy)) {
> +                     if (hcd->usb_phy->otg)
> +                             otg_set_host(hcd->usb_phy->otg, NULL);
> +                     usb_put_phy(hcd->usb_phy);
> +             }
> +             hcd->usb_phy = NULL;
> +             if (xhci->shared_hcd)
> +                     xhci->shared_hcd->usb_phy = NULL;
> +     }
> +#endif

same here.

thanks,

greg k-h


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