linux-kernel - Re: [PATCH v2 2/4] usb: xhci: xhci-plat: Add support for Broadcom STB SoC's

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Message-ID: <0841dbde-efa7-6dc2-c19d-f87b756a94eb@linux.intel.com>
Date:   Tue, 31 Mar 2020 12:37:35 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Al Cooper <alcooperx@...il.com>, linux-kernel@...r.kernel.org
Cc:     andriy.shevchenko@...ux.intel.com,
        Alan Stern <stern@...land.harvard.edu>,
        bcm-kernel-feedback-list@...adcom.com,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-usb@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/4] usb: xhci: xhci-plat: Add support for Broadcom STB
 SoC's

On 27.3.2020 22.47, Al Cooper wrote:
> Add support for Broadcom STB SoC's to the xhci platform driver
> 
> Signed-off-by: Al Cooper <alcooperx@...il.com>
> ---
>  drivers/usb/host/xhci-brcm.c | 16 ++++++++++++++++
>  drivers/usb/host/xhci-brcm.h | 16 ++++++++++++++++
>  drivers/usb/host/xhci-plat.c | 11 +++++++++++
>  3 files changed, 43 insertions(+)
>  create mode 100644 drivers/usb/host/xhci-brcm.c
>  create mode 100644 drivers/usb/host/xhci-brcm.h
> 
> diff --git a/drivers/usb/host/xhci-brcm.c b/drivers/usb/host/xhci-brcm.c
> new file mode 100644
> index 000000000000..bf8c0bfd1780
> --- /dev/null
> +++ b/drivers/usb/host/xhci-brcm.c
> @@ -0,0 +1,16 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2018, Broadcom */
> +
> +#include <linux/usb.h>
> +#include <linux/usb/hcd.h>
> +
> +#include "xhci.h"
> +
> +int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd)
> +{
> +	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
> +
> +	xhci->quirks |= XHCI_RESET_ON_RESUME;
> +	return 0;
> +}
> +

If there's nothing else than one quirk flag needed for Broadcom STB Soc
it would be simpler to add it directly to the xhci_plat_brcm structure.

No need to add xhci-brcm.c or xhci-brcm.h files, or any xhci Makfile or Kconfig
changes


> diff --git a/drivers/usb/host/xhci-brcm.h b/drivers/usb/host/xhci-brcm.h
> new file mode 100644
> index 000000000000..e64800fae4d5
> --- /dev/null
> +++ b/drivers/usb/host/xhci-brcm.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2018, Broadcom */
> +
> +#ifndef _XHCI_BRCM_H
> +#define _XHCI_BRCM_H
> +
> +#if IS_ENABLED(CONFIG_USB_XHCI_BRCM)
> +int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd);
> +#else
> +static inline int xhci_plat_brcm_init_quirk(struct usb_hcd *hcd)
> +{
> +	return 0;
> +}
> +#endif
> +#endif /* _XHCI_BRCM_H */
> +
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 315b4552693c..3e90a1207803 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -22,6 +22,7 @@
>  
>  #include "xhci.h"
>  #include "xhci-plat.h"
> +#include "xhci-brcm.h"
>  #include "xhci-mvebu.h"
>  #include "xhci-rcar.h"
>  
> @@ -112,6 +113,10 @@ static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
>  	SET_XHCI_PLAT_PRIV_FOR_RCAR(XHCI_RCAR_FIRMWARE_NAME_V3)
>  };
>  
> +static const struct xhci_plat_priv xhci_plat_brcm = {
> +	.init_quirk = xhci_plat_brcm_init_quirk,
> +};
> +

So something like this instead:

static const struct xhci_plat_priv xhci_plat_brcm = {
	.quirks = XHCI_RESET_ON_RESUME,
};

-Mathias