linux-kernel - Re: [usb-next PATCH] usb: xhci: skip phys initialization of shared hcd

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Message-ID: <ae71fdae-43aa-9df3-3f81-8a92460d61b9@ti.com>
Date:   Wed, 21 Mar 2018 11:05:15 +0200
From:   Roger Quadros <rogerq@...com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [usb-next PATCH] usb: xhci: skip phys initialization of shared
 hcd

Hi Chunfeng,

On 21/03/18 08:12, Chunfeng Yun wrote:
> The phys has already been initialized when add primary hcd,
> including usb2 phys and usb3 phys also if exist, so needn't
> re-parse "phys" property again.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
>  drivers/usb/host/xhci-mtk.c  | 1 +
>  drivers/usb/host/xhci-plat.c | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> index 7334da9..6bb23fb 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -554,6 +554,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
>  	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
>  		xhci->shared_hcd->can_do_streams = 1;
>  
> +	xhci->shared_hcd->skip_phy_initialization = 1;
>  	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
>  	if (ret)
>  		goto dealloc_usb2_hcd;
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 6700e5e..65a4294 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -294,6 +294,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
>  		xhci->shared_hcd->can_do_streams = 1;
>  
> +	xhci->shared_hcd->skip_phy_initialization = 1;

I think this is unnecessary.
There aren't separate PHYs for the primary and shared HCDs right?

Also how can you be sure that phy_init() has been done for all platform HCD users?

>  	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
>  	if (ret)
>  		goto dealloc_usb2_hcd;
> 

-- 
cheers,
-roger

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