linux-kernel - Re: [PATCH 2/2] usb: xhci-mtk: Do not create shared

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Date:   Tue, 7 May 2019 15:37:24 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Khuong Dinh <khuong@...amperecomputing.com>,
        Hoan Tran <hoan@...amperecomputing.com>
Subject: Re: [PATCH 2/2] usb: xhci-mtk: Do not create shared_hcd if no USB
 3.0 port available

Hi Nicolas,
On Thu, 2019-05-02 at 12:56 +0800, Nicolas Boichat wrote:
> When the controller only supports USB 2.0, do not even create the
> USB 3.0 hcd/root hub.
> 
> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
> ---
>  drivers/usb/host/xhci-mtk.c | 44 +++++++++++++++++++++++--------------
>  1 file changed, 28 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> index 026fe18972d3e5b..189f5dc614e6e05 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -527,23 +527,28 @@ static int xhci_mtk_probe(struct platform_device *pdev)
>  	xhci->imod_interval = 5000;
>  	device_property_read_u32(dev, "imod-interval-ns", &xhci->imod_interval);
>  
> -	xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
> +	/* Only create shared_hcd when USB3.0 port is available. */
> +	if (xhci->usb3_rhub.num_ports > 0) {
xhci->usb3_rhub.num_ports is not set until usb_add_hcd() is called.

> +		xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
>  			dev_name(dev), hcd);
> -	if (!xhci->shared_hcd) {
> -		ret = -ENOMEM;
> -		goto disable_device_wakeup;
> +		if (!xhci->shared_hcd) {
> +			ret = -ENOMEM;
> +			goto disable_device_wakeup;
> +		}
>  	}
>  
>  	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
>  	if (ret)
>  		goto put_usb3_hcd;
>  
> -	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
> -		xhci->shared_hcd->can_do_streams = 1;
> +	if (xhci->usb3_rhub.num_ports > 0) {
> +		if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
> +			xhci->shared_hcd->can_do_streams = 1;
>  
> -	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> -	if (ret)
> -		goto dealloc_usb2_hcd;
> +		ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> +		if (ret)
> +			goto dealloc_usb2_hcd;
> +	}
>  
>  	return 0;
>  
> @@ -552,7 +557,8 @@ static int xhci_mtk_probe(struct platform_device *pdev)
>  
>  put_usb3_hcd:
>  	xhci_mtk_sch_exit(mtk);
> -	usb_put_hcd(xhci->shared_hcd);
> +	if (xhci->shared_hcd)
> +		usb_put_hcd(xhci->shared_hcd);
>  
>  disable_device_wakeup:
>  	device_init_wakeup(dev, false);
> @@ -579,12 +585,14 @@ static int xhci_mtk_remove(struct platform_device *dev)
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  	struct usb_hcd  *shared_hcd = xhci->shared_hcd;
>  
> -	usb_remove_hcd(shared_hcd);
> +	if (shared_hcd)
> +		usb_remove_hcd(shared_hcd);
>  	xhci->shared_hcd = NULL;
>  	device_init_wakeup(&dev->dev, false);
>  
>  	usb_remove_hcd(hcd);
> -	usb_put_hcd(shared_hcd);
> +	if (shared_hcd)
> +		usb_put_hcd(shared_hcd);
>  	usb_put_hcd(hcd);
>  	xhci_mtk_sch_exit(mtk);
>  	xhci_mtk_clks_disable(mtk);
> @@ -611,8 +619,10 @@ static int __maybe_unused xhci_mtk_suspend(struct device *dev)
>  	xhci_dbg(xhci, "%s: stop port polling\n", __func__);
>  	clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
>  	del_timer_sync(&hcd->rh_timer);
> -	clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
> -	del_timer_sync(&xhci->shared_hcd->rh_timer);
> +	if (xhci->shared_hcd) {
> +		clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
> +		del_timer_sync(&xhci->shared_hcd->rh_timer);
> +	}
>  
>  	xhci_mtk_host_disable(mtk);
>  	xhci_mtk_clks_disable(mtk);
> @@ -631,8 +641,10 @@ static int __maybe_unused xhci_mtk_resume(struct device *dev)
>  	xhci_mtk_host_enable(mtk);
>  
>  	xhci_dbg(xhci, "%s: restart port polling\n", __func__);
> -	set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
> -	usb_hcd_poll_rh_status(xhci->shared_hcd);
> +	if (xhci->shared_hcd) {
> +		set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
> +		usb_hcd_poll_rh_status(xhci->shared_hcd);
> +	}
>  	set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
>  	usb_hcd_poll_rh_status(hcd);
>  	return 0;