linux-kernel - Re: [PATCH 2/4] usb: host: xhci: Introduce one new 'usb3_slow

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Date:	Thu, 18 Aug 2016 10:18:00 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Baolin Wang <baolin.wang@...aro.org>, gregkh@...uxfoundation.org
Cc:	mathias.nyman@...el.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, broonie@...nel.org,
	baolin.wang@...aro.org
Subject: Re: [PATCH 2/4] usb: host: xhci: Introduce one new 'usb3_slow_suspend' member for xhci private data


Hi,

Baolin Wang <baolin.wang@...aro.org> writes:
> Now some usb controllers (such as dwc3 controller) need 'XHCI_SLOW_SUSPEND'
> quirk when suspending the xhci, thus we need to add 'usb3_slow_suspend' member
> in xhci platform data to support this.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
>  drivers/usb/host/xhci-plat.c     |    3 +++
>  include/linux/usb/xhci_pdriver.h |    3 +++
>  2 files changed, 6 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index e2e2487..162f17c 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -250,6 +250,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
>  			(pdata && pdata->usb3_lpm_capable))
>  		xhci->quirks |= XHCI_LPM_SUPPORT;
>  
> +	if (pdata && pdata->usb3_slow_suspend)
> +		xhci->quirks |= XHCI_SLOW_SUSPEND;

I remember having a discussion about this with Paul Z and it turned out
that we really didn't need SLOW_SUSPEND. Can you describe further in
what situation you need this quirk?

-- 
balbi

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