linux-kernel - Re: [PATCH 1/2] usb: xhci-mtk: check hcc

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Date:   Wed, 8 Mar 2017 08:51:25 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.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>,
        Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH 1/2] usb: xhci-mtk: check hcc_params after adding
 primary hcd

On Tue, 2017-03-07 at 17:10 +0200, Mathias Nyman wrote:
> On 07.03.2017 05:32, Chunfeng Yun wrote:
> > hcc_params is set in xhci_gen_setup() called from usb_add_hcd(),
> > so checks the Maximum Primary Stream Array Size in the hcc_params
> > register after adding primary hcd.
> >
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >   drivers/usb/host/xhci-mtk.c |    6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> > index 9066ec9..6ac73a6 100644
> > --- a/drivers/usb/host/xhci-mtk.c
> > +++ b/drivers/usb/host/xhci-mtk.c
> > @@ -678,13 +678,13 @@ static int xhci_mtk_probe(struct platform_device *pdev)
> >   		goto power_off_phys;
> >   	}
> >
> > -	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
> > -		xhci->shared_hcd->can_do_streams = 1;
> > -
> >   	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;
> > +
> >   	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> >   	if (ret)
> >   		goto dealloc_usb2_hcd;
> >
> 
> Thanks.
> Looks like streams check has never worked for Mediatek xHC hosts,
> 
> Do you know if this has caused any issues?
> looks like it should go usb-linus and maybe stable kernels as well.
No issues on mt8173, because it doesn't support bulk stream. But it
causes a issue on the newest SoC which is not upstreamed, so I think it
needn't go stable kernels.

Thank you.
>   
> -Mathias