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SubjectRe: [usb-next PATCH] usb: xhci: skip phys initialization of shared hcd
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Hi Roger,

On Wed, 2018-03-21 at 11:05 +0200, Roger Quadros wrote:
> 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@mediatek.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?
Yes, the primary and shared HCDs will get the same PHYs provided by
"phys" property.

>
> Also how can you be sure that phy_init() has been done for all platform HCD users?
Here I assume that "phys" and "usb-phy" properties are not used at the
same time. There are two cases:
1. Using "usb-phy": no "phys" to be got by shared HCD.
2. Using "phys": the primary HCD will get those phys, so shared HCD can
skip them.

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


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