Re: [PATCH] usb: dwc3: remove generic PHYs forwarding for XHCI device

[Felipe Balbi <balbi@kernel.org>]

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Hi,

Marek Szyprowski <m.szyprowski@samsung.com> writes:

> Commit 08f871a3aca2 ("usb: dwc3: host: convey the PHYs to xhci") added
> forwarding of the generic PHYs from DWC3 core to the instantiated XHCI-plat
> device. However XHCI(-plat) driver never gained support for generic PHYs,
> thus the lookup added by that commit is never used. In meantime the commit
> d64ff406e51e ("usb: dwc3: use bus->sysdev for DMA configuration")
> incorrectly changed the device used for creating lookup, making the lookup
> useless and generic PHYs inaccessible from XHCI device.
>
> However since commit 178a0bce05cb ("usb: core: hcd: integrate the PHY
> wrapper into the HCD core") USB HCD already handles generic PHYs acquired
> from the HCD's 'sysdev', which in this case is DWC3 core device. This means
> that creating any custom lookup entries for XHCI driver is no longer needed
> and can be simply removed.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>  drivers/usb/dwc3/host.c | 22 ++++------------------
>  1 file changed, 4 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index f55947294f7c..8deea8c91e03 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -85,7 +85,7 @@ int dwc3_host_init(struct dwc3 *dwc)
>  						DWC3_XHCI_RESOURCES_NUM);
>  	if (ret) {
>  		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
> -		goto err1;
> +		goto err;
>  	}
>  
>  	memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));
> @@ -112,37 +112,23 @@ int dwc3_host_init(struct dwc3 *dwc)
>  		ret = platform_device_add_properties(xhci, props);
>  		if (ret) {
>  			dev_err(dwc->dev, "failed to add properties to xHCI\n");
> -			goto err1;
> +			goto err;
>  		}
>  	}
>  
> -	phy_create_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(dwc->dev));
> -	phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(dwc->dev));
> -
>  	ret = platform_device_add(xhci);
>  	if (ret) {
>  		dev_err(dwc->dev, "failed to register xHCI device\n");
> -		goto err2;
> +		goto err;
>  	}
>  
>  	return 0;
> -err2:
> -	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(dwc->dev));
> -	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(dwc->dev));
> -err1:
> +err:
>  	platform_device_put(xhci);
>  	return ret;
>  }
>  
>  void dwc3_host_exit(struct dwc3 *dwc)
>  {
> -	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(dwc->dev));
> -	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(dwc->dev));
>  	platform_device_unregister(dwc->xhci);
>  }

Roger, could you verify that this doesn't regress any of your platforms?

Thanks

-- 
balbi

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