linux-kernel - Re: [PATCH v7 1/2] usb: host: xhci-plat: Get PHYs for xhci's hcds

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Message-ID: <545393CE.8070102@cogentembedded.com>
Date:	Fri, 31 Oct 2014 16:51:10 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>, linux-usb@...r.kernel.org
CC:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
	kishon@...com, balbi@...com, stern@...land.harvard.edu,
	kgene.kim@...sung.com, heikki.krogerus@...ux.intel.com,
	mathias.nyman@...el.com, jwerner@...gle.com, jg1.han@...sung.com
Subject: Re: [PATCH v7 1/2] usb: host: xhci-plat: Get PHYs for xhci's hcds

Hello.

On 10/31/2014 4:26 PM, Vivek Gautam wrote:

> The host controller by itself may sometimes need to handle PHY
> and re-initialize it to re-configure some of the PHY parameters
> to get full support out of the PHY controller.
> Therefore, facilitate getting the two possible PHYs, viz.
> USB 2.0 type (UTMI+) and USB 3.0 type (PIPE3), and initialize them.

> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
>   drivers/usb/host/xhci-plat.c |   74 ++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 74 insertions(+)

> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 3d78b0c..5207d5b 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
[...]
> @@ -129,10 +130,41 @@ static int xhci_plat_probe(struct platform_device *pdev)
>   			goto put_hcd;
>   	}
>
> +	/* Get possile USB 2.0 type PHY (UTMI+) available with xhci */
> +	hcd->phy = devm_phy_get(&pdev->dev, "usb2-phy");
> +	if (IS_ERR(hcd->phy)) {
> +		ret = PTR_ERR(hcd->phy);
> +		if (ret == -EPROBE_DEFER) {
> +			goto disable_clk;
> +		} else if (ret != -ENOSYS && ret != -ENODEV) {

    Asking to be a *switch* statement instead...

> +			hcd->phy = NULL;
> +			dev_warn(&pdev->dev,
> +				 "Error retrieving usb2 phy: %d\n", ret);
> +		}
> +	}
> +
[...]
> @@ -158,12 +190,41 @@ static int xhci_plat_probe(struct platform_device *pdev)
>   	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
>   		xhci->shared_hcd->can_do_streams = 1;
>
> +	/* Get possile USB 3.0 type PHY (PIPE3) available with xhci */
> +	xhci->shared_hcd->phy = devm_phy_get(&pdev->dev, "usb3-phy");
> +	if (IS_ERR(xhci->shared_hcd->phy)) {
> +		ret = PTR_ERR(xhci->shared_hcd->phy);
> +		if (ret == -EPROBE_DEFER) {
> +			goto put_usb3_hcd;
> +		} else if (ret != -ENOSYS && ret != -ENODEV) {

    Likewise...

> +			xhci->shared_hcd->phy = NULL;
> +			dev_warn(&pdev->dev,
> +				 "Error retrieving usb3 phy: %d\n", ret);
> +		}
> +	}
> +
[...]
> @@ -204,6 +271,8 @@ static int xhci_plat_suspend(struct device *dev)
>   	struct usb_hcd	*hcd = dev_get_drvdata(dev);
>   	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>
> +	phy_exit(hcd->phy);

    Hm, in the suspend() method?

> +
>   	return xhci_suspend(xhci);
>   }
>
[...]

WBR, Sergei

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