linux-kernel - Re: [PATCH] usb: chipidea: imx: Do not access CLKONOFF on i.MX51

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Date:   Tue, 9 May 2017 08:47:09 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
CC:     Peter Chen <peter.chen@....com>, <cphealy@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: chipidea: imx: Do not access CLKONOFF on i.MX51

On Mon, May 08, 2017 at 07:15:01AM -0700, Andrey Smirnov wrote:
> Unlike i.MX53, i.MX51's USBOH3 register file does not implemenent
> registers past offset 0x018, which includes
> MX53_USB_CLKONOFF_CTRL_OFFSET and trying to access that register on
> said platform results in external abort.
> 
> Fix it by enabling CLKONOFF accessing codepath only for i.MX53.
> 
> Fixes 3be3251db0887f721f9c110e1966900922fc4ff4
> ("usb: chipidea: imx: Disable internal 60Mhz clock with ULPI PHY")
> 
> Cc: cphealy@...il.com
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> ---
>  drivers/usb/chipidea/usbmisc_imx.c | 44 +++++++++++++++++++++++++++++---------
>  1 file changed, 34 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
> index e77a4ed..fc21f92 100644
> --- a/drivers/usb/chipidea/usbmisc_imx.c
> +++ b/drivers/usb/chipidea/usbmisc_imx.c
> @@ -195,7 +195,7 @@ static int usbmisc_imx27_init(struct imx_usbmisc_data *data)
>  	return 0;
>  }
>  
> -static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
> +static int usbmisc_imx5x_init(struct imx_usbmisc_data *data, bool has_clkonoff)
>  {
>  	struct imx_usbmisc *usbmisc = dev_get_drvdata(data->dev);
>  	void __iomem *reg = NULL;
> @@ -242,10 +242,15 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
>  				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
>  			writel(val, reg);
> -			/* Disable internal 60Mhz clock */
> -			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
> -			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
> -			writel(val, reg);
> +			if (has_clkonoff) {
> +				/* Disable internal 60Mhz clock */
> +				reg = usbmisc->base +
> +					MX53_USB_CLKONOFF_CTRL_OFFSET;
> +				val = readl(reg) |
> +					MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
> +				writel(val, reg);
> +			}
> +
>  		}
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
> @@ -267,10 +272,15 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
>  				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
>  			writel(val, reg);
> -			/* Disable internal 60Mhz clock */
> -			reg = usbmisc->base + MX53_USB_CLKONOFF_CTRL_OFFSET;
> -			val = readl(reg) | MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
> -			writel(val, reg);
> +
> +			if (has_clkonoff) {
> +				/* Disable internal 60Mhz clock */
> +				reg = usbmisc->base +
> +					MX53_USB_CLKONOFF_CTRL_OFFSET;
> +				val = readl(reg) |
> +					MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
> +				writel(val, reg);
> +			}
>  		}
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
> @@ -285,6 +295,16 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  	return 0;
>  }
>  
> +static int usbmisc_imx51_init(struct imx_usbmisc_data *data)
> +{
> +	return usbmisc_imx5x_init(data, false);
> +}
> +
> +static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
> +{
> +	return usbmisc_imx5x_init(data, true);
> +}
> +
>  static int usbmisc_imx6q_set_wakeup
>  	(struct imx_usbmisc_data *data, bool enabled)
>  {
> @@ -456,6 +476,10 @@ static const struct usbmisc_ops imx27_usbmisc_ops = {
>  	.init = usbmisc_imx27_init,
>  };
>  
> +static const struct usbmisc_ops imx51_usbmisc_ops = {
> +	.init = usbmisc_imx51_init,
> +};
> +
>  static const struct usbmisc_ops imx53_usbmisc_ops = {
>  	.init = usbmisc_imx53_init,
>  };
> @@ -536,7 +560,7 @@ static const struct of_device_id usbmisc_imx_dt_ids[] = {
>  	},
>  	{
>  		.compatible = "fsl,imx51-usbmisc",
> -		.data = &imx53_usbmisc_ops,
> +		.data = &imx51_usbmisc_ops,
>  	},
>  	{
>  		.compatible = "fsl,imx53-usbmisc",

Thanks for fixing it.

I prefer using is_imx53_usbmisc stands for if it is imx53 usbmisc
at usbmisc_imx53_init to fix it, you can prefer to:
drivers/usb/phy/phy-mxs-usb.c.

-- 

Best Regards,
Peter Chen