linux-kernel - Re: [PATCH v4 2/3] usb: chipidea: imx: configure imx for ULPI phy

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Date:   Wed, 21 Sep 2016 15:12:14 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] usb: chipidea: imx: configure imx for ULPI phy

On Mon, Sep 19, 2016 at 01:45:39PM +0200, Fabien Lahoudere wrote:
> In order to use ULPI phy with usb host 2 and 3, we need to configure
> controller register to enable ULPI features.
> 
> Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
> ---
>  drivers/usb/chipidea/ci_hdrc_imx.c |  5 +++++
>  drivers/usb/chipidea/ci_hdrc_imx.h |  1 +
>  drivers/usb/chipidea/usbmisc_imx.c | 37 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 43 insertions(+)
> 
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
> index 0991794..96c0e33 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.c
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.c
> @@ -18,6 +18,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/usb/chipidea.h>
> +#include <linux/usb/of.h>
>  #include <linux/clk.h>
>  
>  #include "ci.h"
> @@ -146,6 +147,10 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
>  	if (of_find_property(np, "external-vbus-divider", NULL))
>  		data->evdo = 1;
>  
> +
> +	if (of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI)
> +		data->ulpi = 1;
> +
>  	return data;
>  }
>  
> diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
> index 409aa5ca8..d666c9f 100644
> --- a/drivers/usb/chipidea/ci_hdrc_imx.h
> +++ b/drivers/usb/chipidea/ci_hdrc_imx.h
> @@ -19,6 +19,7 @@ struct imx_usbmisc_data {
>  	unsigned int disable_oc:1; /* over current detect disabled */
>  	unsigned int oc_polarity:1; /* over current polarity if oc enabled */
>  	unsigned int evdo:1; /* set external vbus divider option */
> +	unsigned int ulpi:1; /* connected to an ULPI phy */
>  };
>  
>  int imx_usbmisc_init(struct imx_usbmisc_data *);
> diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
> index 9549821..11f51bd 100644
> --- a/drivers/usb/chipidea/usbmisc_imx.c
> +++ b/drivers/usb/chipidea/usbmisc_imx.c
> @@ -46,11 +46,20 @@
>  
>  #define MX53_USB_OTG_PHY_CTRL_0_OFFSET	0x08
>  #define MX53_USB_OTG_PHY_CTRL_1_OFFSET	0x0c
> +#define MX53_USB_CTRL_1_OFFSET	        0x10
> +#define MX53_USB_CTRL_1_H2_XCVR_CLK_SEL_MASK (0x11 << 2)
> +#define MX53_USB_CTRL_1_H2_XCVR_CLK_SEL_ULPI BIT(2)
> +#define MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_MASK (0x11 << 6)
> +#define MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_ULPI BIT(6)
>  #define MX53_USB_UH2_CTRL_OFFSET	0x14
>  #define MX53_USB_UH3_CTRL_OFFSET	0x18
>  #define MX53_BM_OVER_CUR_DIS_H1		BIT(5)
>  #define MX53_BM_OVER_CUR_DIS_OTG	BIT(8)
>  #define MX53_BM_OVER_CUR_DIS_UHx	BIT(30)
> +#define MX53_USB_CTRL_1_UH2_ULPI_EN	BIT(26)
> +#define MX53_USB_CTRL_1_UH3_ULPI_EN	BIT(27)
> +#define MX53_USB_UHx_CTRL_WAKE_UP_EN	BIT(7)
> +#define MX53_USB_UHx_CTRL_ULPI_INT_EN	BIT(8)
>  #define MX53_USB_PHYCTRL1_PLLDIV_MASK	0x3
>  #define MX53_USB_PLL_DIV_24_MHZ		0x01
>  
> @@ -217,6 +226,20 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  		}
>  		break;
>  	case 2:
> +		if (data->ulpi) {
> +			/* set USBH2 into ULPI-mode. */
> +			reg = usbmisc->base + MX53_USB_CTRL_1_OFFSET;
> +			val = readl(reg) | MX53_USB_CTRL_1_UH2_ULPI_EN;
> +			/* select ULPI clock */
> +			val &= ~MX53_USB_CTRL_1_H2_XCVR_CLK_SEL_MASK;
> +			val |= MX53_USB_CTRL_1_H2_XCVR_CLK_SEL_ULPI;
> +			writel(val, reg);
> +			/* Set interrupt wake up enable */
> +			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
> +			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
> +				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
> +			writel(val, reg);
> +		}

Ok, it seems your 1st patch is just let code structure change be easy
in this one, and I may give the wrong comments that you had improved
disable oc code before.

If you agree with me, would you squash these two into one, and send
again. (delete "reg && val" is necessary).

Peter
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
>  			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
> @@ -224,6 +247,20 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
>  		}
>  		break;
>  	case 3:
> +		if (data->ulpi) {
> +			/* set USBH3 into ULPI-mode. */
> +			reg = usbmisc->base + MX53_USB_CTRL_1_OFFSET;
> +			val = readl(reg) | MX53_USB_CTRL_1_UH3_ULPI_EN;
> +			/* select ULPI clock */
> +			val &= ~MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_MASK;
> +			val |= MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_ULPI;
> +			writel(val, reg);
> +			/* Set interrupt wake up enable */
> +			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
> +			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
> +				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
> +			writel(val, reg);
> +		}
>  		if (data->disable_oc) {
>  			reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
>  			val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
> -- 
> 2.1.4
> 

-- 

Best Regards,
Peter Chen