linux-kernel - Re: [PATCH] usb: phy: mxs: Disable external charger detect in mxs_phy_hw

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Message-ID: <20190605091943.GN29853@dragon>
Date:   Wed, 5 Jun 2019 17:19:44 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-usb@...r.kernel.org, Chris Healy <cphealy@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: phy: mxs: Disable external charger detect in
 mxs_phy_hw_init()

On Tue, May 28, 2019 at 11:59:48PM -0700, Andrey Smirnov wrote:
> Since this driver already handles changer detction state, copy the
> workaround code currently residing in arch/arm/mach-imx/anatop.c into
> this drier to consolidate the places modifying it.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: NXP Linux Team <linux-imx@....com>
> Cc: linux-usb@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Shawn Guo <shawnguo@...nel.org>

> ---
> 
> The intent of this patch is to consolidate all of the code maipulating
> charge detection state to a signle place and if this patch is agreed
> upon I plan to follow it up with this change:
> 
> https://github.com/ndreys/linux/commit/7248f2b85b4706760fd33d2ff970e2ea12d3bea7
> 
> Thanks,
> Andrey Smirnov
> 
>  drivers/usb/phy/phy-mxs-usb.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
> index 1b1bb0ad40c3..6fa16ab31e2e 100644
> --- a/drivers/usb/phy/phy-mxs-usb.c
> +++ b/drivers/usb/phy/phy-mxs-usb.c
> @@ -63,6 +63,7 @@
>  
>  #define ANADIG_USB1_CHRG_DETECT_SET		0x1b4
>  #define ANADIG_USB1_CHRG_DETECT_CLR		0x1b8
> +#define ANADIG_USB2_CHRG_DETECT_SET		0x214
>  #define ANADIG_USB1_CHRG_DETECT_EN_B		BIT(20)
>  #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B	BIT(19)
>  #define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT	BIT(18)
> @@ -250,6 +251,19 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
>  	if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
>  		writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);
>  
> +	if (mxs_phy->regmap_anatop) {
> +		unsigned int reg = mxs_phy->port_id ?
> +			ANADIG_USB1_CHRG_DETECT_SET :
> +			ANADIG_USB2_CHRG_DETECT_SET;
> +		/*
> +		 * The external charger detector needs to be disabled,
> +		 * or the signal at DP will be poor
> +		 */
> +		regmap_write(mxs_phy->regmap_anatop, reg,
> +			     ANADIG_USB1_CHRG_DETECT_EN_B |
> +			     ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B);
> +	}
> +
>  	mxs_phy_tx_init(mxs_phy);
>  
>  	return 0;
> -- 
> 2.21.0
>