linux-kernel - Re: [PATCH 1/3] phy: phy-mtk-tphy: use auto instead of force to bypass utmi signals

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Message-ID: <3eb63ed0-5e56-d664-4953-b1998d7bd19f@ti.com>
Date:   Thu, 28 Dec 2017 16:44:02 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 1/3] phy: phy-mtk-tphy: use auto instead of force to
 bypass utmi signals



On Thursday 07 December 2017 05:23 PM, Chunfeng Yun wrote:
> When system is running, if usb2 phy is forced to bypass utmi signals,
> all PLL will be turned off, and it can't detect device connection
> anymore, so replace force mode with auto mode which can bypass utmi
> signals automatically if no device attached for normal flow.
> But keep the force mode to fix RX sensitivity degradation issue.
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

merged this series.

Thanks
Kishon
> ---
>  drivers/phy/mediatek/phy-mtk-tphy.c | 19 +++++++------------
>  1 file changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
> index fb8aba4..5d9d7f3 100644
> --- a/drivers/phy/mediatek/phy-mtk-tphy.c
> +++ b/drivers/phy/mediatek/phy-mtk-tphy.c
> @@ -440,9 +440,9 @@ static void u2_phy_instance_init(struct mtk_tphy *tphy,
>  	u32 index = instance->index;
>  	u32 tmp;
>  
> -	/* switch to USB function. (system register, force ip into usb mode) */
> +	/* switch to USB function, and enable usb pll */
>  	tmp = readl(com + U3P_U2PHYDTM0);
> -	tmp &= ~P2C_FORCE_UART_EN;
> +	tmp &= ~(P2C_FORCE_UART_EN | P2C_FORCE_SUSPENDM);
>  	tmp |= P2C_RG_XCVRSEL_VAL(1) | P2C_RG_DATAIN_VAL(0);
>  	writel(tmp, com + U3P_U2PHYDTM0);
>  
> @@ -502,10 +502,8 @@ static void u2_phy_instance_power_on(struct mtk_tphy *tphy,
>  	u32 index = instance->index;
>  	u32 tmp;
>  
> -	/* (force_suspendm=0) (let suspendm=1, enable usb 480MHz pll) */
>  	tmp = readl(com + U3P_U2PHYDTM0);
> -	tmp &= ~(P2C_FORCE_SUSPENDM | P2C_RG_XCVRSEL);
> -	tmp &= ~(P2C_RG_DATAIN | P2C_DTM0_PART_MASK);
> +	tmp &= ~(P2C_RG_XCVRSEL | P2C_RG_DATAIN | P2C_DTM0_PART_MASK);
>  	writel(tmp, com + U3P_U2PHYDTM0);
>  
>  	/* OTG Enable */
> @@ -540,7 +538,6 @@ static void u2_phy_instance_power_off(struct mtk_tphy *tphy,
>  
>  	tmp = readl(com + U3P_U2PHYDTM0);
>  	tmp &= ~(P2C_RG_XCVRSEL | P2C_RG_DATAIN);
> -	tmp |= P2C_FORCE_SUSPENDM;
>  	writel(tmp, com + U3P_U2PHYDTM0);
>  
>  	/* OTG Disable */
> @@ -548,18 +545,16 @@ static void u2_phy_instance_power_off(struct mtk_tphy *tphy,
>  	tmp &= ~PA6_RG_U2_OTG_VBUSCMP_EN;
>  	writel(tmp, com + U3P_USBPHYACR6);
>  
> -	/* let suspendm=0, set utmi into analog power down */
> -	tmp = readl(com + U3P_U2PHYDTM0);
> -	tmp &= ~P2C_RG_SUSPENDM;
> -	writel(tmp, com + U3P_U2PHYDTM0);
> -	udelay(1);
> -
>  	tmp = readl(com + U3P_U2PHYDTM1);
>  	tmp &= ~(P2C_RG_VBUSVALID | P2C_RG_AVALID);
>  	tmp |= P2C_RG_SESSEND;
>  	writel(tmp, com + U3P_U2PHYDTM1);
>  
>  	if (tphy->pdata->avoid_rx_sen_degradation && index) {
> +		tmp = readl(com + U3P_U2PHYDTM0);
> +		tmp &= ~(P2C_RG_SUSPENDM | P2C_FORCE_SUSPENDM);
> +		writel(tmp, com + U3P_U2PHYDTM0);
> +
>  		tmp = readl(com + U3D_U2PHYDCR0);
>  		tmp &= ~P2C_RG_SIF_U2PLL_FORCE_ON;
>  		writel(tmp, com + U3D_U2PHYDCR0);
>