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

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Date:   Tue, 2 Jan 2018 09:41:38 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Kishon Vijay Abraham I <kishon@...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 Thu, 2017-12-28 at 16:44 +0530, Kishon Vijay Abraham I wrote:
> 
> 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 a lot
> 
> 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);
> >