linux-kernel - Re: [PATCH 1/2] phy: qcom-qmp: Add MSM8996 UFS QMP support

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Date:   Wed, 18 Dec 2019 23:06:58 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] phy: qcom-qmp: Add MSM8996 UFS QMP support

On Wed 18 Dec 20:20 PST 2019, Vinod Koul wrote:

> On 07-12-19, 12:21, Bjorn Andersson wrote:
> > The support for the 14nm MSM8996 UFS PHY is currently handled by the
> > UFS-specific 14nm QMP driver, due to the earlier need for additional
> > operations beyond the standard PHY API.
> > 
> > Add support for this PHY to the common QMP driver, to allow us to remove
> > the old driver.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  .../devicetree/bindings/phy/qcom-qmp-phy.txt  |   5 +
> >  drivers/phy/qualcomm/phy-qcom-qmp.c           | 106 ++++++++++++++++++
> >  2 files changed, 111 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
> > index eac9ad3cbbc8..5b99cf081817 100644
> > --- a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
> > +++ b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
> > @@ -8,6 +8,7 @@ Required properties:
> >   - compatible: compatible list, contains:
> >  	       "qcom,ipq8074-qmp-pcie-phy" for PCIe phy on IPQ8074
> >  	       "qcom,msm8996-qmp-pcie-phy" for 14nm PCIe phy on msm8996,
> > +	       "qcom,msm8996-qmp-ufs-phy" for 14nm UFS phy on msm8996,
> >  	       "qcom,msm8996-qmp-usb3-phy" for 14nm USB3 phy on msm8996,
> >  	       "qcom,msm8998-qmp-usb3-phy" for USB3 QMP V3 phy on msm8998,
> >  	       "qcom,msm8998-qmp-ufs-phy" for UFS QMP phy on msm8998,
> > @@ -44,6 +45,8 @@ Required properties:
> >  		For "qcom,ipq8074-qmp-pcie-phy": no clocks are listed.
> >  		For "qcom,msm8996-qmp-pcie-phy" must contain:
> >  			"aux", "cfg_ahb", "ref".
> > +		For "qcom,msm8996-qmp-ufs-phy" must contain:
> > +			"ref".
> >  		For "qcom,msm8996-qmp-usb3-phy" must contain:
> >  			"aux", "cfg_ahb", "ref".
> >  		For "qcom,msm8998-qmp-usb3-phy" must contain:
> > @@ -72,6 +75,8 @@ Required properties:
> >  			"phy", "common".
> >  		For "qcom,msm8996-qmp-pcie-phy" must contain:
> >  			"phy", "common", "cfg".
> > +		For "qcom,msm8996-qmp-ufs-phy": must contain:
> > +			"ufsphy".
> >  		For "qcom,msm8996-qmp-usb3-phy" must contain
> >  			"phy", "common".
> >  		For "qcom,msm8998-qmp-usb3-phy" must contain
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > index a6b8fc5798e2..d81516c4d747 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > @@ -121,6 +121,11 @@ enum qphy_reg_layout {
> >  	QPHY_PCS_LFPS_RXTERM_IRQ_STATUS,
> >  };
> >  
> > +static const unsigned int msm8996_ufsphy_regs_layout[] = {
> > +	[QPHY_START_CTRL]		= 0x00,
> > +	[QPHY_PCS_READY_STATUS]		= 0x168,
> > +};
> > +
> >  static const unsigned int pciephy_regs_layout[] = {
> >  	[QPHY_COM_SW_RESET]		= 0x400,
> >  	[QPHY_COM_POWER_DOWN_CONTROL]	= 0x404,
> > @@ -330,6 +335,75 @@ static const struct qmp_phy_init_tbl msm8998_pcie_pcs_tbl[] = {
> >  	QMP_PHY_INIT_CFG(QPHY_V3_PCS_SIGDET_CNTRL, 0x03),
> >  };
> >  
> > +static const struct qmp_phy_init_tbl msm8996_ufs_serdes_tbl[] = {
> > +	QMP_PHY_INIT_CFG(QPHY_POWER_DOWN_CONTROL, 0x01),
> 
> Can you check this after adding the reset for ufs, I suspect you might
> run into same issue as I am seeing on 8150, power down here does not
> seem correct.
> 

I'm not sure why we need to tickle POWER_DOWN here, but it's documented
as such, done in the old driver and without it the PHY does not come up.

Regards,
Bjorn