linux-kernel - R: [PATCH v3 09/11] PCI: qcom: add ipq8064 rev2 variant and set tx term offset

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Date:   Sat, 9 May 2020 00:00:29 +0200
From:   <ansuelsmth@...il.com>
To:     "'Rob Herring'" <robh@...nel.org>
Cc:     "'Bjorn Andersson'" <bjorn.andersson@...aro.org>,
        "'Sham Muthayyan'" <smuthayy@...eaurora.org>,
        "'Andy Gross'" <agross@...nel.org>,
        "'Bjorn Helgaas'" <bhelgaas@...gle.com>,
        "'Mark Rutland'" <mark.rutland@....com>,
        "'Stanimir Varbanov'" <svarbanov@...sol.com>,
        "'Lorenzo Pieralisi'" <lorenzo.pieralisi@....com>,
        "'Andrew Murray'" <amurray@...goodpenguin.co.uk>,
        "'Philipp Zabel'" <p.zabel@...gutronix.de>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: R: [PATCH v3 09/11] PCI: qcom: add ipq8064 rev2 variant and set tx term offset

> On Fri, May 01, 2020 at 12:06:16AM +0200, Ansuel Smith wrote:
> > From: Sham Muthayyan <smuthayy@...eaurora.org>
> >
> > Add tx term offset support to pcie qcom driver need in some revision of
> > the ipq806x SoC.
> > Ipq8064 have tx term offset set to 7.
> > Ipq8064-v2 revision and ipq8065 have the tx term offset set to 0.
> >
> > Signed-off-by: Sham Muthayyan <smuthayy@...eaurora.org>
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> >  drivers/pci/controller/dwc/pcie-qcom.c | 15 +++++++++++++++
> >  1 file changed, 15 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c
> b/drivers/pci/controller/dwc/pcie-qcom.c
> > index da8058fd1925..372d2c8508b5 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -45,6 +45,9 @@
> >  #define PCIE_CAP_CPL_TIMEOUT_DISABLE		0x10
> >
> >  #define PCIE20_PARF_PHY_CTRL			0x40
> > +#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(12,
> 16)
> > +#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
> > +
> >  #define PCIE20_PARF_PHY_REFCLK			0x4C
> >  #define PHY_REFCLK_SSP_EN			BIT(16)
> >  #define PHY_REFCLK_USE_PAD			BIT(12)
> > @@ -118,6 +121,7 @@ struct qcom_pcie_resources_2_1_0 {
> >  	u32 tx_swing_full;
> >  	u32 tx_swing_low;
> >  	u32 rx0_eq;
> > +	u8 phy_tx0_term_offset;
> >  };
> >
> >  struct qcom_pcie_resources_1_0_0 {
> > @@ -318,6 +322,11 @@ static int
> qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
> >  	if (IS_ERR(res->ext_reset))
> >  		return PTR_ERR(res->ext_reset);
> >
> > +	if (of_device_is_compatible(dev->of_node, "qcom,pcie-ipq8064"))
> > +		res->phy_tx0_term_offset = 7;
> 
> Based on my other comments, you'll want to turn this into match data.
> 

I don't understand what you mean here. I really can't think of another way
to set this only for qcom,pci-ipq8064 as ipq8064-v2 and apq8064 use the
same get resource function. Should I create a different get_resources for
the other 2 device?
 
> > +	else
> > +		res->phy_tx0_term_offset = 0;
> > +