linux-kernel - Re: [PATCH v4 09/16] phy: qcom-qmp-pcie: add register init helper

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Date:   Sat, 5 Nov 2022 14:17:01 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 09/16] phy: qcom-qmp-pcie: add register init helper

On Sat, Nov 05, 2022 at 05:38:54PM +0530, Vinod Koul wrote:
> On 28-10-22, 15:35, Johan Hovold wrote:
> > Generalise the serdes initialisation helper so that it can be used to
> > initialise all the PHY registers (e.g. serdes, tx, rx, pcs).
> > 
> > Note that this defers the ungating of the PIPE clock somewhat, which is
> > fine as it isn't needed until starting the PHY.
> > 
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 37 +++++-------------------
> >  1 file changed, 8 insertions(+), 29 deletions(-)
> > 
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > index 791ed7ef0eab..f57d10f20277 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > @@ -1820,27 +1820,22 @@ static void qmp_pcie_configure(void __iomem *base,
> >  	qmp_pcie_configure_lane(base, tbl, num, 0xff);
> >  }
> >  
> > -static void qmp_pcie_serdes_init(struct qmp_pcie *qmp, const struct qmp_phy_cfg_tables *tbls)
> > -{
> > -	void __iomem *serdes = qmp->serdes;
> > -
> > -	if (!tbls)
> > -		return;
> > -
> > -	qmp_pcie_configure(serdes, tbls->serdes, tbls->serdes_num);
> > -}
> > -
> > -static void qmp_pcie_lanes_init(struct qmp_pcie *qmp, const struct qmp_phy_cfg_tables *tbls)
> > +static void qmp_pcie_init_registers(struct qmp_pcie *qmp, const struct qmp_phy_cfg_tables *tbls)
> >  {
> >  	const struct qmp_phy_cfg *cfg = qmp->cfg;
> > +	void __iomem *serdes = qmp->serdes;
> >  	void __iomem *tx = qmp->tx;
> >  	void __iomem *rx = qmp->rx;
> >  	void __iomem *tx2 = qmp->tx2;
> >  	void __iomem *rx2 = qmp->rx2;
> > +	void __iomem *pcs = qmp->pcs;
> > +	void __iomem *pcs_misc = qmp->pcs_misc;
> >  
> >  	if (!tbls)
> >  		return;
> >  
> > +	qmp_pcie_configure(serdes, tbls->serdes, tbls->serdes_num);
> 
> We are tbls

Yeah, it's a separate function.

Note that qmp_pcie_configure_lane() above use 'tbl' too.

> > +
> >  	qmp_pcie_configure_lane(tx, tbls->tx, tbls->tx_num, 1);
> >  	qmp_pcie_configure_lane(rx, tbls->rx, tbls->rx_num, 1);
> >  
> > @@ -1848,15 +1843,6 @@ static void qmp_pcie_lanes_init(struct qmp_pcie *qmp, const struct qmp_phy_cfg_t
> >  		qmp_pcie_configure_lane(tx2, tbls->tx, tbls->tx_num, 2);
> >  		qmp_pcie_configure_lane(rx2, tbls->rx, tbls->rx_num, 2);
> >  	}
> > -}
> > -
> > -static void qmp_pcie_pcs_init(struct qmp_pcie *qmp, const struct qmp_phy_cfg_tables *tbls)
> > -{
> > -	void __iomem *pcs = qmp->pcs;
> > -	void __iomem *pcs_misc = qmp->pcs_misc;
> > -
> > -	if (!tbls)
> > -		return;
> >  
> >  	qmp_pcie_configure(pcs, tbls->pcs, tbls->pcs_num);
> >  	qmp_pcie_configure(pcs_misc, tbls->pcs_misc, tbls->pcs_misc_num);
> > @@ -1932,8 +1918,8 @@ static int qmp_pcie_power_on(struct phy *phy)
> >  	else
> >  		mode_tables = cfg->tables_ep;
> >  
> > -	qmp_pcie_serdes_init(qmp, &cfg->tables);
> > -	qmp_pcie_serdes_init(qmp, mode_tables);
> > +	qmp_pcie_init_registers(qmp, &cfg->tables);
> > +	qmp_pcie_init_registers(qmp, mode_tables);
> 
> but here tables :(
> 
> Lets stick with either please, or if we have differentiation lets make
> it real obvious

It's not uncommon to use shorter local identifiers and a more descriptive
name in structures, but since the driver already used 'tbl' consistently
before the recent addition of the aggregate tables structure, I can
rename also those pointers so that we use 'tbl' and 'tbls' consistently
throughout the driver.

Johan