linux-kernel - Re: [PATCH v2 08/15] phy: qcom-qmp-pcie: add register init helper

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Date:   Wed, 19 Oct 2022 15:25:49 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...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>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/15] phy: qcom-qmp-pcie: add register init helper

On Wed, Oct 19, 2022 at 04:12:02PM +0300, Dmitry Baryshkov wrote:
> On 19/10/2022 14:35, 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 | 51 +++++++-----------------
> >   1 file changed, 15 insertions(+), 36 deletions(-)
> > 
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > index dd7e72424fc0..f57d10f20277 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > @@ -1820,46 +1820,32 @@ 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 *tables)
> > -{
> > -	void __iomem *serdes = qmp->serdes;
> > -
> > -	if (!tables)
> > -		return;
> > -
> > -	qmp_pcie_configure(serdes, tables->serdes, tables->serdes_num);
> > -}
> > -
> > -static void qmp_pcie_lanes_init(struct qmp_pcie *qmp, const struct qmp_phy_cfg_tables *tables)
> > +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 (!tables)
> > +	if (!tbls)
> >   		return;
> >   
> > -	qmp_pcie_configure_lane(tx, tables->tx, tables->tx_num, 1);
> > -	qmp_pcie_configure_lane(rx, tables->rx, tables->rx_num, 1);
> > +	qmp_pcie_configure(serdes, tbls->serdes, tbls->serdes_num);
> > +
> > +	qmp_pcie_configure_lane(tx, tbls->tx, tbls->tx_num, 1);
> > +	qmp_pcie_configure_lane(rx, tbls->rx, tbls->rx_num, 1);
> >   
> >   	if (cfg->lanes >= 2) {
> > -		qmp_pcie_configure_lane(tx2, tables->tx, tables->tx_num, 2);
> > -		qmp_pcie_configure_lane(rx2, tables->rx, tables->rx_num, 2);
> > +		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 *tables)
> > -{
> > -	void __iomem *pcs = qmp->pcs;
> > -	void __iomem *pcs_misc = qmp->pcs_misc;
> > -
> > -	if (!tables)
> > -		return;
> >   
> > -	qmp_pcie_configure(pcs, tables->pcs, tables->pcs_num);
> > -	qmp_pcie_configure(pcs_misc, tables->pcs_misc, tables->pcs_misc_num);
> > +	qmp_pcie_configure(pcs, tbls->pcs, tbls->pcs_num);
> > +	qmp_pcie_configure(pcs_misc, tbls->pcs_misc, tbls->pcs_misc_num);
> 
> Nit: could we please keep it as `tables'?

I considered that but found that the longer identifier hurt
readability so I prefer to use "tbls" here.

Compare

	qmp_pcie_configure(serdes, tbls->serdes, tbls->serdes_num);

	qmp_pcie_configure_lane(tx, tbls->tx, tbls->tx_num, 1);
	qmp_pcie_configure_lane(rx, tbls->rx, tbls->rx_num, 1);

	if (cfg->lanes >= 2) {
		qmp_pcie_configure_lane(tx2, tbls->tx, tbls->tx_num, 2);
		qmp_pcie_configure_lane(rx2, tbls->rx, tbls->rx_num, 2);
	}

	qmp_pcie_configure(pcs, tbls->pcs, tbls->pcs_num);
	qmp_pcie_configure(pcs_misc, tbls->pcs_misc, tbls->pcs_misc_num);

with

	qmp_pcie_configure(serdes, tables->serdes, tables->serdes_num);

	qmp_pcie_configure_lane(tx, tables->tx, tables->tx_num, 1);
	qmp_pcie_configure_lane(rx, tables->rx, tables->rx_num, 1);

	if (cfg->lanes >= 2) {
		qmp_pcie_configure_lane(tx2, tables->tx, tables->tx_num, 2);
		qmp_pcie_configure_lane(rx2, tables->rx, tables->rx_num, 2);
	}

	qmp_pcie_configure(pcs, tables->pcs, tables->pcs_num);
	qmp_pcie_configure(pcs_misc, tables->pcs_misc, tables->pcs_misc_num);

Johan