linux-kernel - Re: [PATCH v3 08/15] phy: qcom-qmp-pcie: add register init helper

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Date:   Fri, 28 Oct 2022 18:24:38 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        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>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/15] phy: qcom-qmp-pcie: add register init helper

On 21-10-22, 13:32, Johan Hovold wrote:
> On Fri, Oct 21, 2022 at 02:18:49PM +0300, Dmitry Baryshkov wrote:
> > On 21/10/2022 14:09, 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);
> > 
> > As seem above, if nothing else, tables -> tbls rename generates 
> > unnecessary diff.
> 
> Can you please stop with the bikeshedding. This is not about keeping the
> diff small, this is about readability of the new helper function as I
> already told you.
> 
> And this is a *local* identifier, not some state member that needs a
> super descriptive name. And the rest of the driver used "tbl"
> consistently until your EP/RC mode patches for that matter.

I would disagree here... You can change tbls/tables but then it does not
help _this_ patch

Right thing would be to change tbls to tables first and then add init
helper... For a reviewer seeing an undocumented change and unnecessary
diff is not right..

Pls split if you would still like the rename

-- 
~Vinod