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

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Message-ID: <932765e0-ecbc-8c9b-69c5-ce0bb0c8de68@linaro.org>
Date:   Fri, 21 Oct 2022 14:18:49 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     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 21/10/2022 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.
Other than that LGTM.

>   }
>   
>   static int qmp_pcie_init(struct phy *phy)
> @@ -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);
>   
>   	ret = clk_prepare_enable(qmp->pipe_clk);
>   	if (ret) {
> @@ -1941,13 +1927,6 @@ static int qmp_pcie_power_on(struct phy *phy)
>   		return ret;
>   	}
>   
> -	/* Tx, Rx, and PCS configurations */
> -	qmp_pcie_lanes_init(qmp, &cfg->tables);
> -	qmp_pcie_lanes_init(qmp, mode_tables);
> -
> -	qmp_pcie_pcs_init(qmp, &cfg->tables);
> -	qmp_pcie_pcs_init(qmp, mode_tables);
> -
>   	/* Pull PHY out of reset state */
>   	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>   

-- 
With best wishes
Dmitry