linux-kernel - Re: [PATCH v8 08/11] phy: qcom-qmp-pcie: Add support for SM8550 g3x2 and g4x2 PCIEs

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Message-ID: <Y+PSR6DKUeoreGJL@hovoldconsulting.com>
Date:   Wed, 8 Feb 2023 17:48:07 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v8 08/11] phy: qcom-qmp-pcie: Add support for SM8550 g3x2
 and g4x2 PCIEs

On Mon, Feb 06, 2023 at 11:26:16PM +0200, Abel Vesa wrote:
> Add the SM8550 both g4 and g3 configurations. In addition, there is a
> new "lane shared" table that needs to be configured for g4, along with
> the No-CSR list of resets. The no-CSR allows resetting the PHY without
> actually dropping the PHY configuration. The no-CSR needs to be
> deasserted only after the PHY has been configured and the PLL has
> stabilized.
> 
> Co-developed-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---

> @@ -2370,6 +2690,12 @@ static int qmp_pcie_power_on(struct phy *phy)
>  	if (ret)
>  		return ret;
>  
> +	ret = reset_control_deassert(qmp->nocsr_reset);
> +	if (ret) {
> +		dev_err(qmp->dev, "no-csr reset deassert failed\n");
> +		goto err_disable_pipe_clk;
> +	}
> +
>  	/* Pull PHY out of reset state */
>  	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>  
> @@ -2503,6 +2829,13 @@ static int qmp_pcie_reset_init(struct qmp_pcie *qmp)
>  	if (ret)
>  		return dev_err_probe(dev, ret, "failed to get resets\n");
>  
> +	if (cfg->has_nocsr_reset) {
> +		qmp->nocsr_reset = devm_reset_control_get_exclusive(dev, "phy_nocsr");
> +		if (IS_ERR(qmp->nocsr_reset))
> +			return dev_err_probe(dev, PTR_ERR(qmp->nocsr_reset),
> +						"failed to get no-CSR reset\n");

Nit: You're still using uppercase CSR here and lowercase elsewhere.

> +	}
> +
>  	return 0;
>  }

Reviewed-by: Johan Hovold <johan+linaro@...nel.org>