linux-kernel - Re: [PATCH v8 4/4] PCI: qcom: Switch pcie_1_pipe_clk

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Date:   Mon, 20 Sep 2021 12:53:41 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Prasad Malisetty <pmaliset@...eaurora.org>, agross@...nel.org,
        bhelgaas@...gle.com, bjorn.andersson@...aro.org,
        lorenzo.pieralisi@....com, robh+dt@...nel.org, svarbanov@...sol.com
Cc:     devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, mka@...omium.org, vbadigan@...eaurora.org,
        sallenki@...eaurora.org, manivannan.sadhasivam@...aro.org
Subject: Re: [PATCH v8 4/4] PCI: qcom: Switch pcie_1_pipe_clk_src after PHY
 init in SC7280

Quoting Prasad Malisetty (2021-09-17 10:15:47)
> On the SC7280, the clock source for gcc_pcie_1_pipe_clk_src
> must be the TCXO while gdsc is enabled. After PHY init successful
> clock source should switch to pipe clock for gcc_pcie_1_pipe_clk_src.
>
> Signed-off-by: Prasad Malisetty <pmaliset@...eaurora.org>
> ---

One nit below

Reviewed-by: Stephen Boyd <swboyd@...omium.org>

> @@ -1488,7 +1553,9 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>
>         pcie->pci = pci;
>
> -       pcie->ops = of_device_get_match_data(dev);
> +       pcie_cfg = of_device_get_match_data(dev);
> +       pcie->ops = pcie_cfg->ops;

Maybe worth failing probe with if (!pcie->ops) just to be a little
nicer here.

> +       pcie->pipe_clk_need_muxing = pcie_cfg->pipe_clk_need_muxing;
>
>         pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH);
>         if (IS_ERR(pcie->reset)) {