linux-kernel - Re: [PATCH v2] PCI: qcom: Fix pipe clock imbalance

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Date:   Mon, 4 Apr 2022 06:53:16 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Andy Gross <agross@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Wilczy??ski <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] PCI: qcom: Fix pipe clock imbalance

On Fri 01 Apr 06:33 PDT 2022, Johan Hovold wrote:

> Commit ed8cc3b1fc84 ("PCI: qcom: Add support for SDM845 PCIe
> controller") introduced a clock imbalance by enabling the pipe clock
> both in init() and in post_init() but only disabling in post_deinit().
> 
> Note that the pipe clock was also never disabled in the init() error
> paths and that enabling the clock before powering up the PHY looks
> questionable.
> 
> Fixes: ed8cc3b1fc84 ("PCI: qcom: Add support for SDM845 PCIe controller")
> Cc: stable@...r.kernel.org      # 5.6
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
> 
> Changes in v2
>  - Capitalise "Fix" in subject line according to PCI subsystem
>    convention
> 
> 
>  drivers/pci/controller/dwc/pcie-qcom.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index b79d98e5e228..20a0e6533a1c 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1238,12 +1238,6 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie)
>  		goto err_disable_clocks;
>  	}
>  
> -	ret = clk_prepare_enable(res->pipe_clk);
> -	if (ret) {
> -		dev_err(dev, "cannot prepare/enable pipe clock\n");
> -		goto err_disable_clocks;
> -	}
> -
>  	/* Wait for reset to complete, required on SM8450 */
>  	usleep_range(1000, 1500);
>  
> -- 
> 2.35.1
>