linux-kernel - Re: [PATCH v2 5/7] usb: dwc3: qcom: Don't reply on drvdata during probe

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Message-ID: <ZrujhBR01MCs3iYE@lizhi-Precision-Tower-5810>
Date: Tue, 13 Aug 2024 14:18:44 -0400
From: Frank Li <Frank.li@....com>
To: Bjorn Andersson <andersson@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>,
	Wesley Cheng <quic_wcheng@...cinc.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Konrad Dybcio <konrad.dybcio@...aro.org>, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Bjorn Andersson <quic_bjorande@...cinc.com>
Subject: Re: [PATCH v2 5/7] usb: dwc3: qcom: Don't reply on drvdata during
 probe

On Sun, Aug 11, 2024 at 08:12:02PM -0700, Bjorn Andersson wrote:
> From: Bjorn Andersson <quic_bjorande@...cinc.com>
>
> With the upcoming transition to a model where DWC3 core and glue operate
> on a single struct device the drvdata datatype will change to be owned
> by the core.
>
> The drvdata is however used by the Qualcomm DWC3 glue to pass the qcom
> glue context around before the core is allocated.
>
> Remove this problem, and clean up the code, by passing the dwc3_qcom
> struct around during probe, instead of acquiring it from the drvdata.
>
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 17 ++++++++---------
>  1 file changed, 8 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 88fb6706a18d..33de03f2d782 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -546,9 +546,10 @@ static int dwc3_qcom_request_irq(struct dwc3_qcom *qcom, int irq,
>  	return ret;
>  }
>
> -static int dwc3_qcom_setup_port_irq(struct platform_device *pdev, int port_index, bool is_multiport)
> +static int dwc3_qcom_setup_port_irq(struct dwc3_qcom *qcom,

If pass "qcom", do you need "pdev"? generaly, qcom should have pdev information.

Frank
> +				    struct platform_device *pdev,
> +				    int port_index, bool is_multiport)
>  {
> -	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>  	const char *irq_name;
>  	int irq;
>  	int ret;
> @@ -633,9 +634,8 @@ static int dwc3_qcom_find_num_ports(struct platform_device *pdev)
>  	return DWC3_QCOM_MAX_PORTS;
>  }
>
> -static int dwc3_qcom_setup_irq(struct platform_device *pdev)
> +static int dwc3_qcom_setup_irq(struct dwc3_qcom *qcom, struct platform_device *pdev)
>  {
> -	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>  	bool is_multiport;
>  	int ret;
>  	int i;
> @@ -644,7 +644,7 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
>  	is_multiport = (qcom->num_ports > 1);
>
>  	for (i = 0; i < qcom->num_ports; i++) {
> -		ret = dwc3_qcom_setup_port_irq(pdev, i, is_multiport);
> +		ret = dwc3_qcom_setup_port_irq(qcom, pdev, i, is_multiport);
>  		if (ret)
>  			return ret;
>  	}
> @@ -699,9 +699,8 @@ static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
>  	return 0;
>  }
>
> -static int dwc3_qcom_of_register_core(struct platform_device *pdev)
> +static int dwc3_qcom_of_register_core(struct dwc3_qcom *qcom, struct platform_device *pdev)
>  {
> -	struct dwc3_qcom	*qcom = platform_get_drvdata(pdev);
>  	struct device_node	*np = pdev->dev.of_node, *dwc3_np;
>  	struct device		*dev = &pdev->dev;
>  	int			ret;
> @@ -782,7 +781,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  		goto clk_disable;
>  	}
>
> -	ret = dwc3_qcom_setup_irq(pdev);
> +	ret = dwc3_qcom_setup_irq(qcom, pdev);
>  	if (ret) {
>  		dev_err(dev, "failed to setup IRQs, err=%d\n", ret);
>  		goto clk_disable;
> @@ -797,7 +796,7 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
>  	if (ignore_pipe_clk)
>  		dwc3_qcom_select_utmi_clk(qcom);
>
> -	ret = dwc3_qcom_of_register_core(pdev);
> +	ret = dwc3_qcom_of_register_core(qcom, pdev);
>  	if (ret) {
>  		dev_err(dev, "failed to register DWC3 Core, err=%d\n", ret);
>  		goto clk_disable;
>
> --
> 2.45.2
>