linux-kernel - Re: [PATCH 1/2] usb: dwc3: qcom: only parse 'maximum-speed' once

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Date:   Fri, 5 Aug 2022 15:34:51 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb: dwc3: qcom: only parse 'maximum-speed' once

On Fri, Aug 05, 2022 at 09:44:59AM +0200, Johan Hovold wrote:
> Add a temporary variable to the interconnect-initialisation helper to
> avoid parsing and decoding the 'maximum-speed' devicetree property
> twice.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 6814861bed6c..196efa9f2545 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -243,6 +243,7 @@ static int dwc3_qcom_interconnect_disable(struct dwc3_qcom *qcom)
>   */
>  static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
>  {
> +	enum usb_device_speed max_speed;
>  	struct device *dev = qcom->dev;
>  	int ret;
>  
> @@ -263,8 +264,8 @@ static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
>  		return PTR_ERR(qcom->icc_path_apps);
>  	}
>  
> -	if (usb_get_maximum_speed(&qcom->dwc3->dev) >= USB_SPEED_SUPER ||
> -			usb_get_maximum_speed(&qcom->dwc3->dev) == USB_SPEED_UNKNOWN)
> +	max_speed = usb_get_maximum_speed(&qcom->dwc3->dev);
> +	if (max_speed >= USB_SPEED_SUPER || max_speed == USB_SPEED_UNKNOWN)
>  		ret = icc_set_bw(qcom->icc_path_ddr,
>  			USB_MEMORY_AVG_SS_BW, USB_MEMORY_PEAK_SS_BW);
>  	else
> -- 
> 2.35.1
>