linux-kernel - Re: [PATCH v8 6/9] usb: dwc3: qcom: Add multiport controller support for qcom wrapper

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Date:   Wed, 7 Jun 2023 14:16:36 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, quic_pkondeti@...cinc.com,
        quic_ppratap@...cinc.com, quic_wcheng@...cinc.com,
        quic_jackp@...cinc.com, quic_harshq@...cinc.com,
        ahalaney@...hat.com
Subject: Re: [PATCH v8 6/9] usb: dwc3: qcom: Add multiport controller support
 for qcom wrapper

On Sun, May 14, 2023 at 11:19:14AM +0530, Krishna Kurapati wrote:
> QCOM SoC SA8295P's tertiary quad port controller supports 2 HS+SS
> ports and 2 HS only ports. Add support for configuring PWR_EVENT_IRQ's
> for all the ports during suspend/resume.
> 
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 28 ++++++++++++++++++++++------
>  1 file changed, 22 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index 959fc925ca7c..7a9bce66295d 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -37,7 +37,10 @@
>  #define PIPE3_PHYSTATUS_SW			BIT(3)
>  #define PIPE_UTMI_CLK_DIS			BIT(8)
>  
> -#define PWR_EVNT_IRQ_STAT_REG			0x58
> +#define PWR_EVNT_IRQ1_STAT_REG			0x58
> +#define PWR_EVNT_IRQ2_STAT_REG			0x1dc
> +#define PWR_EVNT_IRQ3_STAT_REG			0x228
> +#define PWR_EVNT_IRQ4_STAT_REG			0x238
>  #define PWR_EVNT_LPM_IN_L2_MASK			BIT(4)
>  #define PWR_EVNT_LPM_OUT_L2_MASK		BIT(5)
>  
> @@ -93,6 +96,13 @@ struct dwc3_qcom {
>  	struct icc_path		*icc_path_apps;
>  };
>  
> +static u32 pwr_evnt_irq_stat_reg_offset[4] = {
> +			PWR_EVNT_IRQ1_STAT_REG,
> +			PWR_EVNT_IRQ2_STAT_REG,
> +			PWR_EVNT_IRQ3_STAT_REG,
> +			PWR_EVNT_IRQ4_STAT_REG,
> +};

Indentation is off, as I believe Bjorn pointed out.

>  static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
>  {
>  	u32 reg;
> @@ -413,13 +423,16 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup)
>  {
>  	u32 val;
>  	int i, ret;
> +	struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
>  
>  	if (qcom->is_suspended)
>  		return 0;
>  
> -	val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
> -	if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
> -		dev_err(qcom->dev, "HS-PHY not in L2\n");
> +	for (i = 0; i < dwc->num_usb2_ports; i++) {
> +		val = readl(qcom->qscratch_base + pwr_evnt_irq_stat_reg_offset[i]);
> +		if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
> +			dev_err(qcom->dev, "HS-PHY%d not in L2\n", i);
> +	}

You need check for NULL dwc as we just discussed and skip the above
check if core has not probed yet.

When testing this on the X13s I get:

	dwc3-qcom a4f8800.usb: HS-PHY2 not in L2

for the third port, whose status registers always seems to return zero
(e.g. as if we're checking the wrong register?):

dwc3-qcom a4f8800.usb: dwc3_qcom_suspend - phy 0, pwr_event_stat = 38103c
dwc3-qcom a4f8800.usb: dwc3_qcom_suspend - phy 1, pwr_event_stat = 38103c
dwc3-qcom a4f8800.usb: dwc3_qcom_suspend - phy 2, pwr_event_stat = 00
dwc3-qcom a4f8800.usb: dwc3_qcom_suspend - phy 3, pwr_event_stat = 140030

I verified that everything appears to work as expected on sa8295p-adp.

Do you have any idea of what may be causing this?

Johan