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

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Message-ID: <26ae15d1-4e13-3ab7-6844-3a7d3ed03af4@quicinc.com>
Date:   Mon, 3 Jul 2023 00:35:48 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Johan Hovold <johan@...nel.org>
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>, <ahalaney@...hat.com>
Subject: Re: [PATCH v8 6/9] usb: dwc3: qcom: Add multiport controller support
 for qcom wrapper



On 6/27/2023 9:13 PM, Johan Hovold wrote:
> Hi Krishna,
> 
> On Wed, Jun 07, 2023 at 02:16:37PM +0200, Johan Hovold wrote:
>> On Sun, May 14, 2023 at 11:19:14AM +0530, Krishna Kurapati wrote:
> 
>>>   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);
>>> +	}
> 
>> 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?
> 
> You never replied to this; do you have any idea why the status register
> for the second port seemingly always read back as 0 on the X13s?
> 
> Johan

Hi Johan,

  Missed this mail. This never popped up on my system. So no idea what 
is different in Lenovo X13s. Might need to check with team internally.

Regards,
Krishna,