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

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Date:   Fri, 14 Jul 2023 16:08:45 +0530
From:   Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To:     Johan Hovold <johan@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Jack Pham <quic_jackp@...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>, <ahalaney@...hat.com>
Subject: Re: [PATCH v8 6/9] usb: dwc3: qcom: Add multiport controller support
 for qcom wrapper



On 7/14/2023 2:30 PM, Johan Hovold wrote:
> On Mon, Jul 03, 2023 at 12:35:48AM +0530, Krishna Kurapati PSSNV wrote:
>> On 6/27/2023 9:13 PM, Johan Hovold wrote:
>>> 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:
> 
>>>>> -	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?
> 
>>    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.
> 
> Did you hear anything back regarding the above?
> 
> Could it even be that the register offset it not correct for sc8280xp?
>

Hi Johan,

No. I rechecked the register offsets and they are proper. (same as what 
we are using in downstream).

Adding Jack and Wesley to help with any suggestions here.

Regards,
Krishna,