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Date:   Tue, 27 Jun 2023 17:43:34 +0200
From:   Johan Hovold <johan@kernel.org>
To:     Krishna Kurapati <quic_kriskura@quicinc.com>
Cc:     Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Felipe Balbi <balbi@kernel.org>, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        devicetree@vger.kernel.org, quic_pkondeti@quicinc.com,
        quic_ppratap@quicinc.com, quic_wcheng@quicinc.com,
        quic_jackp@quicinc.com, quic_harshq@quicinc.com,
        ahalaney@redhat.com
Subject: Re: [PATCH v8 6/9] usb: dwc3: qcom: Add multiport controller support
 for qcom wrapper
Message-ID: <ZJsDpqttBYtbQ0yg@hovoldconsulting.com>
References: <20230514054917.21318-1-quic_kriskura@quicinc.com>
 <20230514054917.21318-7-quic_kriskura@quicinc.com>
 <ZIB1JEmLCw41v_4e@hovoldconsulting.com>
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In-Reply-To: <ZIB1JEmLCw41v_4e@hovoldconsulting.com>
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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