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

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Date:   Fri, 11 Aug 2023 18:48:16 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>,
        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>,
        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 21.07.2023 14:54, Johan Hovold wrote:
> On Fri, Jul 21, 2023 at 02:10:07PM +0200, Konrad Dybcio wrote:
>> On 21.07.2023 13:16, Johan Hovold wrote:
>>> On Fri, Jul 14, 2023 at 04:08:45PM +0530, Krishna Kurapati PSSNV wrote:
>>>> 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
> 
>> Sidenote, I get this on any Qcom device on any platform I try
>> to enter suspend on, without these MP patches.
> 
> Ok, that might provide some hint. But on sc8280xp (X13s) we only get it
> on one of the four MP ports (i.e. on one out of six ports in total).
> 
> While on sa8295p-adp there are no such errors on any port.
I've been playing with 8450 and it looks like snps,dis_u2_susphy_quirk
causes this error.

The downstream tree contains this property and I'm inclined to believe
it means that this platforms should define it (as the devicetrees are
machine-generated to a degree, AFAIK), especially since this quirk does
the exact same thing on a known-working downstream, namely unsetting
DWC3_GUSB2PHYCFG_SUSPHY.

Digging a bit deeper, dwc3-msm-core [1], the downstream version of dwc3-qcom
performs a bit of a dance in a couple of places.. Look for that register name.

Unfortunately I have little idea what the "USB2 suspend phy" is.. is it a PHY
used in suspend? Is it the suspension of the USB2 PHY? No clue.

[1] https://git.codelinaro.org/clo/la/kernel/msm-5.10/-/blob/KERNEL.PLATFORM.1.0.r2-08800-WAIPIOLE.0/drivers/usb/dwc3/dwc3-msm-core.c

Konrad