linux-kernel - Re: [PATCH v9 06/10] usb: dwc3: qcom: Add support to read IRQ's related to multiport

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Message-ID: <ZLo-feuIr2FzCoxa@hovoldconsulting.com>
Date:   Fri, 21 Jul 2023 10:14:53 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Krishna Kurapati PSSNV <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>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        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_jackp@...cinc.com, quic_harshq@...cinc.com,
        ahalaney@...hat.com, quic_shazhuss@...cinc.com
Subject: Re: [PATCH v9 06/10] usb: dwc3: qcom: Add support to read IRQ's
 related to multiport

On Mon, Jul 03, 2023 at 12:29:41AM +0530, Krishna Kurapati PSSNV wrote:
> On 6/27/2023 8:01 PM, Johan Hovold wrote:
> > On Wed, Jun 21, 2023 at 10:06:24AM +0530, Krishna Kurapati wrote:
  
> >> +static int dwc3_qcom_setup_mp_irq(struct platform_device *pdev)
> >> +{
> >> +	struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
> >> +	char irq_name[15];
> >> +	int irq;
> >> +	int ret;
> >> +	int i;
> >> +
> >> +	for (i = 0; i < 4; i++) {
> > 
> > DWC3_MAX_PORTS here too and similar below.
> > 
> >> +		if (qcom->dp_hs_phy_irq[i])
> >> +			continue;
> > 
> > This is not very nice. You should try to integrate the current lookup
> > code as I told you to do with the PHY lookups. That is, use a single
> > loop for all HS/SS IRQs, and pick the legacy name if the number of ports
> > is 1.
> > 
> > Of course, you added the xhci capability parsing to the core driver so
> > that information is not yet available, but you need it in the glue
> > driver also...
> > 
> > As I mentioned earlier, you can infer the number of ports from the
> > interrupt names. Alternatively, you can infer it from the compatible
> > string. In any case, you should not need to ways to determine the same
> > information in the glue driver, then in the core part, and then yet
> > again in the xhci driver...

>   The reason why I didn't integrate this with the original function was 
> the ACPI stuff. The MP devices have no ACPI variant. And I think for 
> clarity sake its best to keep these two functions separated.

No. The ACPI stuff may make this a little harder to implement, but
that's not a sufficient reason to not try to refactor things properly.

> >> +
> >> +		sprintf(irq_name, "dp%d_hs_phy_irq", i+1);
> > 
> > Spaces around binary operators. Does not checkpatch warn about that?
> > 
> >> +		irq = dwc3_qcom_get_irq(pdev, irq_name, -1);
> >> +		if (irq > 0) {
> >> +			irq_set_status_flags(irq, IRQ_NOAUTOEN);
> >> +			ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
> >> +					qcom_dwc3_resume_irq,
> >> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> >> +					irq_name, qcom);
> >> +			if (ret) {
> >> +				dev_err(qcom->dev, "%s failed: %d\n", irq_name, ret);
> >> +				return ret;
> >> +			}
> >> +		}
> >> +
> >> +		qcom->dp_hs_phy_irq[i] = irq;
> >> +	}
> >> +
> >> +	for (i = 0; i < 4; i++) {
> >> +		if (qcom->dm_hs_phy_irq[i])
> >> +			continue;
> >> +
> >> +		sprintf(irq_name, "dm%d_hs_phy_irq", i+1);
> >> +		irq = dwc3_qcom_get_irq(pdev, irq_name, -1);
> >> +		if (irq > 0) {
> >> +			irq_set_status_flags(irq, IRQ_NOAUTOEN);
> >> +			ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
> >> +					qcom_dwc3_resume_irq,
> >> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> >> +					irq_name, qcom);
> >> +			if (ret) {
> >> +				dev_err(qcom->dev, "%s failed: %d\n", irq_name, ret);
> >> +				return ret;
> >> +			}
> >> +		}
> >> +
> >> +		qcom->dm_hs_phy_irq[i] = irq;
> >> +	}
> >> +
> >> +	for (i = 0; i < 2; i++) {
> >> +		if (qcom->ss_phy_irq[i])
> >> +			continue;
> >> +
> >> +		sprintf(irq_name, "ss%d_phy_irq", i+1);
> >> +		irq = dwc3_qcom_get_irq(pdev, irq_name, -1);
> >> +		if (irq > 0) {
> >> +			irq_set_status_flags(irq, IRQ_NOAUTOEN);
> >> +			ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
> >> +					qcom_dwc3_resume_irq,
> >> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> >> +					irq_name, qcom);
> >> +			if (ret) {
> >> +				dev_err(qcom->dev, "%s failed: %d\n", irq_name, ret);
> >> +				return ret;
> >> +			}
> >> +		}
> >> +
> >> +		qcom->ss_phy_irq[i] = irq;
> >> +	}
> > 
> > So the above should all be merged in either a single helper looking up
> > all the interrupts for a port and resused for the non-MP case.
> > 
> I agree, Will merge all under some common helper function.

Good.

Johan