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Date: Mon, 3 Jul 2023 00:29:41 +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>,
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 6/27/2023 8:01 PM, Johan Hovold wrote:
> On Wed, Jun 21, 2023 at 10:06:24AM +0530, Krishna Kurapati wrote:
>> Add support to read Multiport IRQ's related to quad port controller
>> of SA8295 Device.
>
> Please use a more descriptive summary and commit message; "read" is to
> vague. You're looking up interrupts from the devicetree. Also this
> should not just be about SA8295.
>
>> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
>> ---
>> drivers/usb/dwc3/dwc3-qcom.c | 108 +++++++++++++++++++++++++++++------
>> 1 file changed, 91 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
>> index 3de43df6bbe8..3ab48a6925fe 100644
>> --- a/drivers/usb/dwc3/dwc3-qcom.c
>> +++ b/drivers/usb/dwc3/dwc3-qcom.c
>> @@ -74,9 +74,9 @@ struct dwc3_qcom {
>> struct reset_control *resets;
>>
>> int hs_phy_irq;
>> - int dp_hs_phy_irq;
>> - int dm_hs_phy_irq;
>> - int ss_phy_irq;
>> + int dp_hs_phy_irq[4];
>> + int dm_hs_phy_irq[4];
>> + int ss_phy_irq[2];
>
> As has already been pointed out, you should use a define for these. And
> you already have DWC3_MAX_PORTS.
>
> The driver should not be hardcoding the fact that there are only two SS
> ports on this particular SoC that you're interested in.
>
>> enum usb_device_speed usb2_speed;
>>
>> struct extcon_dev *edev;
>
>> @@ -535,6 +535,80 @@ static int dwc3_qcom_get_irq(struct platform_device *pdev,
>> return ret;
>> }
>>
>> +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...
>
Hi Johan,
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.
Regards,
Krishna,
>> +
>> + 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.
Thanks,
Krishna,
>> +
>> + return 0;
>> +}
>> +
>> static int dwc3_qcom_setup_irq(struct platform_device *pdev)
>> {
>> struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
>> @@ -570,7 +644,7 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
>> dev_err(qcom->dev, "dp_hs_phy_irq failed: %d\n", ret);
>> return ret;
>> }
>> - qcom->dp_hs_phy_irq = irq;
>> + qcom->dp_hs_phy_irq[0] = irq;
>> }
>>
>> irq = dwc3_qcom_get_irq(pdev, "dm_hs_phy_irq",
>> @@ -585,7 +659,7 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
>> dev_err(qcom->dev, "dm_hs_phy_irq failed: %d\n", ret);
>> return ret;
>> }
>> - qcom->dm_hs_phy_irq = irq;
>> + qcom->dm_hs_phy_irq[0] = irq;
>> }
>>
>> irq = dwc3_qcom_get_irq(pdev, "ss_phy_irq",
>> @@ -600,10 +674,10 @@ static int dwc3_qcom_setup_irq(struct platform_device *pdev)
>> dev_err(qcom->dev, "ss_phy_irq failed: %d\n", ret);
>> return ret;
>> }
>> - qcom->ss_phy_irq = irq;
>> + qcom->ss_phy_irq[0] = irq;
>> }
>>
>> - return 0;
>> + return dwc3_qcom_setup_mp_irq(pdev);;
>
> Stray ;
>
>> }
>>
>> static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
>
> Johan
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