linux-kernel - Re: [PATCH v16 7/9] usb: dwc3: qcom: Refactor IRQ handling in glue driver

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Date: Tue, 26 Mar 2024 15:36:27 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Johan Hovold <johan@...nel.org>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Wesley Cheng
	<quic_wcheng@...cinc.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Greg
 Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Felipe Balbi
	<balbi@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_ppratap@...cinc.com>,
        <quic_jackp@...cinc.com>
Subject: Re: [PATCH v16 7/9] usb: dwc3: qcom: Refactor IRQ handling in glue
 driver



On 3/26/2024 1:58 PM, Johan Hovold wrote:
> On Tue, Mar 26, 2024 at 01:41:52PM +0530, Krishna Kurapati PSSNV wrote:
>> On 3/26/2024 1:15 AM, Johan Hovold wrote:
>>
>>> Just change the logic in dwc3_qcom_find_num_ports() so that it returns 1
>>> if "dp_hs_phy_1" is missing, and otherwise you determine the number of
>>> ports by iterating from 2 to DWC3_MAX_PORTS - 1.
> 
>> I made this change and it works. Removed any return value check for the
>> find_num_ports call as it can return only 1/2/3/4 now.
>>
>> ---
>>       irq = platform_get_irq_byname_optional(pdev, "qusb2_phy");
>>           if (irq > 0)
>>                   return 1;
>>
>>           irq = platform_get_irq_byname_optional(pdev, "dp_hs_phy_irq");
>>           if (irq > 0)
>>                   return 1;
> 
> As I mentioned above, these two lookups are no longer needed and should
> be removed.
>   
>>           irq = platform_get_irq_byname_optional(pdev, "dp_hs_phy_1");
>>           if (irq <= 0)
>>                   return 1;
> 
> Just assume it's a single port controller unless "dp_hs_phy_1" is
> present.
>   
>>           for (port_index = 1; port_index < DWC3_MAX_PORTS - 1;
>> port_index++) {
> 
> I think this would be more readable if you use port (num) as iterator
> (2..DWC3_MAX_PORTS) as you're returning a number of ports.
> 
>>                   sprintf(irq_name, "dp_hs_phy_%d", port_index + 1);
> 
> Then this would use just "port";
> 
>>
>>                   irq = platform_get_irq_byname_optional(pdev, irq_name);
>>                   if (irq <= 0)
>>                           return port_index;
> 
> And return "port - 1" here.
> 
>>           }
>>
>>           return DWC3_MAX_PORTS;

Ok,Thanks.

With the above fixed, can I put your RB tag given on [1] or will you be 
providing another one. Asking because when you gave that RB, this 
malformed DT thing wasn't there. So wanted to check with you before 
pushing the code.

[1]: https://lore.kernel.org/all/ZgFyukBXIIwZo7v-@hovoldconsulting.com/

Regards,
Krishna,