linux-kernel - Re: [PATCH v18 2/9] usb: dwc3: core: Access XHCI address space temporarily to read port info

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Date: Wed, 3 Apr 2024 13:03:21 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Johan Hovold <johan@...nel.org>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh@...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>, "Felipe
 Balbi" <balbi@...nel.org>,
        "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org"
	<linux-arm-msm@...r.kernel.org>,
        "linux-usb@...r.kernel.org"
	<linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>,
        "quic_ppratap@...cinc.com"
	<quic_ppratap@...cinc.com>,
        "quic_jackp@...cinc.com"
	<quic_jackp@...cinc.com>,
        Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH v18 2/9] usb: dwc3: core: Access XHCI address space
 temporarily to read port info



On 4/3/2024 12:36 PM, Johan Hovold wrote:
> On Wed, Apr 03, 2024 at 10:54:25AM +0530, Krishna Kurapati PSSNV wrote:
>   
>>>> +static int dwc3_read_port_info(struct dwc3 *dwc)
>>>> +{
>>>> +	void __iomem *base;
>>>> +	u8 major_revision;
>>>> +	u32 offset;
>>>> +	u32 val;
>>>> +
>>>> +	/*
>>>> +	 * Remap xHCI address space to access XHCI ext cap regs since it is
>>>> +	 * needed to get information on number of ports present.
>>>> +	 */
>>>> +	base = ioremap(dwc->xhci_resources[0].start,
>>>> +		       resource_size(&dwc->xhci_resources[0]));
>>>> +	if (IS_ERR(base))
>>>> +		return PTR_ERR(base);
>>>
>>> Looks like you forgot to address some of the comments you said you'd
>>> update previously if you submit a new version to the series.
>>>
>>> [*] https://lore.kernel.org/linux-usb/af73110d-e13e-4183-af11-aed869ac0a31@quicinc.com/
>>>
>>
>> Apologies. I agree. I was too much focused on acpi removal and interrupt
>> cleanup, I forgot the last comment you gave.
>>
>> Can I send in a separate patch for this ?
> 
> The series has not been merged yet so you can address both issues in a
> v19. Perhaps wait a day or two in case Thinh has further comments.
> 

Sure Johan.

Also after making the following two changes:

1. Rename dwc3_read_port_info(...) to dwc3_get_num_ports(...)
2. Changing "if (IS_ERR(base))" to "if (!base)"

Can I still retain your RB tag ?

Regards,
Krishna,