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Subject: Re: [PATCH v7 2/4] usb: dwc3: qcom: Add interconnect support in dwc3
 driver
To:     Felipe Balbi <balbi@kernel.org>,
        Matthias Kaehlcke <mka@chromium.org>
Cc:     Sandeep Maheswaram <sanm@codeaurora.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Stephen Boyd <swboyd@chromium.org>,
        Doug Anderson <dianders@chromium.org>,
        linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Manu Gautam <mgautam@codeaurora.org>,
        Chandana Kishori Chiluveru <cchiluve@codeaurora.org>,
        Viresh Kumar <viresh.kumar@linaro.org>
References: <1585718145-29537-1-git-send-email-sanm@codeaurora.org>
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 <878shu4uwk.fsf@kernel.org> <875zcy4uuj.fsf@kernel.org>
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 <abbc3f8c-c8c9-c189-735e-f8058dab3e40@linaro.org> <87tv0h3fpv.fsf@kernel.org>
From:   Georgi Djakov <georgi.djakov@linaro.org>
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Message-ID: <090e48d7-7988-eea1-bf39-f6820578d354@linaro.org>
Date:   Fri, 15 May 2020 09:11:18 +0300
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Hi,

On 5/15/20 08:54, Felipe Balbi wrote:
> 
> Hi,
> 
> Georgi Djakov <georgi.djakov@linaro.org> writes:
>> On 5/14/20 20:13, Matthias Kaehlcke wrote:
>>> On Thu, May 14, 2020 at 02:30:28PM +0300, Felipe Balbi wrote:
>>>> Felipe Balbi <balbi@kernel.org> writes:
>>>>
>>>>> Hi,
>>>>>
>>>>> Sandeep Maheswaram <sanm@codeaurora.org> writes:
>>>>>> +static int dwc3_qcom_interconnect_init(struct dwc3_qcom *qcom)
>>>>>> +{
>>>>>> +	struct device *dev = qcom->dev;
>>>>>> +	int ret;
>>>>>> +
>>>>>> +	if (!device_is_bound(&qcom->dwc3->dev))
>>>>>> +		return -EPROBE_DEFER;
>>>>>
>>>>> this breaks allmodconfig. I'm dropping this series from my queue for
>>>>> this merge window.
>>>>
>>>> Sorry, I meant this patch ;-)
>>>
>>> I guess that's due to INTERCONNECT being a module. There is currently a
>>
>> I believe it's because of this:
>> ERROR: modpost: "device_is_bound" [drivers/usb/dwc3/dwc3-qcom.ko] undefined!
>>
>>> discussion about this  with Viresh and Georgi in response to another
>>> automated build failure. Viresh suggests changing CONFIG_INTERCONNECT
>>> from tristate to bool, which seems sensible to me given that interconnect
>>> is a core subsystem.
>>
>> The problem you are talking about would arise when INTERCONNECT=m and
>> USB_DWC3_QCOM=y and it definitely exists here and could be triggered with
>> randconfig build. So i suggest to squash also the diff below.
>>
>> Thanks,
>> Georgi
>>
>> ---8<---
>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
>> index 206caa0ea1c6..6661788b1a76 100644
>> --- a/drivers/usb/dwc3/Kconfig
>> +++ b/drivers/usb/dwc3/Kconfig
>> @@ -129,6 +129,7 @@ config USB_DWC3_QCOM
>>  	tristate "Qualcomm Platform"
>>  	depends on ARCH_QCOM || COMPILE_TEST
>>  	depends on EXTCON || !EXTCON
>> +	depends on INTERCONNECT || !INTERCONNECT
> 
> I would prefer to see a patch adding EXPORT_SYMBOL_GPL() to device_is_bound()

Agree, but just to clarify, that these are two separate issues that need to
be fixed. The device_is_bound() is the first one and USB_DWC3_QCOM=y combined
with INTERCONNECT=m is the second one.

Thanks,
Georgi