linux-kernel - Re: [PATCH] usb: musb: USB_TI_CPPI41

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Message-ID: <CADYTM3Ye=7iydzeg2j3VNkiHVoZqE6Hasm6N6=2UNiHEr2Ti4g@mail.gmail.com>
Date:	Wed, 18 Nov 2015 14:20:57 -0600
From:	Bin Liu <binmlist@...il.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support

Hi,

On Wed, Nov 18, 2015 at 1:27 PM, Felipe Balbi <balbi@...com> wrote:
>
> Hi,
>
> Bin Liu <binmlist@...il.com> writes:
>> On Wed, Nov 18, 2015 at 10:18 AM, Arnd Bergmann <arnd@...db.de> wrote:
>>> The CPPI-4.1 driver selects TI_CPPI41, which is a dmaengine
>>> driver and that may not be available when CONFIG_DMADEVICES
>>> is not set:
>>>
>>> warning: (USB_TI_CPPI41_DMA) selects TI_CPPI41 which has unmet direct dependencies (DMADEVICES && ARCH_OMAP)
>>>
>>> This adds an extra dependency to avoid generating warnings in randconfig
>>> builds. Ideally we'd remove the 'select' statement, but that has the
>>> potential to break defconfig files.
>>>
>>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>>> Fixes: 411dd19c682d ("usb: musb: Kconfig: Select the DMA driver if DMA mode of MUSB is enabled")
>>>
>>> diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
>>> index 1f2037bbeb0d..45c83baf675d 100644
>>> --- a/drivers/usb/musb/Kconfig
>>> +++ b/drivers/usb/musb/Kconfig
>>> @@ -159,7 +159,7 @@ config USB_TI_CPPI_DMA
>>>
>>>  config USB_TI_CPPI41_DMA
>>>         bool 'TI CPPI 4.1 (AM335x)'
>>> -       depends on ARCH_OMAP
>>> +       depends on ARCH_OMAP && DMADEVICES
>>>         select TI_CPPI41
>>
>> I am not sure what the generic policy is, but instead of hiding
>> USB_TI_CPPI41_DMA if DMADEVICES is disabled, I'd like to enable
>> DMADEVICES if USB_TI_CPPI41_DMA is enabled, from user experience
>> perspective.
>
> that would mean "select DMADEVICES" and that's frowned upon.

Currently 'select DMADEVICES' is not in there. Will adding it fix the
dependency warning in randconfig? Sorry for the question, but I don't
know enough about Kconfig to get the answer.

Regards,
-Bin.

>
> --
> balbi
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