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

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Date:	Wed, 18 Nov 2015 13:27:32 -0600
From:	Felipe Balbi <balbi@...com>
To:	Bin Liu <binmlist@...il.com>, Arnd Bergmann <arnd@...db.de>
CC:	<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,

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.

-- 
balbi

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