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

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Message-ID: <CADYTM3baomio7+nFizOKFXMav7guow+=GsVaGExBWxQyn9t=2w@mail.gmail.com>
Date:	Wed, 18 Nov 2015 12:29:27 -0600
From:	Bin Liu <binmlist@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	balbi@...com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	George Cherian <george.cherian@...com>,
	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 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.

Thanks,
-Bin.

>
>  config USB_TUSB_OMAP_DMA
>
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