linux-kernel - Re: [PATCH] dma: remove bad_dma

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Date:	Mon, 13 Jun 2016 11:51:08 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Simran Rai <ssimran@...adcom.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] dma: remove bad_dma_ops to fix build fail

On Mon, Jun 13, 2016 at 10:29:34AM +0100, Mark Brown wrote:
> On Mon, Jun 13, 2016 at 08:41:12AM +0100, Sudip Mukherjee wrote:
> > On Sun, Jun 12, 2016 at 02:32:24PM -0700, Jerry Snitselaar wrote:
> 
> > > config SND_SOC_CYGNUS
> > > 	tristate "SoC platform audio for Broadcom Cygnus chips"
> > > 	depends on ARCH_BCM_CYGNUS || COMPILE_TEST
> > > +	depends on HAS_DMA
> > > 	help
> > > 	  Say Y if you want to add support for ASoC audio on Broadcom
> > > 	  Cygnus chips (bcm958300, bcm958305, bcm911360)
> 
> > well, I have been doing the exact same thing for all the drivers that was
> > failing to build but in my last patch Mark suggested to have stub
> > implementation in the arch [1]. So while looking for that I noticed
> > bad_dma_ops is not defined by anyone. So what will you suggest?
> 
> Right, we've got a couple of obscure architectures with no DMA support
> which are leading to a constant stream of patches like this that are
> being triggered by compile coverage stuff.  In situations like this we
> very often provide stubs rather than having to handle this in lots of
> different places in the code.

Ok, I will do that. But I am seeing arch/m32r/include/asm/m32102.h is
defining the DMA Controller registers and also a MAX_DMA_ADDRESS is
defined in dma.h. Doesn't that mean that this arch is capable of DMA?

Regards
Sudip