[PATCH 1/1] mmc: host: enable OMAP DMA engine support for omap hosts by default

[Shilimkar, Santosh]

On Fri, Aug 24, 2012 at 3:12 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
>
> On Fri, Aug 24, 2012 at 09:51:15AM +0200, Peter Meerwald wrote:
> > the commit just sets CONFIG_DMA_OMAP=y and CONFIG_DMADEVICES=y in
> > omap2plus_defconfig; this does not help people updating the kernel while
> > keeping the config, nor does it help people in configuring the kernel
> >
> > there is a dependency (at least for beagleboard) between MMC_OMAP_HS and
> > DMA_OMAP, and I think this should be made explicit
>
> Well, this is where stuff starts to get really yucky, because that
> means if you have DMA_OMAP as a module, you have to have MMC_OMAP_HS
> as a module too.  Or vice versa.  Which is a real pain for further
> development of DMA_OMAP.
>
> Whatever, the solution here is NOT to add select statements to the
> Kconfig to force DMA engine support and DMA_OMAP to 'y' for OMAP.
> The best solution is for MMC_OMAP_HS to depend on DMA_OMAP, but that
> will just mean that you'll end up with MMC_OMAP_HS disabled in your
> config witout DMA engine support.  Another less desirable solution
> is to have MMC_OMAP_HS select DMA engine and DMA_OMAP.

Part of the patch [1] does the last part.
MMC_OMAP_HS select DMA engine and DMA_OMAP.

Regards
Santosh

[1] https://patchwork.kernel.org/patch/1203391/