[GIT PULL] i.MX fixes for 4.19, round 2

[l.stach@pengutronix.de (Lucas Stach)]

Hi Arnd,

Am Dienstag, den 02.10.2018, 11:59 +0200 schrieb Arnd Bergmann:
> On Mon, Oct 1, 2018 at 4:39 AM Shawn Guo <shawnguo@kernel.org> wrote:
> > 
> > The following changes since commit
> > 57361846b52bc686112da6ca5368d11210796804:
> > 
> >   Linux 4.19-rc2 (2018-09-02 14:37:30 -0700)
> > 
> > are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux.git
> > tags/imx-fixes-4.19-2
> > 
> > for you to fetch changes up to
> > 4d8d4712e47c028306149bda04b79f70325aefb0:
> > 
> >   soc: imx: gpc: set DMA mask for PD platform devices (2018-09-26
> > 10:38:38 +0800)
> > 
> > ----------------------------------------------------------------
> > i.MX fixes for 4.19, round 2:
> >  - There appears an uninitialized DMA mask warning on i.MX GPC
> > driver
> >    with 4.19-rc kernel.  Set the DMA mask for powerdomain platform
> >    device to fix the warning given by device core.
> 
> I don't think this is the right fix, we should generally not just
> make up a dma
> mask pointer.
> 
> Lucas, do you have any more information regarding that warning?
> Are we trying to do DMA on a virtual device? What operation
> causes that warning?

The warning we are silencing here is generated by of_dma_configure() if
the dma_mask is not set, which gets called for all devices with a OF
node, regardless if the device is actually DMA capable.
As the platform bus code calls this function with force_dma = true, the
absent dma-ranges won't stop this function from trying to set up the
dma stuff, so I don't really see another clean way to get rid of this
warning.

Regards,
Lucas