[U-Boot] [PATCH v2] mmc: mxsmmc: Fix operation with DMA
Marek Vasut
marex at denx.de
Mon Apr 2 21:38:00 CEST 2012
Dear Anatolij Gustschin,
> Hi Fabio,
>
> On Mon, 2 Apr 2012 16:18:18 -0300
>
> Fabio Estevam <festevam at gmail.com> wrote:
> > On Mon, Apr 2, 2012 at 4:03 PM, Marek Vasut <marex at denx.de> wrote:
> > > Because that's called before relocation ;-)
> >
> > What about this?
> >
> > --- a/drivers/dma/apbh_dma.c
> > +++ b/drivers/dma/apbh_dma.c
> > @@ -35,6 +35,7 @@
> >
> > static struct mxs_dma_chan mxs_dma_channels[MXS_MAX_DMA_CHANNELS];
> >
> > +static int first;
> >
> > /*
> >
> > * Test is the DMA channel is valid channel
> > */
> >
> > @@ -346,6 +347,10 @@ struct mxs_dma_desc *mxs_dma_desc_alloc(void)
> >
> > struct mxs_dma_desc *pdesc;
> > uint32_t size;
> >
> > + if (!first)
> > + mxs_dma_init();
> > + first++;
> > +
> >
> > size = roundup(sizeof(struct mxs_dma_desc), MXS_DMA_ALIGNMENT);
> > pdesc = memalign(MXS_DMA_ALIGNMENT, size);
> >
> > Too ugly? Or any better place for calling mxs_dma_init()?
>
> Won't calling mxs_dma_init() from arch_misc_init() work?
No, because that's called after NAND is inited. And NAND needs DMA for it's init
:(
>
> Thanks,
> Anatolij
Best regards,
Marek Vasut
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