| Message ID | 1405094182-13962-1-git-send-email-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Vinod Koul |
| Headers | show |
On Fri, Jul 11, 2014 at 05:56:21PM +0200, Geert Uytterhoeven wrote: > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- > v2: > - New > --- > Documentation/dmaengine.txt | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt > index 879b6e31e2da..87d3f192e160 100644 > --- a/Documentation/dmaengine.txt > +++ b/Documentation/dmaengine.txt > @@ -100,8 +100,10 @@ The slave DMA usage consists of following steps: > The peripheral driver is expected to have mapped the scatterlist for > the DMA operation prior to calling device_prep_slave_sg, and must > keep the scatterlist mapped until the DMA operation has completed. > - The scatterlist must be mapped using the DMA struct device. So, > - normal setup should look like this: > + The scatterlist must be mapped using the DMA struct device. > + If a mapping needs to be synchronized later, dma_sync_*_for_*() must be > + called using the DMA struct device, too. > + So, normal setup should look like this: > > nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len); > if (nr_sg == 0) > -- > 1.9.1 > Applied, thanks
diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt index 879b6e31e2da..87d3f192e160 100644 --- a/Documentation/dmaengine.txt +++ b/Documentation/dmaengine.txt @@ -100,8 +100,10 @@ The slave DMA usage consists of following steps: The peripheral driver is expected to have mapped the scatterlist for the DMA operation prior to calling device_prep_slave_sg, and must keep the scatterlist mapped until the DMA operation has completed. - The scatterlist must be mapped using the DMA struct device. So, - normal setup should look like this: + The scatterlist must be mapped using the DMA struct device. + If a mapping needs to be synchronized later, dma_sync_*_for_*() must be + called using the DMA struct device, too. + So, normal setup should look like this: nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len); if (nr_sg == 0)
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- v2: - New --- Documentation/dmaengine.txt | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)