On Mon, Oct 24, 2016 at 03:29:15PM +0200, Niklas Cassel wrote: > From: Niklas Cassel <niklas.cassel@xxxxxxxx> > > Due to a hardware bug, reading memory (from the Accelerator Coherency Port) > with a burst size equal to the maximum burst size allowed by the DMA > hardware's buffer size will cause a hardware hang on the ARTPEC-6 SoC, > where the only solution is a manual power cycle. > On ARTPEC-6, this hardware bug does not trigger when writing memory (to the > Accelerator Coherency Port) with a burst size equal to the maximum burst > size allowed by the DMA hardware's buffer size. > > To avoid this hardware hang, introduce a new optional max-burst property > for memory reads. For completeness, also introduce a max-burst property for > memory writes. > > Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx> > --- > Documentation/devicetree/bindings/dma/nbpfaxi.txt | 8 +++++ > drivers/dma/nbpfaxi.c | 38 ++++++++++++++++++++--- > 2 files changed, 42 insertions(+), 4 deletions(-) Acked-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
