Commit d716d9b7 authored Feb 14, 2018 by Yoshihiro Shimoda Committed by Vinod Koul Feb 27, 2018

dmaengine: rcar-dmac: fix max_chunk_size for R-Car Gen3



According to R-Car Gen3 Rev.0.80 manual, the DMATCR can be set to
16,777,215 as maximum. So, this patch fixes the max_chunk_size for
safety on all of SoCs. Otherwise, a system may hang if the DMATCR
is set to 0 on R-Car Gen3.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

parent 7928b2cb

drivers/dma/sh/rcar-dmac.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -917,7 +917,7 @@ rcar_dmac_chan_prep_sg(struct rcar_dmac_chan chan, struct scatterlist sgl,

		rcar_dmac_chan_configure_desc(chan, desc);

		max_chunk_size = (RCAR_DMATCR_MASK + 1) << desc->xfer_shift;
		max_chunk_size = RCAR_DMATCR_MASK << desc->xfer_shift;

		/*
		* Allocate and fill the transfer chunk descriptors. We own the only

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