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authorYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>2018-02-14 18:40:12 +0900
committerVinod Koul <vinod.koul@intel.com>2018-02-27 20:34:38 +0530
commitd716d9b702bb759dd6fb50804f10a174bd156d71 (patch)
treeb43a03870b1e9aa9adb0e1e217f34fee23a26394 /drivers/dma
parent7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (diff)
downloadlinux-d716d9b702bb759dd6fb50804f10a174bd156d71.tar.bz2
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>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/sh/rcar-dmac.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index e3ff162c03fc..d0cacdb0713e 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -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