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

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[ Upstream commit d716d9b702 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yoshihiro Shimoda 2018-02-14 18:40:12 +09:00 committed by Greg Kroah-Hartman
parent 3c08f8140a
commit 421c15e803
1 changed files with 1 additions and 1 deletions
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2
drivers/dma/sh/rcar-dmac.c
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@ -880,7 +880,7 @@ 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