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Commit 12700760 authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Greg Kroah-Hartman
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dmaengine: rcar-dmac: fix max_chunk_size for R-Car Gen3 



[ Upstream commit d716d9b702bb759dd6fb50804f10a174bd156d71 ]

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: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: default avatarSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bc3d7001

drivers/dma/sh/rcar-dmac.c

+1 −1
Original line number Diff line number Diff line
@@ -870,7 +870,7 @@ 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