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Commit 4a9723e8 authored by Ludovic Desroches's avatar Ludovic Desroches Committed by Vinod Koul
Browse files

dmaengine: at_xdmac: align descriptors on 64 bits 



Having descriptors aligned on 64 bits allows update CNDA and CUBC in an
atomic way.

Signed-off-by: default avatarLudovic Desroches <ludovic.desroches@atmel.com>
Fixes: e1f7c9ee ("dmaengine: at_xdmac: creation of the atmel
eXtended DMA Controller driver")
Cc: stable@vger.kernel.org #v4.1 and later
Reviewed-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent c56d329e

drivers/dma/at_xdmac.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -242,7 +242,7 @@ struct at_xdmac_lld { 
	u32		mbr_dus;	/* Destination Microblock Stride Register */

	u32		mbr_dus;	/* Destination Microblock Stride Register */

};

};







/* 64-bit alignment needed to update CNDA and CUBC registers in an atomic way. */

struct at_xdmac_desc {

struct at_xdmac_desc {

	struct at_xdmac_lld		lld;

	struct at_xdmac_lld		lld;

	enum dma_transfer_direction	direction;

	enum dma_transfer_direction	direction;
@@ -253,7 +253,7 @@ struct at_xdmac_desc { 
	unsigned int			xfer_size;

	unsigned int			xfer_size;

	struct list_head		descs_list;

	struct list_head		descs_list;

	struct list_head		xfer_node;

	struct list_head		xfer_node;

};

} __aligned(sizeof(u64));





static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)

static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb)

{

{