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dmaengine: sh: rz-dmac: Fix destination and source data size setting 

commit c6ec8c83a2 upstream.

Before setting DDS and SDS values, we need to clear its value first
otherwise, we get incorrect results when we change/update the DMA bus
width several times due to the 'OR' expression.

Fixes: 5000d37042 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Cc: stable@kernel.org
Signed-off-by: Hien Huynh <hien.huynh.px@renesas.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230706112150.198941-3-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hien Huynh 2023-07-06 12:21:50 +01:00 committed by Greg Kroah-Hartman
parent 0476f2016d
commit 6b195e07a2
1 changed files with 7 additions and 4 deletions
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11
drivers/dma/sh/rz-dmac.c
View File

@ -9,6 +9,7 @@
* Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com>
*/
#include <linux/bitfield.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
@ -143,8 +144,8 @@ struct rz_dmac {
#define CHCFG_REQD BIT(3)
#define CHCFG_SEL(bits) ((bits) & 0x07)
#define CHCFG_MEM_COPY (0x80400008)
#define CHCFG_FILL_DDS(a) (((a) << 16) & GENMASK(19, 16))
#define CHCFG_FILL_SDS(a) (((a) << 12) & GENMASK(15, 12))
#define CHCFG_FILL_DDS_MASK GENMASK(19, 16)
#define CHCFG_FILL_SDS_MASK GENMASK(15, 12)
#define CHCFG_FILL_TM(a) (((a) & BIT(5)) << 22)
#define CHCFG_FILL_AM(a) (((a) & GENMASK(4, 2)) << 6)
#define CHCFG_FILL_LVL(a) (((a) & BIT(1)) << 5)
@ -607,13 +608,15 @@ static int rz_dmac_config(struct dma_chan *chan,
if (val == CHCFG_DS_INVALID)
return -EINVAL;
channel->chcfg |= CHCFG_FILL_DDS(val);
channel->chcfg &= ~CHCFG_FILL_DDS_MASK;
channel->chcfg |= FIELD_PREP(CHCFG_FILL_DDS_MASK, val);
val = rz_dmac_ds_to_val_mapping(config->src_addr_width);
if (val == CHCFG_DS_INVALID)
return -EINVAL;
channel->chcfg |= CHCFG_FILL_SDS(val);
channel->chcfg &= ~CHCFG_FILL_SDS_MASK;
channel->chcfg |= FIELD_PREP(CHCFG_FILL_SDS_MASK, val);
return 0;
}