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authorBen Walker <benjamin.walker@intel.com>2022-03-01 21:25:49 +0300
committerVinod Koul <vkoul@kernel.org>2022-04-20 14:58:12 +0300
commitceabe10cf5d642b6ea80e77193f9cd4446df26b5 (patch)
tree7d92fd5bd4e7a449b3b0cfecf20d2283e32b5968 /drivers
parentfc44ff0ae9f2aa20b64c4e63ab4614156df80240 (diff)
downloadlinux-ceabe10cf5d642b6ea80e77193f9cd4446df26b5.tar.xz
dmaengine: at_hdmac: In atc_prep_dma_memset, treat value as a single byte
The value passed in to .prep_dma_memset is to be treated as a single byte repeating pattern. Signed-off-by: Ben Walker <benjamin.walker@intel.com> Cc: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20220301182551.883474-3-benjamin.walker@intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/dma/at_hdmac.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 30ae36124b1d..5a50423b7378 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -942,6 +942,7 @@ atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
struct at_desc *desc;
void __iomem *vaddr;
dma_addr_t paddr;
+ char fill_pattern;
dev_vdbg(chan2dev(chan), "%s: d%pad v0x%x l0x%zx f0x%lx\n", __func__,
&dest, value, len, flags);
@@ -963,7 +964,14 @@ atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
__func__);
return NULL;
}
- *(u32*)vaddr = value;
+
+ /* Only the first byte of value is to be used according to dmaengine */
+ fill_pattern = (char)value;
+
+ *(u32*)vaddr = (fill_pattern << 24) |
+ (fill_pattern << 16) |
+ (fill_pattern << 8) |
+ fill_pattern;
desc = atc_create_memset_desc(chan, paddr, dest, len);
if (!desc) {