diff options
| author |   Ben Walker <benjamin.walker@intel.com> | 2022-03-01 11:25:49 -0700 |
|---|---|---|
| committer |   Vinod Koul <vkoul@kernel.org> | 2022-04-20 17:28:12 +0530 |
| commit | ceabe10cf5d642b6ea80e77193f9cd4446df26b5 (patch) | |
| tree | 7d92fd5bd4e7a449b3b0cfecf20d2283e32b5968 /drivers/dma | |
| parent | dmaengine: Document dmaengine_prep_dma_memset (diff) | |
| download | linux-dev-ceabe10cf5d642b6ea80e77193f9cd4446df26b5.tar.xz linux-dev-ceabe10cf5d642b6ea80e77193f9cd4446df26b5.zip | |
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/dma')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 10 |
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) { |