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authorPierre-Yves MORDRET <pierre-yves.mordret@st.com>2018-04-13 16:52:12 +0300
committerVinod Koul <vkoul@kernel.org>2018-04-25 12:09:53 +0300
commitee6de9ac527f0630d496303df3f270678128e6c6 (patch)
tree45a44a4550501ff4b5f86e18422984722525538b /drivers/dma
parent60cc43fc888428bb2f18f08997432d426a243338 (diff)
downloadlinux-ee6de9ac527f0630d496303df3f270678128e6c6.tar.xz
dmaengine: stm32-mdma: align TLEN and buffer length on burst
Both buffer Transfer Length (TLEN if any) and transfer size have to be aligned on burst size (burst beats*bus width). Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/stm32-mdma.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index daa1602eb9f5..4c7634ca62a7 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -410,13 +410,10 @@ static enum dma_slave_buswidth stm32_mdma_get_max_width(dma_addr_t addr,
static u32 stm32_mdma_get_best_burst(u32 buf_len, u32 tlen, u32 max_burst,
enum dma_slave_buswidth width)
{
- u32 best_burst = max_burst;
- u32 burst_len = best_burst * width;
+ u32 best_burst;
- while ((burst_len > 0) && (tlen % burst_len)) {
- best_burst = best_burst >> 1;
- burst_len = best_burst * width;
- }
+ best_burst = min((u32)1 << __ffs(tlen | buf_len),
+ max_burst * width) / width;
return (best_burst > 0) ? best_burst : 1;
}