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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>
This commit is contained in:
Pierre-Yves MORDRET 2018-04-13 15:52:12 +02:00 committed by Vinod Koul
parent 60cc43fc88
commit ee6de9ac52
1 changed files with 3 additions and 6 deletions
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9
drivers/dma/stm32-mdma.c
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@ -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;
}