Commit ee6de9ac authored by Pierre-Yves MORDRET's avatar Pierre-Yves MORDRET Committed by Vinod Koul
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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: default avatarPierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 60cc43fc

drivers/dma/stm32-mdma.c

+3 −6
Original line number Diff line number Diff line
@@ -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;

}