dmaengine: stm32-mdma: align TLEN and buffer length on burst (ee6de9ac) · Commits · 戴 / test

Both buffer Transfer Length (TLEN if any) and transfer size have to be aligned on burst size (burst beats*bus width). Signed-off-by:

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;
		}