ASoC: rockchip: i2s: fix maxburst of dma data to 4
Since RK3288 DMAC's burst length only support max to 4, here set maxburst of playback and capture dma data to 4. Signed-off-by: NJianqun Xu <jay.xu@rock-chips.com> Signed-off-by: NMark Brown <broonie@kernel.org>
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