ASoC: tegra: fix maxburst settings in dmaengine code

The I2S controllers are programmed with an "attention" level of 4 DWORDs.
This must match the configuration passed to the DMA driver, so that when
they burst in data, they don't overflow the available FIFO space. Also,
the burst size is relevant to the destination for playback, and source
for capture, not vice-versa as originally written.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org

diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
index 5658bcec1931ce5a76a75a32b020730f41da8c13..8d6900c1ee47e8d1a263584bf470e5c2eec56af4 100644 (file)
--- a/sound/soc/tegra/tegra_pcm.c
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -334,11 +334,11 @@ static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
                slave_config.dst_addr = dmap->addr;
-               slave_config.src_maxburst = 0;
+               slave_config.dst_maxburst = 4;
        } else {
                slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
                slave_config.src_addr = dmap->addr;
-               slave_config.dst_maxburst = 0;
+               slave_config.src_maxburst = 4;
        }
        slave_config.slave_id = dmap->req_sel;