ASoC: rockchip: spdif: increase dma burst size

increase dma burst size from 4 to 16 to optimize dma transfer.

Change-Id: I1a9112e6b89ed1f29d24a3e4b5f42bf4201a9e71
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>

diff --git a/sound/soc/rockchip/rk_spdif.c b/sound/soc/rockchip/rk_spdif.c
index 003569a9ff7433baa047800858bc48c31d12ff2c..12f5f52a6fed66976c3ed34af078ed85a3ed6cac 100755 (executable)
--- a/sound/soc/rockchip/rk_spdif.c
+++ b/sound/soc/rockchip/rk_spdif.c
@@ -135,6 +135,9 @@
 #define INTCR_SDBEIE_ENABLE            (0x1 << 4)
 #define INTCR_SDBEIE_MASK              (0x1 << 4)
 
+/* size * width: 16*4 = 64 bytes */
+#define SPDIF_DMA_BURST_SIZE           (16)
+
 struct rockchip_spdif_info {
        spinlock_t lock;/*lock parmeter setting.*/
        void __iomem *regs;
@@ -451,7 +454,7 @@ static int spdif_probe(struct platform_device *pdev)
 
        spdif->dma_playback.addr = mem_res->start + SMPDR;
        spdif->dma_playback.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-       spdif->dma_playback.maxburst = 4;
+       spdif->dma_playback.maxburst = SPDIF_DMA_BURST_SIZE;
 
        ret = snd_soc_register_component(&pdev->dev,
                                         &rockchip_spdif_component,