1 files changed, 33 insertions, 18 deletions

diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 30390260bb67..b33ca7cd085b 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -235,6 +235,8 @@ struct fsi_stream {
         struct sh_dmae_slave    slave; /* see fsi_handler_init() */
         struct work_struct      work;
         dma_addr_t              dma;
+        int                     loop_cnt;
+        int                     additional_pos;
 };
 
 struct fsi_clk {
@@ -1289,6 +1291,8 @@ static int fsi_dma_init(struct fsi_priv *fsi, struct fsi_stream *io)
         io->bus_option = BUSOP_SET(24, PACKAGE_24BITBUS_BACK) |
                          BUSOP_SET(16, PACKAGE_16BITBUS_STREAM);
 
+        io->loop_cnt = 2; /* push 1st, 2nd period first, then 3rd, 4th... */
+        io->additional_pos = 0;
         io->dma = dma_map_single(dai->dev, runtime->dma_area,
                                  snd_pcm_lib_buffer_bytes(io->substream), dir);
         return 0;
@@ -1305,11 +1309,15 @@ static int fsi_dma_quit(struct fsi_priv *fsi, struct fsi_stream *io)
         return 0;
 }
 
-static dma_addr_t fsi_dma_get_area(struct fsi_stream *io)
+static dma_addr_t fsi_dma_get_area(struct fsi_stream *io, int additional)
 {
         struct snd_pcm_runtime *runtime = io->substream->runtime;
+        int period = io->period_pos + additional;
 
-        return io->dma + samples_to_bytes(runtime, io->buff_sample_pos);
+        if (period >= runtime->periods)
+                period = 0;
+
+        return io->dma + samples_to_bytes(runtime, period * io->period_samples);
 }
 
 static void fsi_dma_complete(void *data)
@@ -1321,7 +1329,7 @@ static void fsi_dma_complete(void *data)
         enum dma_data_direction dir = fsi_stream_is_play(fsi, io) ?
                 DMA_TO_DEVICE : DMA_FROM_DEVICE;
 
-        dma_sync_single_for_cpu(dai->dev, fsi_dma_get_area(io),
+        dma_sync_single_for_cpu(dai->dev, fsi_dma_get_area(io, 0),
                         samples_to_bytes(runtime, io->period_samples), dir);
 
         io->buff_sample_pos += io->period_samples;
@@ -1347,7 +1355,7 @@ static void fsi_dma_do_work(struct work_struct *work)
         struct snd_pcm_runtime *runtime;
         enum dma_data_direction dir;
         int is_play = fsi_stream_is_play(fsi, io);
-        int len;
+        int len, i;
         dma_addr_t buf;
 
         if (!fsi_stream_is_working(fsi, io))
@@ -1357,26 +1365,33 @@ static void fsi_dma_do_work(struct work_struct *work)
         runtime = io->substream->runtime;
         dir     = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
         len     = samples_to_bytes(runtime, io->period_samples);
-        buf     = fsi_dma_get_area(io);
 
-        dma_sync_single_for_device(dai->dev, buf, len, dir);
+        for (i = 0; i < io->loop_cnt; i++) {
+                buf     = fsi_dma_get_area(io, io->additional_pos);
 
-        desc = dmaengine_prep_slave_single(io->chan, buf, len, dir,
-                                           DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
-        if (!desc) {
-                dev_err(dai->dev, "dmaengine_prep_slave_sg() fail\n");
-                return;
-        }
+                dma_sync_single_for_device(dai->dev, buf, len, dir);
 
-        desc->callback          = fsi_dma_complete;
-        desc->callback_param    = io;
+                desc = dmaengine_prep_slave_single(io->chan, buf, len, dir,
+                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+                if (!desc) {
+                        dev_err(dai->dev, "dmaengine_prep_slave_sg() fail\n");
+                        return;
+                }
 
-        if (dmaengine_submit(desc) < 0) {
-                dev_err(dai->dev, "tx_submit() fail\n");
-                return;
+                desc->callback          = fsi_dma_complete;
+                desc->callback_param    = io;
+
+                if (dmaengine_submit(desc) < 0) {
+                        dev_err(dai->dev, "tx_submit() fail\n");
+                        return;
+                }
+
+                dma_async_issue_pending(io->chan);
+
+                io->additional_pos = 1;
         }
 
-        dma_async_issue_pending(io->chan);
+        io->loop_cnt = 1;
 
         /*
          * FIXME