ASoC: DaVinci: McASP FIFO related updates

The DMA params for McASP with FIFO has been updated so that it works for
various FIFO levels. A member- 'fifo_level' has been added to the DMA
params data structure. The fifo_level can be adjusted by the tx[rx]_numevt
platform data. This is relevant only for DA8xx/OMAP-L1xx platforms. This
implementation has been tested for numevt values 1, 2, 4, 8.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 7 insertions, 10 deletions

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 5d1f98a4c978..50ad0519a8fa 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -714,16 +714,13 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
         struct davinci_pcm_dma_params *dma_params =
                                         &dev->dma_params[substream->stream];
         int word_length;
-        u8 numevt;
+        u8 fifo_level;
 
         davinci_hw_common_param(dev, substream->stream);
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-                numevt = dev->txnumevt;
+                fifo_level = dev->txnumevt;
         else
-                numevt = dev->rxnumevt;
-
-        if (!numevt)
-                numevt = 1;
+                fifo_level = dev->rxnumevt;
 
         if (dev->op_mode == DAVINCI_MCASP_DIT_MODE)
                 davinci_hw_dit_param(dev);
@@ -751,12 +748,12 @@ static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
                 return -EINVAL;
         }
 
-        if (dev->version == MCASP_VERSION_2) {
-                dma_params->data_type *= numevt;
-                dma_params->acnt = 4 * numevt;
-        } else
+        if (dev->version == MCASP_VERSION_2 && !fifo_level)
+                dma_params->acnt = 4;
+        else
                 dma_params->acnt = dma_params->data_type;
 
+        dma_params->fifo_level = fifo_level;
         davinci_config_channel_size(dev, word_length);
 
         return 0;