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>

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index 4ae7070..2ab8093 100644 (file)
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -397,6 +397,8 @@ static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
        }
 
        dma_params->acnt  = dma_params->data_type;
+       dma_params->fifo_level = 0;
+
        rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(1);
        xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(1);
 

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 5d1f98a..50ad051 100644 (file)
--- 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;

diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
index 359e99e..1152d8b 100644 (file)
--- a/sound/soc/davinci/davinci-pcm.c
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -66,38 +66,53 @@ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
        dma_addr_t dma_pos;
        dma_addr_t src, dst;
        unsigned short src_bidx, dst_bidx;
+       unsigned short src_cidx, dst_cidx;
        unsigned int data_type;
        unsigned short acnt;
        unsigned int count;
+       unsigned int fifo_level;
 
        period_size = snd_pcm_lib_period_bytes(substream);
        dma_offset = prtd->period * period_size;
        dma_pos = runtime->dma_addr + dma_offset;
+       fifo_level = prtd->params->fifo_level;
 
        pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
                "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size);
 
        data_type = prtd->params->data_type;
        count = period_size / data_type;
+       if (fifo_level)
+               count /= fifo_level;
 
        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                src = dma_pos;
                dst = prtd->params->dma_addr;
                src_bidx = data_type;
                dst_bidx = 0;
+               src_cidx = data_type * fifo_level;
+               dst_cidx = 0;
        } else {
                src = prtd->params->dma_addr;
                dst = dma_pos;
                src_bidx = 0;
                dst_bidx = data_type;
+               src_cidx = 0;
+               dst_cidx = data_type * fifo_level;
        }
 
        acnt = prtd->params->acnt;
        edma_set_src(lch, src, INCR, W8BIT);
        edma_set_dest(lch, dst, INCR, W8BIT);
-       edma_set_src_index(lch, src_bidx, 0);
-       edma_set_dest_index(lch, dst_bidx, 0);
-       edma_set_transfer_params(lch, acnt, count, 1, 0, ASYNC);
+
+       edma_set_src_index(lch, src_bidx, src_cidx);
+       edma_set_dest_index(lch, dst_bidx, dst_cidx);
+
+       if (!fifo_level)
+               edma_set_transfer_params(lch, acnt, count, 1, 0, ASYNC);
+       else
+               edma_set_transfer_params(lch, acnt, fifo_level, count,
+                                                       fifo_level, ABSYNC);
 
        prtd->period++;
        if (unlikely(prtd->period >= runtime->periods))

diff --git a/sound/soc/davinci/davinci-pcm.h b/sound/soc/davinci/davinci-pcm.h
index 8746606..c8b0d2b 100644 (file)
--- a/sound/soc/davinci/davinci-pcm.h
+++ b/sound/soc/davinci/davinci-pcm.h
@@ -23,6 +23,7 @@ struct davinci_pcm_dma_params {
        enum dma_event_q eventq_no;     /* event queue number */
        unsigned char data_type;        /* xfer data type */
        unsigned char convert_mono_stereo;
+       unsigned int fifo_level;
 };