V4L/DVB: tm6000+audio

I rework my last patch for audio and now audio works well. This patch
can be submited to GIT tree Quality of audio now is good for SECAM-DK.
For other standard I set some value from datasheet need some tests.

1. Fix pcm buffer overflow
2. Rework pcm buffer fill method
3. Swap bytes in audio stream
4. Change some registers value for TM6010
5. Change pcm buffer size

Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov <d.belimov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 41 insertions, 15 deletions

diff --git a/drivers/staging/tm6000/tm6000-alsa.c b/drivers/staging/tm6000/tm6000-alsa.c
index 087137d..a99101f 100644
--- a/drivers/staging/tm6000/tm6000-alsa.c
+++ b/drivers/staging/tm6000/tm6000-alsa.c
@@ -160,15 +160,15 @@ static struct snd_pcm_hardware snd_tm6000_digital_hw = {
 		SNDRV_PCM_INFO_MMAP_VALID,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 
-	.rates =		SNDRV_PCM_RATE_48000,
+	.rates =		SNDRV_PCM_RATE_CONTINUOUS,
 	.rate_min =		48000,
 	.rate_max =		48000,
 	.channels_min = 2,
 	.channels_max = 2,
-	.period_bytes_min = 62720,
-	.period_bytes_max = 62720,
+	.period_bytes_min = 64,
+	.period_bytes_max = 12544,
 	.periods_min = 1,
-	.periods_max = 1024,
+	.periods_max = 98,
 	.buffer_bytes_max = 62720 * 8,
 };
 
@@ -211,38 +211,64 @@ static int tm6000_fillbuf(struct tm6000_core *core, char *buf, int size)
 	struct snd_pcm_runtime *runtime;
 	int period_elapsed = 0;
 	unsigned int stride, buf_pos;
+	int length;
 
-	if (!size || !substream)
+	if (!size || !substream) {
+		dprintk(1, "substream was NULL\n");
 		return -EINVAL;
+	}
 
 	runtime = substream->runtime;
-	if (!runtime || !runtime->dma_area)
+	if (!runtime || !runtime->dma_area) {
+		dprintk(1, "runtime was NULL\n");
 		return -EINVAL;
+	}
 
 	buf_pos = chip->buf_pos;
 	stride = runtime->frame_bits >> 3;
 
+	if (stride == 0) {
+		dprintk(1, "stride is zero\n");
+		return -EINVAL;
+	}
+
+	length = size / stride;
+	if (length == 0) {
+		dprintk(1, "%s: length was zero\n", __func__);
+		return -EINVAL;
+	}
+
 	dprintk(1, "Copying %d bytes at %p[%d] - buf size=%d x %d\n", size,
 		runtime->dma_area, buf_pos,
 		(unsigned int)runtime->buffer_size, stride);
 
-	if (buf_pos + size >= runtime->buffer_size * stride) {
-		unsigned int cnt = runtime->buffer_size * stride - buf_pos;
-		memcpy(runtime->dma_area + buf_pos, buf, cnt);
-		memcpy(runtime->dma_area, buf + cnt, size - cnt);
+	if (buf_pos + length >= runtime->buffer_size) {
+		unsigned int cnt = runtime->buffer_size - buf_pos;
+		memcpy(runtime->dma_area + buf_pos * stride, buf, cnt * stride);
+		memcpy(runtime->dma_area, buf + cnt * stride,
+			length * stride - cnt * stride);
 	} else
-		memcpy(runtime->dma_area + buf_pos, buf, size);
+		memcpy(runtime->dma_area + buf_pos * stride, buf,
+			length * stride);
 
-	chip->buf_pos += size;
-	if (chip->buf_pos >= runtime->buffer_size * stride)
-		chip->buf_pos -= runtime->buffer_size * stride;
+#ifndef NO_PCM_LOCK
+       snd_pcm_stream_lock(substream);
+#endif
 
-	chip->period_pos += size;
+	chip->buf_pos += length;
+	if (chip->buf_pos >= runtime->buffer_size)
+		chip->buf_pos -= runtime->buffer_size;
+
+	chip->period_pos += length;
 	if (chip->period_pos >= runtime->period_size) {
 		chip->period_pos -= runtime->period_size;
 		period_elapsed = 1;
 	}
 
+#ifndef NO_PCM_LOCK
+       snd_pcm_stream_unlock(substream);
+#endif
+
 	if (period_elapsed)
 		snd_pcm_period_elapsed(substream);