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-rw-r--r--drivers/media/video/cx88/cx88-core.c32
-rw-r--r--drivers/media/video/cx88/cx88-tvaudio.c3
-rw-r--r--drivers/media/video/cx88/cx88.h4
3 files changed, 39 insertions, 0 deletions
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index b18e7a33081..bb6eb54e19c 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -837,6 +837,29 @@ static int set_pll(struct cx88_core *core, int prescale, u32 ofreq)
return -1;
}
+int cx88_start_audio_dma(struct cx88_core *core)
+{
+ /* setup fifo + format */
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
+
+ cx_write(MO_AUDD_LNGTH, 128); /* fifo bpl size */
+ cx_write(MO_AUDR_LNGTH, 128); /* fifo bpl size */
+
+ /* start dma */
+ cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
+
+ return 0;
+}
+
+int cx88_stop_audio_dma(struct cx88_core *core)
+{
+ /* stop dma */
+ cx_write(MO_AUD_DMACNTRL, 0x0000);
+
+ return 0;
+}
+
static int set_tvaudio(struct cx88_core *core)
{
struct cx88_tvnorm *norm = core->tvnorm;
@@ -877,9 +900,16 @@ static int set_tvaudio(struct cx88_core *core)
cx88_set_tvaudio(core);
/* cx88_set_stereo(dev,V4L2_TUNER_MODE_STEREO); */
+/*
+ This should be needed only on cx88-alsa. It seems that some cx88 chips have
+ bugs and does require DMA enabled for it to work.
+ */
+ cx88_start_audio_dma(core);
return 0;
}
+
+
int cx88_set_tvnorm(struct cx88_core *core, struct cx88_tvnorm *norm)
{
u32 fsc8;
@@ -1201,6 +1231,8 @@ EXPORT_SYMBOL(cx88_set_scale);
EXPORT_SYMBOL(cx88_vdev_init);
EXPORT_SYMBOL(cx88_core_get);
EXPORT_SYMBOL(cx88_core_put);
+EXPORT_SYMBOL(cx88_start_audio_dma);
+EXPORT_SYMBOL(cx88_stop_audio_dma);
/*
* Local variables:
diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index a9059c53a41..a1b120c8a9b 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/drivers/media/video/cx88/cx88-tvaudio.c
@@ -132,7 +132,10 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl)
{
u32 volume;
+ /* restart dma; This avoids buzz in NICAM and is good in others */
+ cx88_stop_audio_dma(core);
cx_write(AUD_RATE_THRES_DMD, 0x000000C0);
+ cx88_start_audio_dma(core);
if (cx88_boards[core->board].blackbird) {
/* sets sound input from external adc */
diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index b19d3a9e229..27fb080fd7a 100644
--- a/drivers/media/video/cx88/cx88.h
+++ b/drivers/media/video/cx88/cx88.h
@@ -491,6 +491,10 @@ extern struct cx88_core* cx88_core_get(struct pci_dev *pci);
extern void cx88_core_put(struct cx88_core *core,
struct pci_dev *pci);
+extern int cx88_start_audio_dma(struct cx88_core *core);
+extern int cx88_stop_audio_dma(struct cx88_core *core);
+
+
/* ----------------------------------------------------------- */
/* cx88-vbi.c */