diff options
Diffstat (limited to 'drivers/media/video/cx88/cx88-core.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-core.c | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c index eb806af17182a..bb6eb54e19ced 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; @@ -877,12 +900,16 @@ static int set_tvaudio(struct cx88_core *core) cx88_set_tvaudio(core); /* cx88_set_stereo(dev,V4L2_TUNER_MODE_STEREO); */ - cx_write(MO_AUDD_LNGTH, 128); /* fifo size */ - cx_write(MO_AUDR_LNGTH, 128); /* fifo size */ - cx_write(MO_AUD_DMACNTRL, 0x03); /* need audio fifo */ +/* + 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; @@ -1204,6 +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: |