diff options
Diffstat (limited to 'drivers/media/video/cx88/cx88-core.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c index d72e177607a..888ccb671e6 100644 --- a/drivers/media/video/cx88/cx88-core.c +++ b/drivers/media/video/cx88/cx88-core.c @@ -792,6 +792,11 @@ int cx88_start_audio_dma(struct cx88_core *core) { /* constant 128 made buzz in analog Nicam-stereo for bigger fifo_size */ int bpl = cx88_sram_channels[SRAM_CH25].fifo_size/4; + + /* If downstream RISC is enabled, bail out; ALSA is managing DMA */ + if (cx_read(MO_AUD_DMACNTRL) & 0x10) + return 0; + /* setup fifo + format */ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 0); cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], bpl, 0); @@ -801,11 +806,16 @@ int cx88_start_audio_dma(struct cx88_core *core) /* start dma */ cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */ + return 0; } int cx88_stop_audio_dma(struct cx88_core *core) { + /* If downstream RISC is enabled, bail out; ALSA is managing DMA */ + if (cx_read(MO_AUD_DMACNTRL) & 0x10) + return 0; + /* stop dma */ cx_write(MO_AUD_DMACNTRL, 0x0000); |