diff options
| author | Mauro Carvalho Chehab <mchehab@brturbo.com.br> | 2005-12-01 00:51:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-01 15:48:57 -0800 |
| commit | 6f502b8a7858ecfa7d2a0762f7663b8b3d0808fc (patch) | |
| tree | b6f6ef7e9918324136eabb506c37f7b91bd647b2 /drivers/media/video/cx88/cx88-core.c | |
| parent | c87c948ebd75525df4d67dd5b40e6ea81859cc17 (diff) | |
[PATCH] V4L: Enables audio DMA setting on cx88 chips, even when dma not in use
- Enabled audio DMA transfer code even when DMA not in use to solve a
problem on some broken cx88 chips.
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/media/video/cx88/cx88-core.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-core.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c index b18e7a33081a..bb6eb54e19ce 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: |