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[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>
This commit is contained in:
Mauro Carvalho Chehab 2005-12-01 00:51:34 -08:00 committed by Linus Torvalds
parent c87c948ebd
commit 6f502b8a78
3 changed files with 39 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/media/video/cx88/cx88-core.c
View File

@ -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:

3
drivers/media/video/cx88/cx88-tvaudio.c
View File

@ -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 */

4
drivers/media/video/cx88/cx88.h
View File

@ -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 */