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V4L/DVB (3266): Fix NICAM buzz on analog sound

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Apparently, having the number of lines fixed at 4 reduces (or even kills)
the buzz found in NICAM stereo with analog sound.

Signed-off-by: Marcin Rudowski <mar_rud@poczta.onet.pl>
Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Marcin Rudowski 2006-02-06 09:15:14 -02:00 committed by Mauro Carvalho Chehab
parent 36377a19a0
commit 1b0bb68d30
1 changed files with 6 additions and 4 deletions
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10
drivers/media/video/cx88/cx88-core.c
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@ -787,12 +787,14 @@ static int set_pll(struct cx88_core *core, int prescale, u32 ofreq)
int cx88_start_audio_dma(struct cx88_core *core) 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;
/* setup fifo + format */ /* setup fifo + format */
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0); cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 0);
cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0); cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], bpl, 0);
cx_write(MO_AUDD_LNGTH, 128); /* fifo bpl size */ cx_write(MO_AUDD_LNGTH, bpl); /* fifo bpl size */
cx_write(MO_AUDR_LNGTH, 128); /* fifo bpl size */ cx_write(MO_AUDR_LNGTH, bpl); /* fifo bpl size */
/* start dma */ /* start dma */
cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */ cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */