From 17801f5fa2e31b60f26aadd7ba41395dd1b1093e Mon Sep 17 00:00:00 2001
From: Marcin Rudowski <mar_rud@poczta.onet.pl>
Date: Mon, 6 Feb 2006 09:15:14 -0200
Subject: [PATCH] V4L/DVB (3266): Fix NICAM buzz on analog sound
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>
---
drivers/media/video/cx88/cx88-core.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c
index 8d6d6a6cf785..3720f24a25cf 100644
--- a/drivers/media/video/cx88/cx88-core.c
+++ b/drivers/media/video/cx88/cx88-core.c
@@ -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)
{
+ /* 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 */
- cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
- cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
+ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 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_AUDR_LNGTH, 128); /* fifo bpl size */
+ cx_write(MO_AUDD_LNGTH, bpl); /* fifo bpl size */
+ cx_write(MO_AUDR_LNGTH, bpl); /* fifo bpl size */
/* start dma */
cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
--
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