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>

1 files 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 */