From e738e35d1e9ae15b597c713e0b74e9a535020c0d Mon Sep 17 00:00:00 2001 From: Ricardo Cerqueira Date: Thu, 17 Aug 2006 18:40:28 -0300 Subject: [PATCH] V4L/DVB (4504): Enable audio DMA restart on channel change even when cx88-alsa is compiled cx88-alsa can be compiled in (in distro built kernels, for example), but not used. In those cases, the audio DMA restart is needed for proper sound on NICAM channels. This patch enables the DMA restart even with ALSA, but the functions now check if cx88-alsa is really active. Signed-off-by: Ricardo Cerqueira Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx88/cx88-core.c | 10 ++++++++++ drivers/media/video/cx88/cx88-tvaudio.c | 4 ---- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/media/video/cx88/cx88-core.c b/drivers/media/video/cx88/cx88-core.c index d72e177607a7..888ccb671e6c 100644 --- a/drivers/media/video/cx88/cx88-core.c +++ b/drivers/media/video/cx88/cx88-core.c @@ -792,6 +792,11 @@ 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; + + /* If downstream RISC is enabled, bail out; ALSA is managing DMA */ + if (cx_read(MO_AUD_DMACNTRL) & 0x10) + return 0; + /* setup fifo + format */ cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 0); cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], bpl, 0); @@ -801,11 +806,16 @@ int cx88_start_audio_dma(struct cx88_core *core) /* start dma */ cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */ + return 0; } int cx88_stop_audio_dma(struct cx88_core *core) { + /* If downstream RISC is enabled, bail out; ALSA is managing DMA */ + if (cx_read(MO_AUD_DMACNTRL) & 0x10) + return 0; + /* stop dma */ cx_write(MO_AUD_DMACNTRL, 0x0000); diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c index cbd85feec922..741e7c5e69ec 100644 --- a/drivers/media/video/cx88/cx88-tvaudio.c +++ b/drivers/media/video/cx88/cx88-tvaudio.c @@ -137,14 +137,10 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl) { u32 volume; -#ifndef CONFIG_VIDEO_CX88_ALSA /* restart dma; This avoids buzz in NICAM and is good in others */ cx88_stop_audio_dma(core); -#endif cx_write(AUD_RATE_THRES_DMD, 0x000000C0); -#ifndef CONFIG_VIDEO_CX88_ALSA cx88_start_audio_dma(core); -#endif if (cx88_boards[core->board].blackbird) { /* sets sound input from external adc */ -- GitLab