From 0d6c97742993a00ee2cbfbd6d68fba669c17bf50 Mon Sep 17 00:00:00 2001 From: Troy Kisky Date: Wed, 18 Nov 2009 17:49:51 -0700 Subject: ASoC: DaVinci: i2s, reduce underruns by combining into 1 element Allow the left and right 16 bit samples to be shifted out as 1 32 bit sample. Signed-off-by: Troy Kisky Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- arch/arm/mach-davinci/include/mach/asp.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/arm/mach-davinci/include/mach/asp.h') diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h index 18e4ce34ece..019c6473341 100644 --- a/arch/arm/mach-davinci/include/mach/asp.h +++ b/arch/arm/mach-davinci/include/mach/asp.h @@ -51,6 +51,12 @@ struct snd_platform_data { u32 rx_dma_offset; enum dma_event_q eventq_no; /* event queue number */ unsigned int codec_fmt; + /* + * Allowing this is more efficient and eliminates left and right swaps + * caused by underruns, but will swap the left and right channels + * when compared to previous behavior. + */ + unsigned enable_channel_combine:1; /* McASP specific fields */ int tdm_slots; -- cgit v1.2.3-18-g5258 From 1e224f322bf22280957a5f76164d848526ed9b08 Mon Sep 17 00:00:00 2001 From: Troy Kisky Date: Wed, 18 Nov 2009 17:49:53 -0700 Subject: ASoC: DaVinci: pcm, fix underrun by using sram Fix underruns by using dma to copy 1st to sram in a ping/pong buffer style and then copying from the sram to the ASP. This also has the advantage of tolerating very long interrupt latency on dma completion. Signed-off-by: Troy Kisky Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- arch/arm/mach-davinci/include/mach/asp.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/arm/mach-davinci/include/mach/asp.h') diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h index 019c6473341..e07f70ed7c5 100644 --- a/arch/arm/mach-davinci/include/mach/asp.h +++ b/arch/arm/mach-davinci/include/mach/asp.h @@ -57,6 +57,8 @@ struct snd_platform_data { * when compared to previous behavior. */ unsigned enable_channel_combine:1; + unsigned sram_size_playback; + unsigned sram_size_capture; /* McASP specific fields */ int tdm_slots; -- cgit v1.2.3-18-g5258