ASoC: sprd: Add Spreadtrum audio compress offload support

We use 2-stage DMA mode to support Spreadtrum audio compress offload, which means we use one DMA source channel to transfer data from IRAM buffer to the DSP fifo to do decoding/encoding, once IRAM buffer is empty by transferring done, another DMA destination channel will be triggered automatically to start to transfer data from DDR buffer to the IRAM buffer. This can reduce the AP subsystem wakeup times to save power. Co-developed-by: Yintang Ren <yintang.ren@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
mariux64 · Apr 2, 2019 · cce1396 · cce1396
1 parent f661fa2
commit cce1396
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Showing 5 changed files with 721 additions and 2 deletions.
diff --git a/sound/soc/sprd/Kconfig b/sound/soc/sprd/Kconfig
@@ -1,6 +1,7 @@
 config SND_SOC_SPRD
 	tristate "SoC Audio for the Spreadtrum SoC chips"
 	depends on ARCH_SPRD || COMPILE_TEST
+	select SND_SOC_COMPRESS
 	help
 	  Say Y or M if you want to add support for codecs attached to
 	  the Spreadtrum SoCs' Audio interfaces.
diff --git a/sound/soc/sprd/Makefile b/sound/soc/sprd/Makefile
@@ -1,4 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 # Spreadtrum Audio Support
 
-obj-$(CONFIG_SND_SOC_SPRD)	+= sprd-pcm-dma.o
+obj-$(CONFIG_SND_SOC_SPRD)	+= sprd-pcm-dma.o sprd-pcm-compress.o