Matthias Reichl beff053c0e ASoC: bcm2835: Add S16_LE support via packed DMA transfers ... The bcm2835-i2s driver already has support for the S16_LE format but that format hasn't been made available because dmaengine_pcm didn't support packed data transfers. bcm2835-i2s needs 16-bit left+right channel data to be packed into a 32-bit word, the FIFO register is 32-bit only and doesn't support 16-bit access. Now that dmaengine_pcm supports packed transfers the format can be made available by setting the SND_DMAENGINE_PCM_DAI_FLAG_PACK flag. No further configuration is necessary: - snd_dmaengine_dai_dma_data.addr_width is already set to DMA_SLAVE_BUSWIDTH_4_BYTES to force 32-bit DMA transfers - dmaengine_pcm will pick up the S16_LE format from the DAI configuration and make it available since it's no longer masked out due to the PACK flag. - there are no further corner cases to catch in hw_params, since the channel count is fixed at 2 we always have two 16-bit stereo samples that can be transferred via 32-bit DMA Signed-off-by: Matthias Reichl <hias@horus.com> Tested-by: Martin Sperl <kernel@martin.sperl.org> Signed-off-by: Mark Brown <broonie@kernel.org>		2016-04-27 17:35:53 +01:00
..
bcm2835-i2s.c	ASoC: bcm2835: Add S16_LE support via packed DMA transfers	2016-04-27 17:35:53 +01:00
Kconfig	ASoC: bcm: Remove obsoleted Kconfig dependency	2014-01-08 20:00:04 +00:00
Makefile