From fdd85a054b850db43c6abe39c1da28b581be5e93 Mon Sep 17 00:00:00 2001 From: Hardik T Shah Date: Fri, 24 Mar 2017 23:10:32 +0530 Subject: [PATCH] ASoC: Intel: Skylake: Fix DMA position reporting for capture stream As per hardware recommendation, for every capture stream completion following operations need to be done in order to reflect the actual data that is received in position buffer. 1. Wait for 20us before reading the DMA position in buffer once the interrupt is generated for stream completion. 2. Read any of the register to flush the DMA position value. This is dummy read operation. Signed-off-by: Dharageswari R Signed-off-by: Hardik T Shah Signed-off-by: Jeeja KP Acked-by: Vinod Koul Signed-off-by: Mark Brown --- sound/soc/intel/skylake/skl-pcm.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/sound/soc/intel/skylake/skl-pcm.c b/sound/soc/intel/skylake/skl-pcm.c index ef440d8..1823197 100644 --- a/sound/soc/intel/skylake/skl-pcm.c +++ b/sound/soc/intel/skylake/skl-pcm.c @@ -21,6 +21,7 @@ #include #include +#include #include #include #include "skl.h" @@ -1063,13 +1064,31 @@ static snd_pcm_uframes_t skl_platform_pcm_pointer * HAD space reflects the actual data that is transferred. * Use the position buffer for capture, as DPIB write gets * completed earlier than the actual data written to the DDR. + * + * For capture stream following workaround is required to fix the + * incorrect position reporting. + * + * 1. Wait for 20us before reading the DMA position in buffer once + * the interrupt is generated for stream completion as update happens + * on the HDA frame boundary i.e. 20.833uSec. + * 2. Read DPIB register to flush the DMA position value. This dummy + * read is required to flush DMA position value. + * 3. Read the DMA Position-in-Buffer. This value now will be equal to + * or greater than period boundary. */ - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { pos = readl(ebus->bus.remap_addr + AZX_REG_VS_SDXDPIB_XBASE + (AZX_REG_VS_SDXDPIB_XINTERVAL * hdac_stream(hstream)->index)); - else + } else { + udelay(20); + readl(ebus->bus.remap_addr + + AZX_REG_VS_SDXDPIB_XBASE + + (AZX_REG_VS_SDXDPIB_XINTERVAL * + hdac_stream(hstream)->index)); pos = snd_hdac_stream_get_pos_posbuf(hdac_stream(hstream)); + } if (pos >= hdac_stream(hstream)->bufsize) pos = 0; -- 2.7.4