From 7bcaf0f2cdfacca2226eee8895f64bc019d5a8be Mon Sep 17 00:00:00 2001 From: Zhu Yingjiang Date: Wed, 12 Jun 2019 12:23:46 -0500 Subject: [PATCH] ASoC: SOF: Intel: hda: make sure DMA is start/stop by read the RUN bit As per the HW recommendation, after setting the RUN bit (start as 1, stop as 0), software must read the bit back to make sure the bit is set right, before modifying related control registers/re-starting the DMA engine. Signed-off-by: Zhu Yingjiang Signed-off-by: Pierre-Louis Bossart Signed-off-by: Mark Brown --- sound/soc/sof/intel/hda-stream.c | 22 ++++++++++++++++++++++ sound/soc/sof/intel/hda.h | 6 ++++++ 2 files changed, 28 insertions(+) diff --git a/sound/soc/sof/intel/hda-stream.c b/sound/soc/sof/intel/hda-stream.c index 23cff5a..13d1149 100644 --- a/sound/soc/sof/intel/hda-stream.c +++ b/sound/soc/sof/intel/hda-stream.c @@ -217,6 +217,9 @@ int hda_dsp_stream_trigger(struct snd_sof_dev *sdev, { struct hdac_stream *hstream = &stream->hstream; int sd_offset = SOF_STREAM_SD_OFFSET(hstream); + u32 dma_start = SOF_HDA_SD_CTL_DMA_START; + int ret; + u32 run; /* cmd must be for audio stream */ switch (cmd) { @@ -234,6 +237,16 @@ int hda_dsp_stream_trigger(struct snd_sof_dev *sdev, SOF_HDA_SD_CTL_DMA_START | SOF_HDA_CL_DMA_SD_INT_MASK); + ret = snd_sof_dsp_read_poll_timeout(sdev, + HDA_DSP_HDA_BAR, + sd_offset, run, + ((run & dma_start) == dma_start), + HDA_DSP_REG_POLL_INTERVAL_US, + HDA_DSP_STREAM_RUN_TIMEOUT); + + if (ret) + return ret; + hstream->running = true; break; case SNDRV_PCM_TRIGGER_SUSPEND: @@ -244,6 +257,15 @@ int hda_dsp_stream_trigger(struct snd_sof_dev *sdev, SOF_HDA_SD_CTL_DMA_START | SOF_HDA_CL_DMA_SD_INT_MASK, 0x0); + ret = snd_sof_dsp_read_poll_timeout(sdev, HDA_DSP_HDA_BAR, + sd_offset, run, + !(run & dma_start), + HDA_DSP_REG_POLL_INTERVAL_US, + HDA_DSP_STREAM_RUN_TIMEOUT); + + if (ret) + return ret; + snd_sof_dsp_write(sdev, HDA_DSP_HDA_BAR, sd_offset + SOF_HDA_ADSP_REG_CL_SD_STS, SOF_HDA_CL_DMA_SD_INT_MASK); diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h index 5065385..73d7cc0 100644 --- a/sound/soc/sof/intel/hda.h +++ b/sound/soc/sof/intel/hda.h @@ -159,6 +159,12 @@ #define HDA_DSP_MBOX_UPLINK_OFFSET 0x81000 #define HDA_DSP_STREAM_RESET_TIMEOUT 300 +/* + * Timeout in us, for setting the stream RUN bit, during + * start/stop the stream. The timeout expires if new RUN bit + * value cannot be read back within the specified time. + */ +#define HDA_DSP_STREAM_RUN_TIMEOUT 300 #define HDA_DSP_CL_TRIGGER_TIMEOUT 300 #define HDA_DSP_SPIB_ENABLE 1 -- 2.7.4