ASoC: SOF: Intel: hda: Add a helper function for stream reset

Add a helper function to perform stream reset.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20211125101520.291581-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/intel/hda-stream.c b/sound/soc/sof/intel/hda-stream.c
index b6f0378..c2895bd 100644 (file)
--- a/sound/soc/sof/intel/hda-stream.c
+++ b/sound/soc/sof/intel/hda-stream.c
@@ -279,6 +279,45 @@ int hda_dsp_stream_put(struct snd_sof_dev *sdev, int direction, int stream_tag)
        return 0;
 }
 
+static int hda_dsp_stream_reset(struct snd_sof_dev *sdev, struct hdac_stream *hstream)
+{
+       int sd_offset = SOF_STREAM_SD_OFFSET(hstream);
+       int timeout = HDA_DSP_STREAM_RESET_TIMEOUT;
+       u32 val;
+
+       /* enter stream reset */
+       snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, sd_offset, SOF_STREAM_SD_OFFSET_CRST,
+                               SOF_STREAM_SD_OFFSET_CRST);
+       do {
+               val = snd_sof_dsp_read(sdev, HDA_DSP_HDA_BAR, sd_offset);
+               if (val & SOF_STREAM_SD_OFFSET_CRST)
+                       break;
+       } while (--timeout);
+       if (timeout == 0) {
+               dev_err(sdev->dev, "timeout waiting for stream reset\n");
+               return -ETIMEDOUT;
+       }
+
+       timeout = HDA_DSP_STREAM_RESET_TIMEOUT;
+
+       /* exit stream reset and wait to read a zero before reading any other register */
+       snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, sd_offset, SOF_STREAM_SD_OFFSET_CRST, 0x0);
+
+       /* wait for hardware to report that stream is out of reset */
+       udelay(3);
+       do {
+               val = snd_sof_dsp_read(sdev, HDA_DSP_HDA_BAR, sd_offset);
+               if ((val & SOF_STREAM_SD_OFFSET_CRST) == 0)
+                       break;
+       } while (--timeout);
+       if (timeout == 0) {
+               dev_err(sdev->dev, "timeout waiting for stream to exit reset\n");
+               return -ETIMEDOUT;
+       }
+
+       return 0;
+}
+
 int hda_dsp_stream_trigger(struct snd_sof_dev *sdev,
                           struct hdac_ext_stream *stream, int cmd)
 {
@@ -436,9 +475,9 @@ int hda_dsp_stream_hw_params(struct snd_sof_dev *sdev,
        struct hdac_bus *bus = sof_to_bus(sdev);
        struct hdac_stream *hstream = &stream->hstream;
        int sd_offset = SOF_STREAM_SD_OFFSET(hstream);
-       int ret, timeout = HDA_DSP_STREAM_RESET_TIMEOUT;
+       int ret;
        u32 dma_start = SOF_HDA_SD_CTL_DMA_START;
-       u32 val, mask;
+       u32 mask;
        u32 run;
 
        if (!stream) {
@@ -483,36 +522,9 @@ int hda_dsp_stream_hw_params(struct snd_sof_dev *sdev,
                                SOF_HDA_CL_DMA_SD_INT_MASK);
 
        /* stream reset */
-       snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, sd_offset, 0x1,
-                               0x1);
-       udelay(3);
-       do {
-               val = snd_sof_dsp_read(sdev, HDA_DSP_HDA_BAR,
-                                      sd_offset);
-               if (val & 0x1)
-                       break;
-       } while (--timeout);
-       if (timeout == 0) {
-               dev_err(sdev->dev, "error: stream reset failed\n");
-               return -ETIMEDOUT;
-       }
-
-       timeout = HDA_DSP_STREAM_RESET_TIMEOUT;
-       snd_sof_dsp_update_bits(sdev, HDA_DSP_HDA_BAR, sd_offset, 0x1,
-                               0x0);
-
-       /* wait for hardware to report that stream is out of reset */
-       udelay(3);
-       do {
-               val = snd_sof_dsp_read(sdev, HDA_DSP_HDA_BAR,
-                                      sd_offset);
-               if ((val & 0x1) == 0)
-                       break;
-       } while (--timeout);
-       if (timeout == 0) {
-               dev_err(sdev->dev, "error: timeout waiting for stream reset\n");
-               return -ETIMEDOUT;
-       }
+       ret = hda_dsp_stream_reset(sdev, hstream);
+       if (ret < 0)
+               return ret;
 
        if (hstream->posbuf)
                *hstream->posbuf = 0;

diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index 8ed4031..60139ea 100644 (file)
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -487,6 +487,8 @@ struct sof_intel_hda_stream {
        (SOF_HDA_ADSP_SD_ENTRY_SIZE * ((s)->index) \
         + SOF_HDA_ADSP_LOADER_BASE)
 
+#define SOF_STREAM_SD_OFFSET_CRST 0x1
+
 /*
  * DSP Core services.
  */