With the new state we can make sure we are not missing the first host_offset update.

In case the dtrace is small, the DMA copy will be fast and depending on the moonphase it might be done before we set the sdev->dtrace_state to SOF_DTRACE_ENABLED.

The DMA will start the copy as soon as the host starts the DMA. Set the dtrace to enabled before we let the DMA to run in order to avoid missing the position update.

The new state is needed to cover architectures where the host side snd_sof_dma_trace_trigger() is a NOP and the dtrace in the firmware is ready as soon as the IPC message has been processed.

Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com --- sound/soc/sof/ipc3-dtrace.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sof/ipc3-dtrace.c b/sound/soc/sof/ipc3-dtrace.c index b4e1343f9138..9292ff7ce1e8 100644 --- a/sound/soc/sof/ipc3-dtrace.c +++ b/sound/soc/sof/ipc3-dtrace.c @@ -18,6 +18,7 @@ enum sof_dtrace_state { SOF_DTRACE_DISABLED, SOF_DTRACE_STOPPED, + SOF_DTRACE_INITIALIZING, SOF_DTRACE_ENABLED, };

@@ -32,6 +33,15 @@ struct sof_dtrace_priv { enum sof_dtrace_state dtrace_state; };

+static bool trace_pos_update_expected(struct sof_dtrace_priv *priv) +{ + if (priv->dtrace_state == SOF_DTRACE_ENABLED || + priv->dtrace_state == SOF_DTRACE_INITIALIZING) + return true; + + return false; +} + static int trace_filter_append_elem(struct snd_sof_dev *sdev, u32 key, u32 value, struct sof_ipc_trace_filter_elem *elem_list, int capacity, int *counter) @@ -274,7 +284,7 @@ static size_t sof_wait_dtrace_avail(struct snd_sof_dev *sdev, loff_t pos, if (ret) return ret;

- if (priv->dtrace_state != SOF_DTRACE_ENABLED && priv->dtrace_draining) { + if (priv->dtrace_draining && !trace_pos_update_expected(priv)) { /* * tracing has ended and all traces have been * read by client, return EOF @@ -445,6 +455,7 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev) dev_dbg(sdev->dev, "%s: stream_tag: %d\n", __func__, params.stream_tag);

/* send IPC to the DSP */ + priv->dtrace_state = SOF_DTRACE_INITIALIZING; ret = sof_ipc_tx_message(sdev->ipc, &params, sizeof(params), &ipc_reply, sizeof(ipc_reply)); if (ret < 0) { dev_err(sdev->dev, "can't set params for DMA for trace %d\n", ret); @@ -452,17 +463,18 @@ static int ipc3_dtrace_enable(struct snd_sof_dev *sdev) }

start: + priv->dtrace_state = SOF_DTRACE_ENABLED; + ret = sof_dtrace_host_trigger(sdev, SNDRV_PCM_TRIGGER_START); if (ret < 0) { dev_err(sdev->dev, "Host dtrace trigger start failed: %d\n", ret); goto trace_release; }

- priv->dtrace_state = SOF_DTRACE_ENABLED; - return 0;

trace_release: + priv->dtrace_state = SOF_DTRACE_DISABLED; sof_dtrace_host_release(sdev); return ret; } @@ -546,7 +558,7 @@ int ipc3_dtrace_posn_update(struct snd_sof_dev *sdev, if (!sdev->fw_trace_is_supported) return 0;

- if (priv->dtrace_state == SOF_DTRACE_ENABLED && + if (trace_pos_update_expected(priv) && priv->host_offset != posn->host_offset) { priv->host_offset = posn->host_offset; wake_up(&priv->trace_sleep);

If no new trace data is available then return immediately, there is no need to continue with the execution of the trace_read() function.

Signed-off-by: Peter Ujfalusi peter.ujfalusi@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com --- sound/soc/sof/ipc3-dtrace.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/sound/soc/sof/ipc3-dtrace.c b/sound/soc/sof/ipc3-dtrace.c index 1f4d7a98c8fc..f59931d818c1 100644 --- a/sound/soc/sof/ipc3-dtrace.c +++ b/sound/soc/sof/ipc3-dtrace.c @@ -353,6 +353,10 @@ static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer, return -EIO; }

+ /* no new trace data */ + if (!avail) + return 0; + /* make sure count is <= avail */ if (count > avail) count = avail;