ASoC: SOF: Add dsp_max_burst_size_in_ms member to snd_sof_pcm_stream

commit fb9f8125ed9d9b8e11f309a7dbfbe7b40de48fba upstream.

The dsp_max_burst_size_in_ms can be used to save the length of the maximum
burst size in ms the host DMA will use.

Platform code can place constraint using this to avoid user space
requesting too small ALSA buffer which will result xruns.

Cc: stable@vger.kernel.org # 6.8
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240321130814.4412-2-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/sof/sof-audio.h b/sound/soc/sof/sof-audio.h
index 8874ee5f557fb3892d1571730a6ffc4e12131246..333e04a9f525297ae73da4ace3529776cb7ae7ab 100644 (file)
--- a/sound/soc/sof/sof-audio.h
+++ b/sound/soc/sof/sof-audio.h
@@ -321,6 +321,7 @@ struct snd_sof_pcm_stream {
        struct work_struct period_elapsed_work;
        struct snd_soc_dapm_widget_list *list; /* list of connected DAPM widgets */
        bool d0i3_compatible; /* DSP can be in D0I3 when this pcm is opened */
+       unsigned int dsp_max_burst_size_in_ms; /* The maximum size of the host DMA burst in ms */
        /*
         * flag to indicate that the DSP pipelines should be kept
         * active or not while suspending the stream