ASoC: SOF: ipc4/Intel: Add support for library restore firmware functionality

The firmware will be able to only save and restore the context related to
library management.
This means that even without a full context save, the libraries do not
need to be re-loaded to the firmware after second or consecutive boots.

This is reported via the FW_READY notification, where BIT(15) indicates:
0 - the library restore is not done
1 - library restore is done

This bit is only valid if full context save is not enabled, full context
save is by definition saves and restores the library related book-keeping
as well.

Add a new flag to tell the platform code if the libraries have been
restored, no need to reload them after boot.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://patch.msgid.link/20250619105623.4546-3-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/soc/sof/ipc4-loader.c b/sound/soc/sof/ipc4-loader.c
index d2f534d65edf..ee61394e73d7 100644
--- a/sound/soc/sof/ipc4-loader.c
+++ b/sound/soc/sof/ipc4-loader.c
@@ -494,6 +494,12 @@ int sof_ipc4_query_fw_configuration(struct snd_sof_dev *sdev)
 			break;
 		case SOF_IPC4_FW_CONTEXT_SAVE:
 			ipc4_data->fw_context_save = *tuple->value;
+			/*
+			 * Set the default libraries_restored value - if full
+			 * context save is supported then it means that
+			 * libraries are restored
+			 */
+			ipc4_data->libraries_restored = ipc4_data->fw_context_save;
 			break;
 		default:
 			break;