ASoC: SOF: Compile and runtime IPC version selection

The new IPC4 version is only supported by Intel platforms, iMX, AMD and
MediaTek only uses the standard SOF IPC.
There is no need for these platforms to build kernel support for IPC4 as
it is just dead code for them.

SND_SOC_SOF_IPC3 and SND_SOC_SOF_INTEL_IPC4 is introduced to allow compile
time selection and exclusion of IPC implementations.

To avoid randconfig failures add also support for runtime selection of
the IPC ops in ipc.c based on sdev->pdata->ipc_type

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20220614075618.28605-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 18 insertions, 6 deletions

diff --git a/sound/soc/sof/ipc.c b/sound/soc/sof/ipc.c
index c5aef5fc056b..6ed3f9b6a0c4 100644
--- a/sound/soc/sof/ipc.c
+++ b/sound/soc/sof/ipc.c
@@ -155,12 +155,22 @@ struct snd_sof_ipc *snd_sof_ipc_init(struct snd_sof_dev *sdev)
 
 	init_waitqueue_head(&msg->waitq);
 
-	/*
-	 * Use IPC3 ops as it is the only available version now. With the addition of new IPC
-	 * versions, this will need to be modified to use the selected version at runtime.
-	 */
-	ipc->ops = &ipc3_ops;
-	ops = ipc->ops;
+	switch (sdev->pdata->ipc_type) {
+#if defined(CONFIG_SND_SOC_SOF_IPC3)
+	case SOF_IPC:
+		ops = &ipc3_ops;
+		break;
+#endif
+#if defined(CONFIG_SND_SOC_SOF_INTEL_IPC4)
+	case SOF_INTEL_IPC4:
+		ops = &ipc4_ops;
+		break;
+#endif
+	default:
+		dev_err(sdev->dev, "Not supported IPC version: %d\n",
+			sdev->pdata->ipc_type);
+		return NULL;
+	}
 
 	/* check for mandatory ops */
 	if (!ops->tx_msg || !ops->rx_msg || !ops->set_get_data || !ops->get_reply) {
@@ -190,6 +200,8 @@ struct snd_sof_ipc *snd_sof_ipc_init(struct snd_sof_dev *sdev)
 		return NULL;
 	}
 
+	ipc->ops = ops;
+
 	return ipc;
 }
 EXPORT_SYMBOL(snd_sof_ipc_init);