[PATCH 06/12] ASoC: SOF: add a power status IPC

[Guennadi Liakhovetski]

In a virtualised configuration the runtime PM of the host and any
guests aren't synchronised. But guests have to be able to tell the
host when they suspend and resume and know, whether the host has been
runtime suspended since that guests's topology had been sent to the
host last time. This is needed to decide whether to re-send the
topology again. To support this we add a new PM IPC message
SOF_IPC_PM_VFE_POWER_STATUS and a reset counter to track the state of
the DSP.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
---
 include/sound/sof/header.h | 1 +
 sound/soc/sof/core.c       | 2 ++
 sound/soc/sof/ipc.c        | 2 ++
 sound/soc/sof/loader.c     | 4 ++++
 sound/soc/sof/sof-priv.h   | 4 ++++
 5 files changed, 13 insertions(+)

diff --git a/include/sound/sof/header.h b/include/sound/sof/header.h
index b794795..1aaccb5a 100644
--- a/include/sound/sof/header.h
+++ b/include/sound/sof/header.h
@@ -77,6 +77,7 @@
 #define SOF_IPC_PM_CLK_REQ			SOF_CMD_TYPE(0x006)
 #define SOF_IPC_PM_CORE_ENABLE			SOF_CMD_TYPE(0x007)
 #define SOF_IPC_PM_GATE				SOF_CMD_TYPE(0x008)
+#define SOF_IPC_PM_VFE_POWER_STATUS		SOF_CMD_TYPE(0x010)
 
 /* component runtime config - multiple different types */
 #define SOF_IPC_COMP_SET_VALUE			SOF_CMD_TYPE(0x001)
diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index ca30d67..42dd72e 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -8,6 +8,7 @@
 // Author: Liam Girdwood <liam.r.girdwood at linux.intel.com>
 //
 
+#include <linux/atomic.h>
 #include <linux/firmware.h>
 #include <linux/module.h>
 #include <sound/soc.h>
@@ -311,6 +312,7 @@ int snd_sof_device_probe(struct device *dev, struct snd_sof_pdata *plat_data)
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_PROBES)
 	sdev->extractor_stream_tag = SOF_PROBE_INVALID_NODE_ID;
 #endif
+	atomic_set(&sdev->reset_count, 0);
 	dev_set_drvdata(dev, sdev);
 
 	/* check all mandatory ops */
diff --git a/sound/soc/sof/ipc.c b/sound/soc/sof/ipc.c
index 6fa501c1..b0b38ca 100644
--- a/sound/soc/sof/ipc.c
+++ b/sound/soc/sof/ipc.c
@@ -105,6 +105,8 @@ static void ipc_log_header(struct device *dev, u8 *text, u32 cmd)
 			str2 = "CLK_REQ"; break;
 		case SOF_IPC_PM_CORE_ENABLE:
 			str2 = "CORE_ENABLE"; break;
+		case SOF_IPC_PM_VFE_POWER_STATUS:
+			str2 = "VFE_POWER_STATUS"; break;
 		default:
 			str2 = "unknown type"; break;
 		}
diff --git a/sound/soc/sof/loader.c b/sound/soc/sof/loader.c
index 1f2e0be..80854c9 100644
--- a/sound/soc/sof/loader.c
+++ b/sound/soc/sof/loader.c
@@ -10,6 +10,7 @@
 // Generic firmware loader.
 //
 
+#include <linux/atomic.h>
 #include <linux/firmware.h>
 #include <sound/sof.h>
 #include "ops.h"
@@ -611,6 +612,9 @@ int snd_sof_run_firmware(struct snd_sof_dev *sdev)
 	/* fw boot is complete. Update the active cores mask */
 	sdev->enabled_cores_mask = init_core_mask;
 
+	/* increment reset count */
+	atomic_add(1, &sdev->reset_count);
+
 	return 0;
 }
 EXPORT_SYMBOL(snd_sof_run_firmware);
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index 922b671..0792125 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -11,6 +11,7 @@
 #ifndef __SOUND_SOC_SOF_PRIV_H
 #define __SOUND_SOC_SOF_PRIV_H
 
+#include <linux/atomic.h>
 #include <linux/device.h>
 #include <sound/hdaudio.h>
 #include <sound/sof.h>
@@ -425,6 +426,9 @@ struct snd_sof_dev {
 	unsigned int extractor_stream_tag;
 #endif
 
+	/* VirtIO fields for host and guest */
+	atomic_t reset_count;
+
 	/* DMA for Trace */
 	struct snd_dma_buffer dmatb;
 	struct snd_dma_buffer dmatp;
-- 
1.9.3