[PATCH] ASoC: qdsp6: audioreach: Add ADSP ready check

[Srinivasa Rao Mandadapu <quic_srivasam@xxxxxxxxxxx>]

Check for SPF readiness in prm driver probe to avoid race conditions
during ADSP pil loading.
This patch is to avoid, sending requests to ADSP before it's
power domains are up and ready.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@xxxxxxxxxxx>
Tested-by: Ratna Deepthi Kudaravalli <rkudarav@xxxxxxxxxxxxxxxx>
---
 sound/soc/qcom/qdsp6/q6apm.c | 13 +++++++++++++
 sound/soc/qcom/qdsp6/q6apm.h |  2 ++
 sound/soc/qcom/qdsp6/q6prm.c |  4 ++++
 3 files changed, 19 insertions(+)

diff --git a/sound/soc/qcom/qdsp6/q6apm.c b/sound/soc/qcom/qdsp6/q6apm.c
index 5beb898..8a7dfd2 100644
--- a/sound/soc/qcom/qdsp6/q6apm.c
+++ b/sound/soc/qcom/qdsp6/q6apm.c
@@ -27,6 +27,8 @@ struct apm_graph_mgmt_cmd {
 
 #define APM_GRAPH_MGMT_PSIZE(p, n) ALIGN(struct_size(p, sub_graph_id_list, n), 8)
 
+struct q6apm *g_apm;
+
 int q6apm_send_cmd_sync(struct q6apm *apm, struct gpr_pkt *pkt, uint32_t rsp_opcode)
 {
 	gpr_device_t *gdev = apm->gdev;
@@ -143,6 +145,15 @@ static void q6apm_put_audioreach_graph(struct kref *ref)
 	kfree(graph);
 }
 
+bool q6apm_is_adsp_ready(void)
+{
+	if (g_apm && g_apm->state)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(q6apm_is_adsp_ready);
+
 static int q6apm_get_apm_state(struct q6apm *apm)
 {
 	struct gpr_pkt *pkt;
@@ -658,6 +669,8 @@ static int apm_probe(gpr_device_t *gdev)
 
 	idr_init(&apm->modules_idr);
 
+	g_apm = apm;
+
 	q6apm_get_apm_state(apm);
 
 	ret = devm_snd_soc_register_component(dev, &q6apm_audio_component, NULL, 0);
diff --git a/sound/soc/qcom/qdsp6/q6apm.h b/sound/soc/qcom/qdsp6/q6apm.h
index 273f978..7005be9 100644
--- a/sound/soc/qcom/qdsp6/q6apm.h
+++ b/sound/soc/qcom/qdsp6/q6apm.h
@@ -145,4 +145,6 @@ struct audioreach_module *q6apm_find_module_by_mid(struct q6apm_graph *graph,
 void q6apm_set_fe_dai_ops(struct snd_soc_dai_driver *dai_drv);
 int q6apm_graph_get_rx_shmem_module_iid(struct q6apm_graph *graph);
 
+bool q6apm_is_adsp_ready(void);
+
 #endif /* __APM_GRAPH_ */
diff --git a/sound/soc/qcom/qdsp6/q6prm.c b/sound/soc/qcom/qdsp6/q6prm.c
index 8aa1a21..3aa63aa 100644
--- a/sound/soc/qcom/qdsp6/q6prm.c
+++ b/sound/soc/qcom/qdsp6/q6prm.c
@@ -12,6 +12,7 @@
 #include <linux/soc/qcom/apr.h>
 #include <dt-bindings/soc/qcom,gpr.h>
 #include <dt-bindings/sound/qcom,q6dsp-lpass-ports.h>
+#include "q6apm.h"
 #include "q6prm.h"
 #include "audioreach.h"
 
@@ -226,6 +227,9 @@ static int prm_probe(gpr_device_t *gdev)
 	init_waitqueue_head(&cc->wait);
 	dev_set_drvdata(dev, cc);
 
+	if (!q6apm_is_adsp_ready())
+		return -EPROBE_DEFER;
+
 	return devm_of_platform_populate(dev);
 }
 
-- 
2.7.4