ASoC: qdsp6: audioreach: Add ADSP ready check

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@quicinc.com>
Tested-by: Ratna Deepthi Kudaravalli <rkudarav@qti.qualcomm.com>
Link: https://lore.kernel.org/r/1673508617-27410-1-git-send-email-quic_srivasam@quicinc.comSigned-off-by: Mark Brown <broonie@kernel.org>

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);

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_ */

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);
 }