ASoC: Intel: Skylake: Request IRQ late only after all context are initialized

Sometimes during boot, panic is observed at sst_dsp_shim_read_unlocked().
This happens when interrupt occurs before the context is initialized. So
move the irq initialization only after the context is initialized
completely.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Pawse, GuruprasadX <guruprasadx.pawse@intel.com>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/bxt-sst.c

@@ -595,7 +595,7 @@ int bxt_sst_dsp_init(struct device *dev, void __iomem *mmio_base, int irq,
 	INIT_DELAYED_WORK(&skl->d0i3.work, bxt_set_dsp_D0i3);
 	skl->d0i3.state = SKL_DSP_D0I3_NONE;
 
-	return 0;
+	return skl_dsp_acquire_irq(sst);
 }
 EXPORT_SYMBOL_GPL(bxt_sst_dsp_init);
 

sound/soc/intel/skylake/cnl-sst.c

@@ -458,7 +458,7 @@ int cnl_sst_dsp_init(struct device *dev, void __iomem *mmio_base, int irq,
 	cnl->boot_complete = false;
 	init_waitqueue_head(&cnl->boot_wait);
 
-	return 0;
+	return skl_dsp_acquire_irq(sst);
 }
 EXPORT_SYMBOL_GPL(cnl_sst_dsp_init);
 

sound/soc/intel/skylake/skl-sst-dsp.c

@@ -435,16 +435,22 @@ struct sst_dsp *skl_dsp_ctx_init(struct device *dev,
 			return NULL;
 	}
 
+	return sst;
+}
+
+int skl_dsp_acquire_irq(struct sst_dsp *sst)
+{
+	struct sst_dsp_device *sst_dev = sst->sst_dev;
+	int ret;
+
 	/* Register the ISR */
 	ret = request_threaded_irq(sst->irq, sst->ops->irq_handler,
 		sst_dev->thread, IRQF_SHARED, "AudioDSP", sst);
-	if (ret) {
+	if (ret)
 		dev_err(sst->dev, "unable to grab threaded IRQ %d, disabling device\n",
 			       sst->irq);
-		return NULL;
-	}
 
-	return sst;
+	return ret;
 }
 
 void skl_dsp_free(struct sst_dsp *dsp)

sound/soc/intel/skylake/skl-sst-dsp.h

@@ -206,6 +206,7 @@ int skl_cldma_wait_interruptible(struct sst_dsp *ctx);
 void skl_dsp_set_state_locked(struct sst_dsp *ctx, int state);
 struct sst_dsp *skl_dsp_ctx_init(struct device *dev,
 		struct sst_dsp_device *sst_dev, int irq);
+int skl_dsp_acquire_irq(struct sst_dsp *sst);
 bool is_skl_dsp_running(struct sst_dsp *ctx);
 
 unsigned int skl_dsp_get_enabled_cores(struct sst_dsp *ctx);

sound/soc/intel/skylake/skl-sst.c

@@ -569,7 +569,7 @@ int skl_sst_dsp_init(struct device *dev, void __iomem *mmio_base, int irq,
 
 	sst->fw_ops = skl_fw_ops;
 
-	return 0;
+	return skl_dsp_acquire_irq(sst);
 }
 EXPORT_SYMBOL_GPL(skl_sst_dsp_init);