31  * DOC: LPE Audio integration for HDMI or DP playback
36  * mode is unrelated to the LPE aka SST audio engine, the documentation refers
41  * subsystems, a bridge is setup between the hdmi-lpe-audio and i915:
44  * 3. Create IRQ chip to forward the LPE audio irqs.
45  * the hdmi-lpe-audio driver probes the lpe audio device and creates a new
50  * uninstall the hdmi-lpe-audio driver before uninstalling i915 module,
52  * platform device: even though hdmi-lpe-audio driver is released, the modules
58  * When forwarding LPE audio irqs, the flow control handler selection depends
80 #define HAS_LPE_AUDIO(dev_priv) ((dev_priv)->display.audio.lpe.platdev != NULL)
101 	rsc[0].start    = rsc[0].end = dev_priv->display.audio.lpe.irq;  in lpe_audio_platdev_create()
103 	rsc[0].name     = "hdmi-lpe-audio-irq";  in lpe_audio_platdev_create()
110 	rsc[1].name     = "hdmi-lpe-audio-mmio";  in lpe_audio_platdev_create()
113 	pinfo.name = "hdmi-lpe-audio";  in lpe_audio_platdev_create()
134 			"Failed to allocate LPE audio platform device\n");  in lpe_audio_platdev_create()
153 	platform_device_unregister(dev_priv->display.audio.lpe.platdev);  in lpe_audio_platdev_destroy()
172 	int irq = dev_priv->display.audio.lpe.irq;  in lpe_audio_irq_init()
198 				 "HDaudio controller not detected, using LPE audio instead\n");  in lpe_audio_detect()
209 	dev_priv->display.audio.lpe.irq = irq_alloc_desc(0);  in lpe_audio_setup()
210 	if (dev_priv->display.audio.lpe.irq < 0) {  in lpe_audio_setup()
212 			dev_priv->display.audio.lpe.irq);  in lpe_audio_setup()
213 		ret = dev_priv->display.audio.lpe.irq;  in lpe_audio_setup()
217 	drm_dbg(&dev_priv->drm, "irq = %d\n", dev_priv->display.audio.lpe.irq);  in lpe_audio_setup()
223 			"Failed to initialize irqchip for lpe audio: %d\n",  in lpe_audio_setup()
228 	dev_priv->display.audio.lpe.platdev = lpe_audio_platdev_create(dev_priv);  in lpe_audio_setup()
230 	if (IS_ERR(dev_priv->display.audio.lpe.platdev)) {  in lpe_audio_setup()
231 		ret = PTR_ERR(dev_priv->display.audio.lpe.platdev);  in lpe_audio_setup()
233 			"Failed to create lpe audio platform device: %d\n",  in lpe_audio_setup()
246 	irq_free_desc(dev_priv->display.audio.lpe.irq);  in lpe_audio_setup()
248 	dev_priv->display.audio.lpe.irq = -1;  in lpe_audio_setup()
249 	dev_priv->display.audio.lpe.platdev = NULL;  in lpe_audio_setup()
254  * intel_lpe_audio_irq_handler() - forwards the LPE audio irq
257  * the LPE Audio irq is forwarded to the irq handler registered by LPE audio
267 	ret = generic_handle_irq(dev_priv->display.audio.lpe.irq);  in intel_lpe_audio_irq_handler()
270 				    "error handling LPE audio irq: %d\n", ret);  in intel_lpe_audio_irq_handler()
274  * intel_lpe_audio_init() - detect and setup the bridge between HDMI LPE Audio
289 				"failed to setup LPE Audio bridge\n");  in intel_lpe_audio_init()
296  * audio driver and i915
299  * release all the resources for LPE audio <-> i915 bridge.
308 	irq_free_desc(dev_priv->display.audio.lpe.irq);  in intel_lpe_audio_teardown()
310 	dev_priv->display.audio.lpe.irq = -1;  in intel_lpe_audio_teardown()
311 	dev_priv->display.audio.lpe.platdev = NULL;  in intel_lpe_audio_teardown()
315  * intel_lpe_audio_notify() - notify lpe audio event
316  * audio driver and i915
324  * Notify lpe audio driver of eld change.
338 	pdata = dev_get_platdata(&dev_priv->display.audio.lpe.platdev->dev);  in intel_lpe_audio_notify()
366 		pdata->notify_audio_lpe(dev_priv->display.audio.lpe.platdev, port - PORT_B);  in intel_lpe_audio_notify()