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(display) ((display)->audio.lpe.platdev)
101 	rsc[0].start    = display->audio.lpe.irq;  in lpe_audio_platdev_create()
102 	rsc[0].end      = display->audio.lpe.irq;  in lpe_audio_platdev_create()
104 	rsc[0].name     = "hdmi-lpe-audio-irq";  in lpe_audio_platdev_create()
111 	rsc[1].name     = "hdmi-lpe-audio-mmio";  in lpe_audio_platdev_create()
114 	pinfo.name = "hdmi-lpe-audio";  in lpe_audio_platdev_create()
135 			"Failed to allocate LPE audio platform device\n");  in lpe_audio_platdev_create()
154 	platform_device_unregister(display->audio.lpe.platdev);  in lpe_audio_platdev_destroy()
174 	int irq = display->audio.lpe.irq;  in lpe_audio_irq_init()
200 				 "HDaudio controller not detected, using LPE audio instead\n");  in lpe_audio_detect()
211 	display->audio.lpe.irq = irq_alloc_desc(0);  in lpe_audio_setup()
212 	if (display->audio.lpe.irq < 0) {  in lpe_audio_setup()
214 			display->audio.lpe.irq);  in lpe_audio_setup()
215 		ret = display->audio.lpe.irq;  in lpe_audio_setup()
219 	drm_dbg(display->drm, "irq = %d\n", display->audio.lpe.irq);  in lpe_audio_setup()
225 			"Failed to initialize irqchip for lpe audio: %d\n",  in lpe_audio_setup()
230 	display->audio.lpe.platdev = lpe_audio_platdev_create(display);  in lpe_audio_setup()
232 	if (IS_ERR(display->audio.lpe.platdev)) {  in lpe_audio_setup()
233 		ret = PTR_ERR(display->audio.lpe.platdev);  in lpe_audio_setup()
235 			"Failed to create lpe audio platform device: %d\n",  in lpe_audio_setup()
248 	irq_free_desc(display->audio.lpe.irq);  in lpe_audio_setup()
250 	display->audio.lpe.irq = -1;  in lpe_audio_setup()
251 	display->audio.lpe.platdev = NULL;  in lpe_audio_setup()
256  * intel_lpe_audio_irq_handler() - forwards the LPE audio irq
259  * the LPE Audio irq is forwarded to the irq handler registered by LPE audio
269 	ret = generic_handle_irq(display->audio.lpe.irq);  in intel_lpe_audio_irq_handler()
272 				    "error handling LPE audio irq: %d\n", ret);  in intel_lpe_audio_irq_handler()
276  * intel_lpe_audio_init() - detect and setup the bridge between HDMI LPE Audio
291 				"failed to setup LPE Audio bridge\n");  in intel_lpe_audio_init()
298  * audio driver and i915
301  * release all the resources for LPE audio <-> i915 bridge.
310 	irq_free_desc(display->audio.lpe.irq);  in intel_lpe_audio_teardown()
312 	display->audio.lpe.irq = -1;  in intel_lpe_audio_teardown()
313 	display->audio.lpe.platdev = NULL;  in intel_lpe_audio_teardown()
317  * intel_lpe_audio_notify() - notify lpe audio event
318  * audio driver and i915
326  * Notify lpe audio driver of eld change.
340 	pdata = dev_get_platdata(&display->audio.lpe.platdev->dev);  in intel_lpe_audio_notify()
368 		pdata->notify_audio_lpe(display->audio.lpe.platdev, port - PORT_B);  in intel_lpe_audio_notify()