24  *    Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
34  * Atom platforms (e.g. valleyview and cherryTrail) integrates a DMA-based
41  * subsystems, a bridge is setup between the hdmi-lpe-audio and i915:
42  * 1. Create a platform device to share MMIO/IRQ resources
43  * 2. Make the platform device child of i915 device for runtime PM.
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
49  * Due to the restriction in Linux platform device model, user need manually
50  * uninstall the hdmi-lpe-audio driver before uninstalling i915 module,
51  * otherwise we might run into use-after-free issues after i915 removes the
52  * platform device: even though hdmi-lpe-audio driver is released, the modules
65 #include <linux/device.h>
66 #include <linux/irq.h>
80 #define HAS_LPE_AUDIO(display) ((display)->audio.lpe.platdev)
85 	struct pci_dev *pdev = to_pci_dev(display->drm->dev);  in lpe_audio_platdev_create()
93 		return ERR_PTR(-ENOMEM);  in lpe_audio_platdev_create()
98 		return ERR_PTR(-ENOMEM);  in lpe_audio_platdev_create()
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()
109 		I915_HDMI_LPE_AUDIO_BASE + I915_HDMI_LPE_AUDIO_SIZE - 1;  in lpe_audio_platdev_create()
111 	rsc[1].name     = "hdmi-lpe-audio-mmio";  in lpe_audio_platdev_create()
113 	pinfo.parent = display->drm->dev;  in lpe_audio_platdev_create()
114 	pinfo.name = "hdmi-lpe-audio";  in lpe_audio_platdev_create()
115 	pinfo.id = -1;  in lpe_audio_platdev_create()
122 	pdata->num_pipes = INTEL_NUM_PIPES(display);  in lpe_audio_platdev_create()
123 	pdata->num_ports = display->platform.cherryview ? 3 : 2; /* B,C,D or B,C */  in lpe_audio_platdev_create()
124 	pdata->port[0].pipe = -1;  in lpe_audio_platdev_create()
125 	pdata->port[1].pipe = -1;  in lpe_audio_platdev_create()
126 	pdata->port[2].pipe = -1;  in lpe_audio_platdev_create()
127 	spin_lock_init(&pdata->lpe_audio_slock);  in lpe_audio_platdev_create()
134 		drm_err(display->drm,  in lpe_audio_platdev_create()
135 			"Failed to allocate LPE audio platform device\n");  in lpe_audio_platdev_create()
139 	pm_runtime_no_callbacks(&platdev->dev);  in lpe_audio_platdev_create()
150 	 * allocation here - it should be fixed in the platform_device rather  in lpe_audio_platdev_destroy()
154 	platform_device_unregister(display->audio.lpe.platdev);  in lpe_audio_platdev_destroy()
173 	struct drm_i915_private *dev_priv = to_i915(display->drm);  in lpe_audio_irq_init()
174 	int irq = display->audio.lpe.irq;  in lpe_audio_irq_init()  local
176 	drm_WARN_ON(display->drm, !intel_irqs_enabled(dev_priv));  in lpe_audio_irq_init()
177 	irq_set_chip_and_handler_name(irq,  in lpe_audio_irq_init()
182 	return irq_set_chip_data(irq, dev_priv);  in lpe_audio_irq_init()
189 	if (display->platform.valleyview || display->platform.cherryview) {  in lpe_audio_detect()
199 			drm_info(display->drm,  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()
213 		drm_err(display->drm, "Failed to allocate IRQ desc: %d\n",  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()
224 		drm_err(display->drm,  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()
234 		drm_err(display->drm,  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
257  * @display: display device
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()
271 		drm_err_ratelimited(display->drm,  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
278  * @display: display device
280  * Return: 0 if successful. non-zero if detection or
285 	int ret = -ENODEV;  in intel_lpe_audio_init()
290 			drm_err(display->drm,  in intel_lpe_audio_init()
297  * intel_lpe_audio_teardown() - destroy the bridge between HDMI LPE
299  * @display: display device
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
319  * @display: display device
340 	pdata = dev_get_platdata(&display->audio.lpe.platdev->dev);  in intel_lpe_audio_notify()
341 	ppdata = &pdata->port[port - PORT_B];  in intel_lpe_audio_notify()
343 	spin_lock_irqsave(&pdata->lpe_audio_slock, irqflags);  in intel_lpe_audio_notify()
348 		memcpy(ppdata->eld, eld, HDMI_MAX_ELD_BYTES);  in intel_lpe_audio_notify()
349 		ppdata->pipe = cpu_transcoder;  in intel_lpe_audio_notify()
350 		ppdata->ls_clock = ls_clock;  in intel_lpe_audio_notify()
351 		ppdata->dp_output = dp_output;  in intel_lpe_audio_notify()
357 		memset(ppdata->eld, 0, HDMI_MAX_ELD_BYTES);  in intel_lpe_audio_notify()
358 		ppdata->pipe = -1;  in intel_lpe_audio_notify()
359 		ppdata->ls_clock = 0;  in intel_lpe_audio_notify()
360 		ppdata->dp_output = false;  in intel_lpe_audio_notify()
367 	if (pdata->notify_audio_lpe)  in intel_lpe_audio_notify()
368 		pdata->notify_audio_lpe(display->audio.lpe.platdev, port - PORT_B);  in intel_lpe_audio_notify()
370 	spin_unlock_irqrestore(&pdata->lpe_audio_slock, irqflags);  in intel_lpe_audio_notify()