[mirror_ubuntu-disco-kernel.git] / drivers / gpu / drm / i915 / intel_lpe_audio.c

/*
 * Copyright © 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
 *    Jerome Anand <jerome.anand@intel.com>
 *    based on VED patches
 *
 */

/**
 * DOC: LPE Audio integration for HDMI or DP playback
 *
 * Motivation:
 * Atom platforms (e.g. valleyview and cherryTrail) integrates a DMA-based
 * interface as an alternative to the traditional HDaudio path. While this
 * mode is unrelated to the LPE aka SST audio engine, the documentation refers
 * to this mode as LPE so we keep this notation for the sake of consistency.
 *
 * The interface is handled by a separate standalone driver maintained in the
 * ALSA subsystem for simplicity. To minimize the interaction between the two
 * subsystems, a bridge is setup between the hdmi-lpe-audio and i915:
 * 1. Create a platform device to share MMIO/IRQ resources
 * 2. Make the platform device child of i915 device for runtime PM.
 * 3. Create IRQ chip to forward the LPE audio irqs.
 * the hdmi-lpe-audio driver probes the lpe audio device and creates a new
 * sound card
 *
 * Threats:
 * Due to the restriction in Linux platform device model, user need manually
 * uninstall the hdmi-lpe-audio driver before uninstalling i915 module,
 * otherwise we might run into use-after-free issues after i915 removes the
 * platform device: even though hdmi-lpe-audio driver is released, the modules
 * is still in "installed" status.
 *
 * Implementation:
 * The MMIO/REG platform resources are created according to the registers
 * specification.
 * When forwarding LPE audio irqs, the flow control handler selection depends
 * on the platform, for example on valleyview handle_simple_irq is enough.
 *
 */

#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>

#include "i915_drv.h"
#include <linux/delay.h>
#include <drm/intel_lpe_audio.h>

#define HAS_LPE_AUDIO(dev_priv) ((dev_priv)->lpe_audio.platdev != NULL)

static struct platform_device *
lpe_audio_platdev_create(struct drm_i915_private *dev_priv)
{
	int ret;
	struct drm_device *dev = &dev_priv->drm;
	struct platform_device_info pinfo = {};
	struct resource *rsc;
	struct platform_device *platdev;
	struct intel_hdmi_lpe_audio_pdata *pdata;

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	rsc = kcalloc(2, sizeof(*rsc), GFP_KERNEL);
	if (!rsc) {
		kfree(pdata);
		return ERR_PTR(-ENOMEM);
	}

	rsc[0].start    = rsc[0].end = dev_priv->lpe_audio.irq;
	rsc[0].flags    = IORESOURCE_IRQ;
	rsc[0].name     = "hdmi-lpe-audio-irq";

	rsc[1].start    = pci_resource_start(dev->pdev, 0) +
		I915_HDMI_LPE_AUDIO_BASE;
	rsc[1].end      = pci_resource_start(dev->pdev, 0) +
		I915_HDMI_LPE_AUDIO_BASE + I915_HDMI_LPE_AUDIO_SIZE - 1;
	rsc[1].flags    = IORESOURCE_MEM;
	rsc[1].name     = "hdmi-lpe-audio-mmio";

	pinfo.parent = dev->dev;
	pinfo.name = "hdmi-lpe-audio";
	pinfo.id = -1;
	pinfo.res = rsc;
	pinfo.num_res = 2;
	pinfo.data = pdata;
	pinfo.size_data = sizeof(*pdata);
	pinfo.dma_mask = DMA_BIT_MASK(32);

	pdata->num_pipes = INTEL_INFO(dev_priv)->num_pipes;
	pdata->num_ports = IS_CHERRYVIEW(dev_priv) ? 3 : 2; /* B,C,D or B,C */
	pdata->port[0].pipe = -1;
	pdata->port[1].pipe = -1;
	pdata->port[2].pipe = -1;
	spin_lock_init(&pdata->lpe_audio_slock);

	platdev = platform_device_register_full(&pinfo);
	if (IS_ERR(platdev)) {
		ret = PTR_ERR(platdev);
		DRM_ERROR("Failed to allocate LPE audio platform device\n");
		goto err;
	}

	kfree(rsc);

	pm_runtime_forbid(&platdev->dev);
	pm_runtime_set_active(&platdev->dev);
	pm_runtime_enable(&platdev->dev);

	return platdev;

err:
	kfree(rsc);
	kfree(pdata);
	return ERR_PTR(ret);
}

static void lpe_audio_platdev_destroy(struct drm_i915_private *dev_priv)
{
	/* XXX Note that platform_device_register_full() allocates a dma_mask
	 * and never frees it. We can't free it here as we cannot guarantee
	 * this is the last reference (i.e. that the dma_mask will not be
	 * used after our unregister). So ee choose to leak the sizeof(u64)
	 * allocation here - it should be fixed in the platform_device rather
	 * than us fiddle with its internals.
	 */

	platform_device_unregister(dev_priv->lpe_audio.platdev);
}

static void lpe_audio_irq_unmask(struct irq_data *d)
{
}

static void lpe_audio_irq_mask(struct irq_data *d)
{
}

static struct irq_chip lpe_audio_irqchip = {
	.name = "hdmi_lpe_audio_irqchip",
	.irq_mask = lpe_audio_irq_mask,
	.irq_unmask = lpe_audio_irq_unmask,
};

static int lpe_audio_irq_init(struct drm_i915_private *dev_priv)
{
	int irq = dev_priv->lpe_audio.irq;

	WARN_ON(!intel_irqs_enabled(dev_priv));
	irq_set_chip_and_handler_name(irq,
				&lpe_audio_irqchip,
				handle_simple_irq,
				"hdmi_lpe_audio_irq_handler");

	return irq_set_chip_data(irq, dev_priv);
}

static bool lpe_audio_detect(struct drm_i915_private *dev_priv)
{
	int lpe_present = false;

	if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
		static const struct pci_device_id atom_hdaudio_ids[] = {
			/* Baytrail */
			{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0f04)},
			/* Braswell */
			{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2284)},
			{}
		};

		if (!pci_dev_present(atom_hdaudio_ids)) {
			DRM_INFO("HDaudio controller not detected, using LPE audio instead\n");
			lpe_present = true;
		}
	}
	return lpe_present;
}

static int lpe_audio_setup(struct drm_i915_private *dev_priv)
{
	int ret;

	dev_priv->lpe_audio.irq = irq_alloc_desc(0);
	if (dev_priv->lpe_audio.irq < 0) {
		DRM_ERROR("Failed to allocate IRQ desc: %d\n",
			dev_priv->lpe_audio.irq);
		ret = dev_priv->lpe_audio.irq;
		goto err;
	}

	DRM_DEBUG("irq = %d\n", dev_priv->lpe_audio.irq);

	ret = lpe_audio_irq_init(dev_priv);

	if (ret) {
		DRM_ERROR("Failed to initialize irqchip for lpe audio: %d\n",
			ret);
		goto err_free_irq;
	}

	dev_priv->lpe_audio.platdev = lpe_audio_platdev_create(dev_priv);

	if (IS_ERR(dev_priv->lpe_audio.platdev)) {
		ret = PTR_ERR(dev_priv->lpe_audio.platdev);
		DRM_ERROR("Failed to create lpe audio platform device: %d\n",
			ret);
		goto err_free_irq;
	}

	/* enable chicken bit; at least this is required for Dell Wyse 3040
	 * with DP outputs (but only sometimes by some reason!)
	 */
	I915_WRITE(VLV_AUD_CHICKEN_BIT_REG, VLV_CHICKEN_BIT_DBG_ENABLE);

	return 0;
err_free_irq:
	irq_free_desc(dev_priv->lpe_audio.irq);
err:
	dev_priv->lpe_audio.irq = -1;
	dev_priv->lpe_audio.platdev = NULL;
	return ret;
}

/**
 * intel_lpe_audio_irq_handler() - forwards the LPE audio irq
 * @dev_priv: the i915 drm device private data
 *
 * the LPE Audio irq is forwarded to the irq handler registered by LPE audio
 * driver.
 */
void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv)
{
	int ret;

	if (!HAS_LPE_AUDIO(dev_priv))
		return;

	ret = generic_handle_irq(dev_priv->lpe_audio.irq);
	if (ret)
		DRM_ERROR_RATELIMITED("error handling LPE audio irq: %d\n",
				ret);
}

/**
 * intel_lpe_audio_init() - detect and setup the bridge between HDMI LPE Audio
 * driver and i915
 * @dev_priv: the i915 drm device private data
 *
 * Return: 0 if successful. non-zero if detection or
 * llocation/initialization fails
 */
int intel_lpe_audio_init(struct drm_i915_private *dev_priv)
{
	int ret = -ENODEV;

	if (lpe_audio_detect(dev_priv)) {
		ret = lpe_audio_setup(dev_priv);
		if (ret < 0)
			DRM_ERROR("failed to setup LPE Audio bridge\n");
	}
	return ret;
}

/**
 * intel_lpe_audio_teardown() - destroy the bridge between HDMI LPE
 * audio driver and i915
 * @dev_priv: the i915 drm device private data
 *
 * release all the resources for LPE audio <-> i915 bridge.
 */
void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv)
{
	struct irq_desc *desc;

	if (!HAS_LPE_AUDIO(dev_priv))
		return;

	desc = irq_to_desc(dev_priv->lpe_audio.irq);

	lpe_audio_platdev_destroy(dev_priv);

	irq_free_desc(dev_priv->lpe_audio.irq);
}


/**
 * intel_lpe_audio_notify() - notify lpe audio event
 * audio driver and i915
 * @dev_priv: the i915 drm device private data
 * @pipe: pipe
 * @port: port
 * @eld : ELD data
 * @ls_clock: Link symbol clock in kHz
 * @dp_output: Driving a DP output?
 *
 * Notify lpe audio driver of eld change.
 */
void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
			    enum pipe pipe, enum port port,
			    const void *eld, int ls_clock, bool dp_output)
{
	unsigned long irqflags;
	struct intel_hdmi_lpe_audio_pdata *pdata;
	struct intel_hdmi_lpe_audio_port_pdata *ppdata;
	u32 audio_enable;

	if (!HAS_LPE_AUDIO(dev_priv))
		return;

	pdata = dev_get_platdata(&dev_priv->lpe_audio.platdev->dev);
	ppdata = &pdata->port[port - PORT_B];

	spin_lock_irqsave(&pdata->lpe_audio_slock, irqflags);

	audio_enable = I915_READ(VLV_AUD_PORT_EN_DBG(port));

	if (eld != NULL) {
		memcpy(ppdata->eld, eld, HDMI_MAX_ELD_BYTES);
		ppdata->pipe = pipe;
		ppdata->ls_clock = ls_clock;
		ppdata->dp_output = dp_output;

		/* Unmute the amp for both DP and HDMI */
		I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
			   audio_enable & ~VLV_AMP_MUTE);
	} else {
		memset(ppdata->eld, 0, HDMI_MAX_ELD_BYTES);
		ppdata->pipe = -1;
		ppdata->ls_clock = 0;
		ppdata->dp_output = false;

		/* Mute the amp for both DP and HDMI */
		I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
			   audio_enable | VLV_AMP_MUTE);
	}

	if (pdata->notify_audio_lpe)
		pdata->notify_audio_lpe(dev_priv->lpe_audio.platdev, port - PORT_B);

	spin_unlock_irqrestore(&pdata->lpe_audio_slock, irqflags);
}
Commit	Line	Data
eef57324 JA	1	/*
	2	* Copyright © 2016 Intel Corporation
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice (including the next
	12	* paragraph) shall be included in all copies or substantial portions of the
	13	* Software.
	14	*
	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	16	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	18	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	19	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	20	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
	21	* IN THE SOFTWARE.
	22	*
	23	* Authors:
	24	* Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
	25	* Jerome Anand <jerome.anand@intel.com>
	26	* based on VED patches
	27	*
	28	*/
	29
	30	/**
	31	* DOC: LPE Audio integration for HDMI or DP playback
	32	*
	33	* Motivation:
	34	* Atom platforms (e.g. valleyview and cherryTrail) integrates a DMA-based
	35	* interface as an alternative to the traditional HDaudio path. While this
	36	* mode is unrelated to the LPE aka SST audio engine, the documentation refers
	37	* to this mode as LPE so we keep this notation for the sake of consistency.
	38	*
	39	* The interface is handled by a separate standalone driver maintained in the
	40	* ALSA subsystem for simplicity. To minimize the interaction between the two
	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
	46	* sound card
	47	*
	48	* Threats:
	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
	53	* is still in "installed" status.
	54	*
	55	* Implementation:
	56	* The MMIO/REG platform resources are created according to the registers
	57	* specification.
	58	* When forwarding LPE audio irqs, the flow control handler selection depends
	59	* on the platform, for example on valleyview handle_simple_irq is enough.
	60	*
	61	*/
	62
	63	#include <linux/acpi.h>
	64	#include <linux/device.h>
65	#include <linux/pci.h>
183c0035	66	#include <linux/pm_runtime.h>
eef57324 JA	67
	68	#include "i915_drv.h"
	69	#include <linux/delay.h>
	70	#include <drm/intel_lpe_audio.h>
	71
	72	#define HAS_LPE_AUDIO(dev_priv) ((dev_priv)->lpe_audio.platdev != NULL)
	73
	74	static struct platform_device *
	75	lpe_audio_platdev_create(struct drm_i915_private *dev_priv)
	76	{
	77	int ret;
	78	struct drm_device *dev = &dev_priv->drm;
	79	struct platform_device_info pinfo = {};
	80	struct resource *rsc;
	81	struct platform_device *platdev;
	82	struct intel_hdmi_lpe_audio_pdata *pdata;
	83
	84	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	85	if (!pdata)
	86	return ERR_PTR(-ENOMEM);
	87
	88	rsc = kcalloc(2, sizeof(*rsc), GFP_KERNEL);
	89	if (!rsc) {
	90	kfree(pdata);
	91	return ERR_PTR(-ENOMEM);
	92	}
	93
	94	rsc[0].start = rsc[0].end = dev_priv->lpe_audio.irq;
	95	rsc[0].flags = IORESOURCE_IRQ;
	96	rsc[0].name = "hdmi-lpe-audio-irq";
	97
	98	rsc[1].start = pci_resource_start(dev->pdev, 0) +
	99	I915_HDMI_LPE_AUDIO_BASE;
	100	rsc[1].end = pci_resource_start(dev->pdev, 0) +
	101	I915_HDMI_LPE_AUDIO_BASE + I915_HDMI_LPE_AUDIO_SIZE - 1;
	102	rsc[1].flags = IORESOURCE_MEM;
	103	rsc[1].name = "hdmi-lpe-audio-mmio";
	104
	105	pinfo.parent = dev->dev;
	106	pinfo.name = "hdmi-lpe-audio";
	107	pinfo.id = -1;
	108	pinfo.res = rsc;
	109	pinfo.num_res = 2;
	110	pinfo.data = pdata;
	111	pinfo.size_data = sizeof(*pdata);
	112	pinfo.dma_mask = DMA_BIT_MASK(32);
	113
8a2d6ae1 VS	114	pdata->num_pipes = INTEL_INFO(dev_priv)->num_pipes;
	115	pdata->num_ports = IS_CHERRYVIEW(dev_priv) ? 3 : 2; /* B,C,D or B,C */
	116	pdata->port[0].pipe = -1;
	117	pdata->port[1].pipe = -1;
	118	pdata->port[2].pipe = -1;
eef57324 JA	119	spin_lock_init(&pdata->lpe_audio_slock);
	120
	121	platdev = platform_device_register_full(&pinfo);
	122	if (IS_ERR(platdev)) {
	123	ret = PTR_ERR(platdev);
	124	DRM_ERROR("Failed to allocate LPE audio platform device\n");
	125	goto err;
	126	}
	127
	128	kfree(rsc);
	129
183c0035 VS	130	pm_runtime_forbid(&platdev->dev);
	131	pm_runtime_set_active(&platdev->dev);
	132	pm_runtime_enable(&platdev->dev);
	133
eef57324 JA	134	return platdev;
	135
	136	err:
	137	kfree(rsc);
	138	kfree(pdata);
	139	return ERR_PTR(ret);
	140	}
	141
	142	static void lpe_audio_platdev_destroy(struct drm_i915_private *dev_priv)
	143	{
48ae8074 CW	144	/* XXX Note that platform_device_register_full() allocates a dma_mask
	145	* and never frees it. We can't free it here as we cannot guarantee
	146	* this is the last reference (i.e. that the dma_mask will not be
	147	* used after our unregister). So ee choose to leak the sizeof(u64)
	148	* allocation here - it should be fixed in the platform_device rather
	149	* than us fiddle with its internals.
	150	*/
	151
eef57324	152	platform_device_unregister(dev_priv->lpe_audio.platdev);
eef57324 JA	153	}
	154
	155	static void lpe_audio_irq_unmask(struct irq_data *d)
	156	{
eef57324 JA	157	}
	158
	159	static void lpe_audio_irq_mask(struct irq_data *d)
	160	{
eef57324 JA	161	}
	162
	163	static struct irq_chip lpe_audio_irqchip = {
	164	.name = "hdmi_lpe_audio_irqchip",
	165	.irq_mask = lpe_audio_irq_mask,
	166	.irq_unmask = lpe_audio_irq_unmask,
	167	};
	168
	169	static int lpe_audio_irq_init(struct drm_i915_private *dev_priv)
	170	{
	171	int irq = dev_priv->lpe_audio.irq;
	172
	173	WARN_ON(!intel_irqs_enabled(dev_priv));
	174	irq_set_chip_and_handler_name(irq,
	175	&lpe_audio_irqchip,
	176	handle_simple_irq,
	177	"hdmi_lpe_audio_irq_handler");
	178
	179	return irq_set_chip_data(irq, dev_priv);
	180	}
	181
	182	static bool lpe_audio_detect(struct drm_i915_private *dev_priv)
	183	{
	184	int lpe_present = false;
	185
	186	if (IS_VALLEYVIEW(dev_priv) \|\| IS_CHERRYVIEW(dev_priv)) {
	187	static const struct pci_device_id atom_hdaudio_ids[] = {
	188	/* Baytrail */
	189	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0f04)},
	190	/* Braswell */
	191	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2284)},
	192	{}
	193	};
	194
	195	if (!pci_dev_present(atom_hdaudio_ids)) {
e0795606	196	DRM_INFO("HDaudio controller not detected, using LPE audio instead\n");
eef57324 JA	197	lpe_present = true;
	198	}
	199	}
	200	return lpe_present;
	201	}
	202
	203	static int lpe_audio_setup(struct drm_i915_private *dev_priv)
	204	{
	205	int ret;
	206
	207	dev_priv->lpe_audio.irq = irq_alloc_desc(0);
	208	if (dev_priv->lpe_audio.irq < 0) {
	209	DRM_ERROR("Failed to allocate IRQ desc: %d\n",
	210	dev_priv->lpe_audio.irq);
	211	ret = dev_priv->lpe_audio.irq;
	212	goto err;
	213	}
	214
	215	DRM_DEBUG("irq = %d\n", dev_priv->lpe_audio.irq);
	216
	217	ret = lpe_audio_irq_init(dev_priv);
	218
	219	if (ret) {
	220	DRM_ERROR("Failed to initialize irqchip for lpe audio: %d\n",
	221	ret);
	222	goto err_free_irq;
	223	}
	224
	225	dev_priv->lpe_audio.platdev = lpe_audio_platdev_create(dev_priv);
	226
	227	if (IS_ERR(dev_priv->lpe_audio.platdev)) {
	228	ret = PTR_ERR(dev_priv->lpe_audio.platdev);
	229	DRM_ERROR("Failed to create lpe audio platform device: %d\n",
	230	ret);
	231	goto err_free_irq;
	232	}
	233
9db13e5f TI	234	/* enable chicken bit; at least this is required for Dell Wyse 3040
	235	* with DP outputs (but only sometimes by some reason!)
	236	*/
	237	I915_WRITE(VLV_AUD_CHICKEN_BIT_REG, VLV_CHICKEN_BIT_DBG_ENABLE);
	238
eef57324 JA	239	return 0;
	240	err_free_irq:
	241	irq_free_desc(dev_priv->lpe_audio.irq);
	242	err:
	243	dev_priv->lpe_audio.irq = -1;
	244	dev_priv->lpe_audio.platdev = NULL;
	245	return ret;
	246	}
	247
	248	/**
	249	* intel_lpe_audio_irq_handler() - forwards the LPE audio irq
	250	* @dev_priv: the i915 drm device private data
	251	*
	252	* the LPE Audio irq is forwarded to the irq handler registered by LPE audio
	253	* driver.
	254	*/
	255	void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv)
	256	{
	257	int ret;
	258
	259	if (!HAS_LPE_AUDIO(dev_priv))
	260	return;
	261
	262	ret = generic_handle_irq(dev_priv->lpe_audio.irq);
	263	if (ret)
	264	DRM_ERROR_RATELIMITED("error handling LPE audio irq: %d\n",
	265	ret);
	266	}
	267
	268	/**
	269	* intel_lpe_audio_init() - detect and setup the bridge between HDMI LPE Audio
	270	* driver and i915
	271	* @dev_priv: the i915 drm device private data
	272	*
	273	* Return: 0 if successful. non-zero if detection or
	274	* llocation/initialization fails
	275	*/
	276	int intel_lpe_audio_init(struct drm_i915_private *dev_priv)
	277	{
	278	int ret = -ENODEV;
	279
	280	if (lpe_audio_detect(dev_priv)) {
	281	ret = lpe_audio_setup(dev_priv);
	282	if (ret < 0)
	283	DRM_ERROR("failed to setup LPE Audio bridge\n");
	284	}
	285	return ret;
	286	}
	287
	288	/**
	289	* intel_lpe_audio_teardown() - destroy the bridge between HDMI LPE
	290	* audio driver and i915
	291	* @dev_priv: the i915 drm device private data
	292	*
	293	* release all the resources for LPE audio <-> i915 bridge.
	294	*/
	295	void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv)
	296	{
	297	struct irq_desc *desc;
	298
	299	if (!HAS_LPE_AUDIO(dev_priv))
	300	return;
	301
	302	desc = irq_to_desc(dev_priv->lpe_audio.irq);
303
eef57324 JA	304	lpe_audio_platdev_destroy(dev_priv);
	305
	306	irq_free_desc(dev_priv->lpe_audio.irq);
	307	}
46d196ec JA	308
	309
	310	/**
	311	* intel_lpe_audio_notify() - notify lpe audio event
	312	* audio driver and i915
	313	* @dev_priv: the i915 drm device private data
20be551e VS	314	* @pipe: pipe
20be551e VS	315	* @port: port
46d196ec	316	* @eld : ELD data
c98ec5ba VS	317	* @ls_clock: Link symbol clock in kHz
c98ec5ba VS	318	* @dp_output: Driving a DP output?
46d196ec JA	319	*
	320	* Notify lpe audio driver of eld change.
	321	*/
	322	void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
20be551e VS	323	enum pipe pipe, enum port port,
20be551e VS	324	const void *eld, int ls_clock, bool dp_output)
46d196ec	325	{
8a2d6ae1	326	unsigned long irqflags;
a8562e4d VS	327	struct intel_hdmi_lpe_audio_pdata *pdata;
a8562e4d VS	328	struct intel_hdmi_lpe_audio_port_pdata *ppdata;
d5d8c3a1	329	u32 audio_enable;
46d196ec JA	330
	331	if (!HAS_LPE_AUDIO(dev_priv))
	332	return;
	333
a8562e4d	334	pdata = dev_get_platdata(&dev_priv->lpe_audio.platdev->dev);
8a2d6ae1	335	ppdata = &pdata->port[port - PORT_B];
46d196ec	336
8a2d6ae1	337	spin_lock_irqsave(&pdata->lpe_audio_slock, irqflags);
46d196ec	338
d5d8c3a1 PLB	339	audio_enable = I915_READ(VLV_AUD_PORT_EN_DBG(port));
d5d8c3a1 PLB	340
46d196ec	341	if (eld != NULL) {
a8562e4d VS	342	memcpy(ppdata->eld, eld, HDMI_MAX_ELD_BYTES);
	343	ppdata->pipe = pipe;
	344	ppdata->ls_clock = ls_clock;
	345	ppdata->dp_output = dp_output;
d5d8c3a1 PLB	346
	347	/* Unmute the amp for both DP and HDMI */
	348	I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
	349	audio_enable & ~VLV_AMP_MUTE);
46d196ec	350	} else {
a8562e4d VS	351	memset(ppdata->eld, 0, HDMI_MAX_ELD_BYTES);
	352	ppdata->pipe = -1;
	353	ppdata->ls_clock = 0;
	354	ppdata->dp_output = false;
d5d8c3a1 PLB	355
	356	/* Mute the amp for both DP and HDMI */
	357	I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
	358	audio_enable \| VLV_AMP_MUTE);
46d196ec JA	359	}
	360
	361	if (pdata->notify_audio_lpe)
8a2d6ae1	362	pdata->notify_audio_lpe(dev_priv->lpe_audio.platdev, port - PORT_B);
46d196ec	363
8a2d6ae1	364	spin_unlock_irqrestore(&pdata->lpe_audio_slock, irqflags);
46d196ec	365	}