Re: [PATCH v5 1/5] drm/i915: setup bridge for HDMI LPE audio driver

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On Tue, Jan 24, 2017 at 03:25:14PM +0200, Jani Nikula wrote:
> On Wed, 25 Jan 2017, Jerome Anand <jerome.anand@xxxxxxxxx> wrote:
> > Enable support for HDMI LPE audio mode on Baytrail and
> > Cherrytrail when HDaudio controller is not detected
> >
> > Setup minimum required resources during i915_driver_load:
> > 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 HDMI LPE audio irqs.
> >
> > HDMI LPE audio driver (a standalone sound driver) probes the
> > LPE audio device and creates a new sound card.
> >
> > Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
> > Signed-off-by: Jerome Anand <jerome.anand@xxxxxxxxx>
> 
> Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> 
> > ---
> >  Documentation/gpu/i915.rst             |   9 +
> >  drivers/gpu/drm/i915/Makefile          |   3 +
> >  drivers/gpu/drm/i915/i915_drv.c        |   4 +-
> >  drivers/gpu/drm/i915/i915_drv.h        |  11 ++
> >  drivers/gpu/drm/i915/i915_irq.c        |  16 ++
> >  drivers/gpu/drm/i915/i915_reg.h        |   3 +
> >  drivers/gpu/drm/i915/intel_audio.c     |  25 +++
> >  drivers/gpu/drm/i915/intel_drv.h       |   2 +
> >  drivers/gpu/drm/i915/intel_lpe_audio.c | 321 +++++++++++++++++++++++++++++++++
> >  include/drm/intel_lpe_audio.h          |  46 +++++
> >  10 files changed, 438 insertions(+), 2 deletions(-)
> >  create mode 100644 drivers/gpu/drm/i915/intel_lpe_audio.c
> >  create mode 100644 include/drm/intel_lpe_audio.h
> >
> > diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
> > index 104296d..bd9b767 100644
> > --- a/Documentation/gpu/i915.rst
> > +++ b/Documentation/gpu/i915.rst
> > @@ -225,6 +225,15 @@ Display PLLs
> >  .. kernel-doc:: drivers/gpu/drm/i915/intel_dpll_mgr.h
> >     :internal:
> >  
> > +intel hdmi lpe audio support
> > +----------------------------
> > +
> > +.. kernel-doc:: drivers/gpu/drm/i915/intel_lpe_audio.c
> > +   :doc:  LPE Audio integration for HDMI or DP playback
> > +
> > +.. kernel-doc:: drivers/gpu/drm/i915/intel_lpe_audio.c
> > +   :internal:
> > +

Please apply a follow-up patch to move this next to the chapter about hda
audio, because that makes imo more sense than just semi-randomly adding it
at the end of the chapter. And it would avoid a silly conflict with stuff
in drm-intel.git, which indeed should be here.

Thanks, Daniel

> >  Memory Management and Command Submission
> >  ========================================
> >  
> > diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> > index 74ca2e8..c62ab45 100644
> > --- a/drivers/gpu/drm/i915/Makefile
> > +++ b/drivers/gpu/drm/i915/Makefile
> > @@ -129,6 +129,9 @@ i915-y += intel_gvt.o
> >  include $(src)/gvt/Makefile
> >  endif
> >  
> > +# LPE Audio for VLV and CHT
> > +i915-y += intel_lpe_audio.o
> > +
> >  obj-$(CONFIG_DRM_I915) += i915.o
> >  
> >  CFLAGS_i915_trace_points.o := -I$(src)
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index ca168b2..2e0574c 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -1140,7 +1140,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
> >  	if (IS_GEN5(dev_priv))
> >  		intel_gpu_ips_init(dev_priv);
> >  
> > -	i915_audio_component_init(dev_priv);
> > +	intel_audio_init(dev_priv);
> >  
> >  	/*
> >  	 * Some ports require correctly set-up hpd registers for detection to
> > @@ -1158,7 +1158,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
> >   */
> >  static void i915_driver_unregister(struct drm_i915_private *dev_priv)
> >  {
> > -	i915_audio_component_cleanup(dev_priv);
> > +	intel_audio_deinit(dev_priv);
> >  
> >  	intel_gpu_ips_teardown();
> >  	acpi_video_unregister();
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 2446280..8b68f900 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -2454,6 +2454,12 @@ struct drm_i915_private {
> >  	/* Used to save the pipe-to-encoder mapping for audio */
> >  	struct intel_encoder *av_enc_map[I915_MAX_PIPES];
> >  
> > +	/* necessary resource sharing with HDMI LPE audio driver. */
> > +	struct {
> > +		struct platform_device *platdev;
> > +		int	irq;
> > +	} lpe_audio;
> > +
> >  	/*
> >  	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
> >  	 * will be rejected. Instead look for a better place.
> > @@ -3592,6 +3598,11 @@ extern int i915_restore_state(struct drm_i915_private *dev_priv);
> >  void i915_setup_sysfs(struct drm_i915_private *dev_priv);
> >  void i915_teardown_sysfs(struct drm_i915_private *dev_priv);
> >  
> > +/* intel_lpe_audio.c */
> > +int  intel_lpe_audio_init(struct drm_i915_private *dev_priv);
> > +void intel_lpe_audio_teardown(struct drm_i915_private *dev_priv);
> > +void intel_lpe_audio_irq_handler(struct drm_i915_private *dev_priv);
> > +
> >  /* intel_i2c.c */
> >  extern int intel_setup_gmbus(struct drm_i915_private *dev_priv);
> >  extern void intel_teardown_gmbus(struct drm_i915_private *dev_priv);
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> > index 6fefc34..47d6131 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -1926,6 +1926,10 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
> >  		 * signalled in iir */
> >  		valleyview_pipestat_irq_ack(dev_priv, iir, pipe_stats);
> >  
> > +		if (iir & (I915_LPE_PIPE_A_INTERRUPT |
> > +			   I915_LPE_PIPE_B_INTERRUPT))
> > +			intel_lpe_audio_irq_handler(dev_priv);
> > +
> >  		/*
> >  		 * VLV_IIR is single buffered, and reflects the level
> >  		 * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
> > @@ -2006,6 +2010,11 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
> >  		 * signalled in iir */
> >  		valleyview_pipestat_irq_ack(dev_priv, iir, pipe_stats);
> >  
> > +		if (iir & (I915_LPE_PIPE_A_INTERRUPT |
> > +			   I915_LPE_PIPE_B_INTERRUPT |
> > +			   I915_LPE_PIPE_C_INTERRUPT))
> > +			intel_lpe_audio_irq_handler(dev_priv);
> > +
> >  		/*
> >  		 * VLV_IIR is single buffered, and reflects the level
> >  		 * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
> > @@ -2948,6 +2957,7 @@ static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
> >  	u32 pipestat_mask;
> >  	u32 enable_mask;
> >  	enum pipe pipe;
> > +	u32 val;
> >  
> >  	pipestat_mask = PLANE_FLIP_DONE_INT_STATUS_VLV |
> >  			PIPE_CRC_DONE_INTERRUPT_STATUS;
> > @@ -2964,6 +2974,12 @@ static void vlv_display_irq_postinstall(struct drm_i915_private *dev_priv)
> >  
> >  	WARN_ON(dev_priv->irq_mask != ~0);
> >  
> > +	val = (I915_LPE_PIPE_A_INTERRUPT |
> > +		I915_LPE_PIPE_B_INTERRUPT |
> > +		I915_LPE_PIPE_C_INTERRUPT);
> > +
> > +	enable_mask |= val;
> > +
> >  	dev_priv->irq_mask = ~enable_mask;
> >  
> >  	GEN5_IRQ_INIT(VLV_, dev_priv->irq_mask, enable_mask);
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 72f9f36..672cb10 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -2428,6 +2428,9 @@ enum skl_disp_power_wells {
> >  #define I915_ASLE_INTERRUPT				(1<<0)
> >  #define I915_BSD_USER_INTERRUPT				(1<<25)
> >  
> > +#define I915_HDMI_LPE_AUDIO_BASE	(VLV_DISPLAY_BASE + 0x65000)
> > +#define I915_HDMI_LPE_AUDIO_SIZE	0x1000
> > +
> >  #define GEN6_BSD_RNCID			_MMIO(0x12198)
> >  
> >  #define GEN7_FF_THREAD_MODE		_MMIO(0x20a0)
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> > index 16c2027..103159d 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -956,3 +956,28 @@ void i915_audio_component_cleanup(struct drm_i915_private *dev_priv)
> >  	component_del(dev_priv->drm.dev, &i915_audio_component_bind_ops);
> >  	dev_priv->audio_component_registered = false;
> >  }
> > +
> > +/**
> > + * intel_audio_init() - Initialize the audio driver either using
> > + * component framework or using lpe audio bridge
> > + * @dev_priv: the i915 drm device private data
> > + *
> > + */
> > +void intel_audio_init(struct drm_i915_private *dev_priv)
> > +{
> > +	if (intel_lpe_audio_init(dev_priv) < 0)
> > +		i915_audio_component_init(dev_priv);
> > +}
> > +
> > +/**
> > + * intel_audio_deinit() - deinitialize the audio driver
> > + * @dev_priv: the i915 drm device private data
> > + *
> > + */
> > +void intel_audio_deinit(struct drm_i915_private *dev_priv)
> > +{
> > +	if ((dev_priv)->lpe_audio.platdev != NULL)
> > +		intel_lpe_audio_teardown(dev_priv);
> > +	else
> > +		i915_audio_component_cleanup(dev_priv);
> > +}
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 0cec001..f162881 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1225,6 +1225,8 @@ void intel_audio_codec_enable(struct intel_encoder *encoder,
> >  void intel_audio_codec_disable(struct intel_encoder *encoder);
> >  void i915_audio_component_init(struct drm_i915_private *dev_priv);
> >  void i915_audio_component_cleanup(struct drm_i915_private *dev_priv);
> > +void intel_audio_init(struct drm_i915_private *dev_priv);
> > +void intel_audio_deinit(struct drm_i915_private *dev_priv);
> >  
> >  /* intel_display.c */
> >  enum transcoder intel_crtc_pch_transcoder(struct intel_crtc *crtc);
> > diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > new file mode 100644
> > index 0000000..7ce1b5b
> > --- /dev/null
> > +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > @@ -0,0 +1,321 @@
> > +/*
> > + * 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@xxxxxxxxxxxxxxx>
> > + *    Jerome Anand <jerome.anand@xxxxxxxxx>
> > + *    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 "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);
> > +
> > +	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);
> > +
> > +	return platdev;
> > +
> > +err:
> > +	kfree(rsc);
> > +	kfree(pdata);
> > +	return ERR_PTR(ret);
> > +}
> > +
> > +static void lpe_audio_platdev_destroy(struct drm_i915_private *dev_priv)
> > +{
> > +	platform_device_unregister(dev_priv->lpe_audio.platdev);
> > +	kfree(dev_priv->lpe_audio.platdev->dev.dma_mask);
> > +}
> > +
> > +static void lpe_audio_irq_unmask(struct irq_data *d)
> > +{
> > +	struct drm_i915_private *dev_priv = d->chip_data;
> > +	unsigned long irqflags;
> > +	u32 val = (I915_LPE_PIPE_A_INTERRUPT |
> > +		I915_LPE_PIPE_B_INTERRUPT);
> > +
> > +	if (IS_CHERRYVIEW(dev_priv))
> > +		val |= I915_LPE_PIPE_C_INTERRUPT;
> > +
> > +	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> > +
> > +	dev_priv->irq_mask &= ~val;
> > +	I915_WRITE(VLV_IIR, val);
> > +	I915_WRITE(VLV_IIR, val);
> > +	I915_WRITE(VLV_IMR, dev_priv->irq_mask);
> > +	POSTING_READ(VLV_IMR);
> > +
> > +	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
> > +}
> > +
> > +static void lpe_audio_irq_mask(struct irq_data *d)
> > +{
> > +	struct drm_i915_private *dev_priv = d->chip_data;
> > +	unsigned long irqflags;
> > +	u32 val = (I915_LPE_PIPE_A_INTERRUPT |
> > +		I915_LPE_PIPE_B_INTERRUPT);
> > +
> > +	if (IS_CHERRYVIEW(dev_priv))
> > +		val |= I915_LPE_PIPE_C_INTERRUPT;
> > +
> > +	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> > +
> > +	dev_priv->irq_mask |= val;
> > +	I915_WRITE(VLV_IMR, dev_priv->irq_mask);
> > +	I915_WRITE(VLV_IIR, val);
> > +	I915_WRITE(VLV_IIR, val);
> > +	POSTING_READ(VLV_IIR);
> > +
> > +	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
> > +}
> > +
> > +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("%s\n", "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;
> > +	}
> > +
> > +	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_irq_mask(&desc->irq_data);
> > +
> > +	lpe_audio_platdev_destroy(dev_priv);
> > +
> > +	irq_free_desc(dev_priv->lpe_audio.irq);
> > +}
> > diff --git a/include/drm/intel_lpe_audio.h b/include/drm/intel_lpe_audio.h
> > new file mode 100644
> > index 0000000..952de05
> > --- /dev/null
> > +++ b/include/drm/intel_lpe_audio.h
> > @@ -0,0 +1,46 @@
> > +/*
> > + * 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.
> > + */
> > +
> > +#ifndef _INTEL_LPE_AUDIO_H_
> > +#define _INTEL_LPE_AUDIO_H_
> > +
> > +#include <linux/types.h>
> > +#include <linux/spinlock_types.h>
> > +
> > +#define HDMI_MAX_ELD_BYTES	128
> > +
> > +struct intel_hdmi_lpe_audio_eld {
> > +	int port_id;
> > +	unsigned char eld_data[HDMI_MAX_ELD_BYTES];
> > +};
> > +
> > +struct intel_hdmi_lpe_audio_pdata {
> > +	bool notify_pending;
> > +	int tmds_clock_speed;
> > +	bool hdmi_connected;
> > +	struct intel_hdmi_lpe_audio_eld eld;
> > +	void (*notify_audio_lpe)(void *audio_ptr);
> > +	spinlock_t lpe_audio_slock;
> > +};
> > +
> > +#endif /* _I915_LPE_AUDIO_H_ */
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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