[Intel-gfx] [RFC PATCH v2 1/8] drm/i915: setup bridge for HDMI LPE audio driver
Daniel Vetter
daniel at ffwll.ch
Mon Oct 17 06:46:18 UTC 2016
On Sat, Oct 01, 2016 at 05:52:35AM +0530, Jerome Anand 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 at linux.intel.com>
> Signed-off-by: Jerome Anand <jerome.anand at intel.com>
You need to add an include-stanza to Documentation/gpu/i915.rst,
otherwise the kerneldoc won't show up. Please also do some docs for the
structures, and then run
$ make htmldocs
to check the output looks reasonable.
Thanks, Daniel
> ---
> drivers/gpu/drm/i915/Makefile | 3 +
> drivers/gpu/drm/i915/i915_drv.c | 13 +-
> drivers/gpu/drm/i915/i915_drv.h | 19 ++
> drivers/gpu/drm/i915/i915_irq.c | 14 ++
> drivers/gpu/drm/i915/i915_reg.h | 3 +
> drivers/gpu/drm/i915/intel_lpe_audio.c | 357 +++++++++++++++++++++++++++++++++
> include/drm/intel_lpe_audio.h | 45 +++++
> 7 files changed, 452 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/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index e6fe004..11f9741 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -115,6 +115,9 @@ 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 31b2b63..ab1e4768 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1141,7 +1141,13 @@ 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);
> + if (intel_lpe_audio_detect(dev_priv)) {
> + if (intel_lpe_audio_setup(dev_priv) < 0)
> + DRM_ERROR("failed to setup LPE Audio bridge\n");
> + }
> +
> + if (!IS_LPE_AUDIO_ENABLED(dev_priv))
> + i915_audio_component_init(dev_priv);
>
> /*
> * Some ports require correctly set-up hpd registers for detection to
> @@ -1159,7 +1165,10 @@ 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);
> + if (IS_LPE_AUDIO_ENABLED(dev_priv))
> + intel_lpe_audio_teardown(dev_priv);
> + else
> + i915_audio_component_cleanup(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 91ff3d7..399a8ee 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2087,6 +2087,12 @@ 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.
> @@ -2827,6 +2833,13 @@ struct drm_i915_cmd_table {
>
> #define HAS_POOLED_EU(dev) (INTEL_INFO(dev)->has_pooled_eu)
>
> +#define HAS_LPE_AUDIO(dev) (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
> +#define IS_LPE_AUDIO_ENABLED(dev_priv) \
> + (__I915__(dev_priv)->lpe_audio.platdev != NULL)
> +#define IS_LPE_AUDIO_IRQ_VALID(dev_priv) \
> + (__I915__(dev_priv)->lpe_audio.irq >= 0)
> +
> +
> #define INTEL_PCH_DEVICE_ID_MASK 0xff00
> #define INTEL_PCH_IBX_DEVICE_ID_TYPE 0x3b00
> #define INTEL_PCH_CPT_DEVICE_ID_TYPE 0x1c00
> @@ -3579,6 +3592,12 @@ extern int i915_restore_state(struct drm_device *dev);
> void i915_setup_sysfs(struct drm_i915_private *dev_priv);
> void i915_teardown_sysfs(struct drm_i915_private *dev_priv);
>
> +/* i915_lpe_audio.c */
> +int intel_lpe_audio_setup(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);
> +int intel_lpe_audio_detect(struct drm_i915_private *dev_priv);
> +
> /* intel_i2c.c */
> extern int intel_setup_gmbus(struct drm_device *dev);
> extern void intel_teardown_gmbus(struct drm_device *dev);
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 6ed5b24..d8f515f 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1827,6 +1827,13 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
> * signalled in iir */
> valleyview_pipestat_irq_ack(dev_priv, iir, pipe_stats);
>
> + if (IS_LPE_AUDIO_ENABLED(dev_priv))
> + if (IS_LPE_AUDIO_IRQ_VALID(dev_priv))
> + 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.
> @@ -1907,6 +1914,13 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
> * signalled in iir */
> valleyview_pipestat_irq_ack(dev_priv, iir, pipe_stats);
>
> + if (IS_LPE_AUDIO_ENABLED(dev_priv))
> + if (IS_LPE_AUDIO_IRQ_VALID(dev_priv))
> + 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.
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 8d44cee..fb734f2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2137,6 +2137,9 @@ 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_lpe_audio.c b/drivers/gpu/drm/i915/intel_lpe_audio.c
> new file mode 100644
> index 0000000..acfe22f
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> @@ -0,0 +1,357 @@
> +/*
> + * 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 at linux.intel.com>
> + * Jerome Anand <jerome.anand at intel.com>
> + * based on VED patches
> + *
> + */
> +
> +/**
> + * DOC: LPE Audio integration 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>
> +
> +static struct platform_device*
> +lpe_audio_platdev_create(struct drm_i915_private *dev_priv)
> +{
> + struct drm_device *dev = &dev_priv->drm;
> + int ret;
> + struct resource rsc[2] = {};
> + struct platform_device *platdev;
> + u64 *dma_mask;
> + struct intel_hdmi_lpe_audio_pdata *pdata;
> +
> + if (dev_priv->lpe_audio.irq < 0)
> + return ERR_PTR(-EINVAL);
> +
> + platdev = platform_device_alloc("hdmi-lpe-audio", -1);
> + if (!platdev) {
> + ret = -ENOMEM;
> + DRM_ERROR("Failed to allocate LPE audio platform device\n");
> + goto err;
> + }
> +
> + /* to work-around check_addr in nommu_map_sg() */
> + dma_mask = kmalloc(sizeof(*platdev->dev.dma_mask), GFP_KERNEL);
> + if (!dma_mask) {
> + ret = -ENOMEM;
> + DRM_ERROR("Failed to allocate dma_mask\n");
> + goto err_put_dev;
> + }
> + *dma_mask = DMA_BIT_MASK(32);
> + platdev->dev.dma_mask = dma_mask;
> + platdev->dev.coherent_dma_mask = *dma_mask;
> +
> + rsc[0].start = rsc[0].end = dev_priv->lpe_audio.irq;
> + rsc[0].flags = IORESOURCE_IRQ;
> + rsc[0].name = "hdmi-lpe-audio-irq";
> +
> + DRM_DEBUG("%s: HDMI_AUDIO rsc.start[0] = 0x%x\n",
> + __func__, (int)(rsc[0].start));
> +
> + 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";
> +
> + DRM_DEBUG("%s: HDMI_AUDIO rsc.start[1] = 0x%x\n",
> + __func__, (int)(rsc[1].start));
> +
> + ret = platform_device_add_resources(platdev, rsc, 2);
> + if (ret) {
> + DRM_ERROR("Failed to add resource for platform device: %d\n",
> + ret);
> + goto err_put_dev;
> + }
> +
> + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> +
> + if (pdata == NULL) {
> + ret = -ENOMEM;
> + goto err_put_dev;
> + }
> + platdev->dev.platform_data = pdata;
> +
> + /* for LPE audio driver's runtime-PM */
> + platdev->dev.parent = dev->dev;
> + ret = platform_device_add(platdev);
> + if (ret) {
> + DRM_ERROR("Failed to add LPE audio platform device: %d\n",
> + ret);
> + goto err_put_dev;
> + }
> + spin_lock_init(&pdata->lpe_audio_slock);
> +
> + return platdev;
> +err_put_dev:
> + platform_device_put(platdev);
> + kfree(dma_mask);
> +err:
> + return ERR_PTR(ret);
> +}
> +
> +static void lpe_audio_platdev_destroy(struct drm_i915_private *dev_priv)
> +{
> + if (dev_priv->lpe_audio.platdev) {
> + 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_device *dev = d->chip_data;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + unsigned long irqflags;
> + u32 val = (I915_LPE_PIPE_A_INTERRUPT |
> + I915_LPE_PIPE_B_INTERRUPT |
> + I915_LPE_PIPE_C_INTERRUPT);
> +
> + spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> +
> + /*
> + * VLV_IER is already set in the vlv_display_postinstall(),
> + * we only change VLV_IIR and VLV_IMR
> + */
> + 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_device *dev = d->chip_data;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + unsigned long irqflags;
> + u32 val = (I915_LPE_PIPE_A_INTERRUPT |
> + I915_LPE_PIPE_B_INTERRUPT |
> + I915_LPE_PIPE_C_INTERRUPT);
> +
> + spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> +
> + /*
> + * VLV_IER is already set in the vlv_display_postinstall(),
> + * we only change VLV_IIR and VLV_IMR
> + */
> + 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->drm);
> +}
> +
> +/**
> + * 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;
> +
> + 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_detect() - check & setup lpe audio if present
> + * @dev_priv: the i915 drm device private data
> + *
> + * Detect if lpe audio is present
> + *
> + * Return: true if lpe audio present else Return = false
> + */
> +int intel_lpe_audio_detect(struct drm_i915_private *dev_priv)
> +{
> + int lpe_present = false;
> + struct drm_device *dev = &dev_priv->drm;
> +
> + if (HAS_LPE_AUDIO(dev)) {
> + 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%s\n", "HDaudio controller not detected,",
> + "using LPE audio instead\n");
> + lpe_present = true;
> + }
> + }
> + return lpe_present;
> +}
> +
> +/**
> + * intel_lpe_audio_setup() - setup the bridge between HDMI LPE Audio
> + * driver and i915
> + * @dev_priv: the i915 drm device private data
> + *
> + * set up the minimum required resources for the bridge: irq chip,
> + * platform resource and platform device. i915 device is set as parent
> + * of the new platform device.
> + *
> + * Return: 0 if successful. non-zero if allocation/initialization fails
> + */
> +int intel_lpe_audio_setup(struct drm_i915_private *dev_priv)
> +{
> + int ret;
> +
> + dev_priv->lpe_audio.irq = irq_alloc_descs(-1, 0, 1, 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("%s : irq = %d\n", __func__, 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_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)
> +{
> + unsigned long irqflags;
> + struct irq_desc *desc;
> +
> + desc = IS_LPE_AUDIO_IRQ_VALID(dev_priv) ?
> + irq_to_desc(dev_priv->lpe_audio.irq) : NULL;
> +
> + /**
> + * mask LPE audio irq before destroying
> + */
> + if (desc)
> + lpe_audio_irq_mask(&desc->irq_data);
> +
> + spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
> +
> + lpe_audio_platdev_destroy(dev_priv);
> +
> + if (desc)
> + irq_free_desc(dev_priv->lpe_audio.irq);
> +
> + spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
> +}
> diff --git a/include/drm/intel_lpe_audio.h b/include/drm/intel_lpe_audio.h
> new file mode 100644
> index 0000000..a64c449
> --- /dev/null
> +++ b/include/drm/intel_lpe_audio.h
> @@ -0,0 +1,45 @@
> +/*
> + * 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>
> +
> +#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_ */
> --
> 2.9.3
> _______________________________________________
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> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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