v4.19.13 snapshot.
diff --git a/sound/hda/hdac_component.c b/sound/hda/hdac_component.c
new file mode 100644
index 0000000..6e46a9c
--- /dev/null
+++ b/sound/hda/hdac_component.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0
+// hdac_component.c - routines for sync between HD-A core and DRM driver
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/component.h>
+#include <sound/core.h>
+#include <sound/hdaudio.h>
+#include <sound/hda_component.h>
+#include <sound/hda_register.h>
+
+static void hdac_acomp_release(struct device *dev, void *res)
+{
+}
+
+static struct drm_audio_component *hdac_get_acomp(struct device *dev)
+{
+ return devres_find(dev, hdac_acomp_release, NULL, NULL);
+}
+
+/**
+ * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
+ * @bus: HDA core bus
+ * @enable: enable or disable the wakeup
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function should be called during the chip reset, also called at
+ * resume for updating STATESTS register read.
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
+{
+ struct drm_audio_component *acomp = bus->audio_component;
+
+ if (!acomp || !acomp->ops)
+ return -ENODEV;
+
+ if (!acomp->ops->codec_wake_override)
+ return 0;
+
+ dev_dbg(bus->dev, "%s codec wakeup\n",
+ enable ? "enable" : "disable");
+
+ acomp->ops->codec_wake_override(acomp->dev, enable);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
+
+/**
+ * snd_hdac_display_power - Power up / down the power refcount
+ * @bus: HDA core bus
+ * @enable: power up or down
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function manages a refcount and calls the get_power() and
+ * put_power() ops accordingly, toggling the codec wakeup, too.
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
+{
+ struct drm_audio_component *acomp = bus->audio_component;
+
+ if (!acomp || !acomp->ops)
+ return -ENODEV;
+
+ dev_dbg(bus->dev, "display power %s\n",
+ enable ? "enable" : "disable");
+
+ if (enable) {
+ if (!bus->drm_power_refcount++) {
+ if (acomp->ops->get_power)
+ acomp->ops->get_power(acomp->dev);
+ snd_hdac_set_codec_wakeup(bus, true);
+ snd_hdac_set_codec_wakeup(bus, false);
+ }
+ } else {
+ WARN_ON(!bus->drm_power_refcount);
+ if (!--bus->drm_power_refcount)
+ if (acomp->ops->put_power)
+ acomp->ops->put_power(acomp->dev);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_display_power);
+
+/**
+ * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
+ * @codec: HDA codec
+ * @nid: the pin widget NID
+ * @dev_id: device identifier
+ * @rate: the sample rate to set
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function sets N/CTS value based on the given sample rate.
+ * Returns zero for success, or a negative error code.
+ */
+int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
+ int dev_id, int rate)
+{
+ struct hdac_bus *bus = codec->bus;
+ struct drm_audio_component *acomp = bus->audio_component;
+ int port, pipe;
+
+ if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
+ return -ENODEV;
+ port = nid;
+ if (acomp->audio_ops && acomp->audio_ops->pin2port) {
+ port = acomp->audio_ops->pin2port(codec, nid);
+ if (port < 0)
+ return -EINVAL;
+ }
+ pipe = dev_id;
+ return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
+
+/**
+ * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
+ * @codec: HDA codec
+ * @nid: the pin widget NID
+ * @dev_id: device identifier
+ * @audio_enabled: the pointer to store the current audio state
+ * @buffer: the buffer pointer to store ELD bytes
+ * @max_bytes: the max bytes to be stored on @buffer
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function queries the current state of the audio on the given
+ * digital port and fetches the ELD bytes onto the given buffer.
+ * It returns the number of bytes for the total ELD data, zero for
+ * invalid ELD, or a negative error code.
+ *
+ * The return size is the total bytes required for the whole ELD bytes,
+ * thus it may be over @max_bytes. If it's over @max_bytes, it implies
+ * that only a part of ELD bytes have been fetched.
+ */
+int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
+ bool *audio_enabled, char *buffer, int max_bytes)
+{
+ struct hdac_bus *bus = codec->bus;
+ struct drm_audio_component *acomp = bus->audio_component;
+ int port, pipe;
+
+ if (!acomp || !acomp->ops || !acomp->ops->get_eld)
+ return -ENODEV;
+
+ port = nid;
+ if (acomp->audio_ops && acomp->audio_ops->pin2port) {
+ port = acomp->audio_ops->pin2port(codec, nid);
+ if (port < 0)
+ return -EINVAL;
+ }
+ pipe = dev_id;
+ return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
+ buffer, max_bytes);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
+
+static int hdac_component_master_bind(struct device *dev)
+{
+ struct drm_audio_component *acomp = hdac_get_acomp(dev);
+ int ret;
+
+ if (WARN_ON(!acomp))
+ return -EINVAL;
+
+ ret = component_bind_all(dev, acomp);
+ if (ret < 0)
+ return ret;
+
+ if (WARN_ON(!(acomp->dev && acomp->ops))) {
+ ret = -EINVAL;
+ goto out_unbind;
+ }
+
+ /* pin the module to avoid dynamic unbinding, but only if given */
+ if (!try_module_get(acomp->ops->owner)) {
+ ret = -ENODEV;
+ goto out_unbind;
+ }
+
+ if (acomp->audio_ops && acomp->audio_ops->master_bind) {
+ ret = acomp->audio_ops->master_bind(dev, acomp);
+ if (ret < 0)
+ goto module_put;
+ }
+
+ return 0;
+
+ module_put:
+ module_put(acomp->ops->owner);
+out_unbind:
+ component_unbind_all(dev, acomp);
+
+ return ret;
+}
+
+static void hdac_component_master_unbind(struct device *dev)
+{
+ struct drm_audio_component *acomp = hdac_get_acomp(dev);
+
+ if (acomp->audio_ops && acomp->audio_ops->master_unbind)
+ acomp->audio_ops->master_unbind(dev, acomp);
+ module_put(acomp->ops->owner);
+ component_unbind_all(dev, acomp);
+ WARN_ON(acomp->ops || acomp->dev);
+}
+
+static const struct component_master_ops hdac_component_master_ops = {
+ .bind = hdac_component_master_bind,
+ .unbind = hdac_component_master_unbind,
+};
+
+/**
+ * snd_hdac_acomp_register_notifier - Register audio component ops
+ * @bus: HDA core bus
+ * @aops: audio component ops
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function sets the given ops to be called by the graphics driver.
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *aops)
+{
+ if (!bus->audio_component)
+ return -ENODEV;
+
+ bus->audio_component->audio_ops = aops;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);
+
+/**
+ * snd_hdac_acomp_init - Initialize audio component
+ * @bus: HDA core bus
+ * @match_master: match function for finding components
+ * @extra_size: Extra bytes to allocate
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function initializes and sets up the audio component to communicate
+ * with graphics driver.
+ *
+ * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the
+ * binding with the DRM component. Each caller needs to sync via master_bind
+ * audio_ops.
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_acomp_init(struct hdac_bus *bus,
+ const struct drm_audio_component_audio_ops *aops,
+ int (*match_master)(struct device *, void *),
+ size_t extra_size)
+{
+ struct component_match *match = NULL;
+ struct device *dev = bus->dev;
+ struct drm_audio_component *acomp;
+ int ret;
+
+ if (WARN_ON(hdac_get_acomp(dev)))
+ return -EBUSY;
+
+ acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size,
+ GFP_KERNEL);
+ if (!acomp)
+ return -ENOMEM;
+ acomp->audio_ops = aops;
+ bus->audio_component = acomp;
+ devres_add(dev, acomp);
+
+ component_match_add(dev, &match, match_master, bus);
+ ret = component_master_add_with_match(dev, &hdac_component_master_ops,
+ match);
+ if (ret < 0)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ bus->audio_component = NULL;
+ devres_destroy(dev, hdac_acomp_release, NULL, NULL);
+ dev_info(dev, "failed to add audio component master (%d)\n", ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_acomp_init);
+
+/**
+ * snd_hdac_acomp_exit - Finalize audio component
+ * @bus: HDA core bus
+ *
+ * This function is supposed to be used only by a HD-audio controller
+ * driver that needs the interaction with graphics driver.
+ *
+ * This function releases the audio component that has been used.
+ *
+ * Returns zero for success or a negative error code.
+ */
+int snd_hdac_acomp_exit(struct hdac_bus *bus)
+{
+ struct device *dev = bus->dev;
+ struct drm_audio_component *acomp = bus->audio_component;
+
+ if (!acomp)
+ return 0;
+
+ WARN_ON(bus->drm_power_refcount);
+ if (bus->drm_power_refcount > 0 && acomp->ops)
+ acomp->ops->put_power(acomp->dev);
+
+ component_master_del(dev, &hdac_component_master_ops);
+
+ bus->audio_component = NULL;
+ devres_destroy(dev, hdac_acomp_release, NULL, NULL);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);