[alsa-devel] [Intel-gfx] [PATCH] drm/i915/dp: DP audio API changes for MST
Pandiyan, Dhinakaran
dhinakaran.pandiyan at intel.com
Wed Aug 3 21:43:06 CEST 2016
On Wed, 2016-08-03 at 22:08 +0300, Ville Syrjälä wrote:
> On Tue, Aug 02, 2016 at 07:14:30PM -0700, Dhinakaran Pandiyan wrote:
> > DP MST provides the capability to send multiple video and audio streams via
> > one single port. This requires the API's between i915 and audio drivers to
> > distinguish between audio capable displays connected to a port. This patch
> > adds this support via an additional parameter 'int dev_id'. The existing
> > parameter 'port' does not change it's meaning.
> >
> > dev_id =
> > MST : pipe that the stream originates from
> > Non-MST : -1
> >
> > Affected APIs:
> > struct i915_audio_component_ops
> > - int (*sync_audio_rate)(struct device *, int port, int rate);
> > + int (*sync_audio_rate)(struct device *, int port, int dev_id,
>
> Does the term 'dev_id' have some special meaning on the audio side? On
> the i915 side things would be less confusing if we just called it
> 'pipe'.
>
There was quite a bit of back and forth on this. "pipe" seemed to tie us
to the gfx hardware architecture. In case, there is no 1:1 mapping from
pipes to encoders, this will get confusing as i915 audio registers
(E.g.HSW_AUD_PIN_ELD_CP_VLD) are encoder based. Whereas, dev_id is
generic - HDA spec calls them "devices" or "device entry"
> > + int rate);
> >
> > - int (*get_eld)(struct device *, int port, bool *enabled,
> > - unsigned char *buf, int max_bytes);
> > + int (*get_eld)(struct device *, int port, int dev_id,
> > + bool *enabled, unsigned char *buf, int max_bytes);
> >
> > struct i915_audio_component_audio_ops
> > - void (*pin_eld_notify)(void *audio_ptr, int port);
> > + void (*pin_eld_notify)(void *audio_ptr, int port, int dev_id);
> >
> > This patch makes dummy changes in the audio drivers for build to succeed.
> >
> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> > ---
> > drivers/gpu/drm/i915/i915_drv.h | 2 +-
> > drivers/gpu/drm/i915/intel_audio.c | 82 +++++++++++++++++++++++++++++---------
> > include/drm/i915_component.h | 6 +--
> > include/sound/hda_i915.h | 11 ++---
> > sound/hda/hdac_i915.c | 9 +++--
> > sound/pci/hda/patch_hdmi.c | 7 ++--
> > 6 files changed, 82 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 65ada5d..8e4c8c8 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -2054,7 +2054,7 @@ struct drm_i915_private {
> > /* perform PHY state sanity checks? */
> > bool chv_phy_assert[2];
> >
> > - struct intel_encoder *dig_port_map[I915_MAX_PORTS];
> > + struct intel_encoder *av_enc_map[I915_MAX_PIPES];
> >
> > /*
> > * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> > index 8c493de..cbe44c8 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -500,6 +500,9 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
> > struct i915_audio_component *acomp = dev_priv->audio_component;
> > struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
> > enum port port = intel_dig_port->port;
> > + enum pipe pipe = crtc->pipe;
> > + int dev_id = -1;
> > +
> >
> > connector = drm_select_eld(encoder);
> > if (!connector)
> > @@ -522,14 +525,19 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
> > dev_priv->display.audio_codec_enable(connector, intel_encoder,
> > adjusted_mode);
> >
> > + if (intel_encoder->type == INTEL_OUTPUT_DP_MST)
> > + dev_id = pipe;
> > +
> > mutex_lock(&dev_priv->av_mutex);
> > intel_encoder->audio_connector = connector;
> > +
> > /* referred in audio callbacks */
> > - dev_priv->dig_port_map[port] = intel_encoder;
> > + dev_priv->av_enc_map[pipe] = intel_encoder;
> > mutex_unlock(&dev_priv->av_mutex);
> >
> > if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> > - acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr, (int) port);
> > + acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
> > + (int) port, dev_id);
> > }
> >
> > /**
> > @@ -542,22 +550,29 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)
> > void intel_audio_codec_disable(struct intel_encoder *intel_encoder)
> > {
> > struct drm_encoder *encoder = &intel_encoder->base;
> > + struct intel_crtc *crtc = to_intel_crtc(encoder->crtc);
> > struct drm_device *dev = encoder->dev;
> > struct drm_i915_private *dev_priv = to_i915(dev);
> > struct i915_audio_component *acomp = dev_priv->audio_component;
> > struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
> > enum port port = intel_dig_port->port;
> > + enum pipe pipe = crtc->pipe;
> > + int dev_id = -1;
> > +
> > + if (intel_encoder->type == INTEL_OUTPUT_DP_MST)
> > + dev_id = pipe;
> >
> > if (dev_priv->display.audio_codec_disable)
> > dev_priv->display.audio_codec_disable(intel_encoder);
> >
> > mutex_lock(&dev_priv->av_mutex);
> > intel_encoder->audio_connector = NULL;
> > - dev_priv->dig_port_map[port] = NULL;
> > + dev_priv->av_enc_map[pipe] = NULL;
> > mutex_unlock(&dev_priv->av_mutex);
> >
> > if (acomp && acomp->audio_ops && acomp->audio_ops->pin_eld_notify)
> > - acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr, (int) port);
> > + acomp->audio_ops->pin_eld_notify(acomp->audio_ops->audio_ptr,
> > + (int) port, dev_id);
> > }
> >
> > /**
> > @@ -628,8 +643,32 @@ static int i915_audio_component_get_cdclk_freq(struct device *dev)
> > return dev_priv->cdclk_freq;
> > }
> >
> > -static int i915_audio_component_sync_audio_rate(struct device *dev,
> > - int port, int rate)
> > +static struct intel_encoder *get_saved_encoder(struct intel_encoder *av_enc_map[],
> > + int port, int dev_id)
> > +{
> > +
> > + enum pipe pipe;
> > + struct drm_encoder *encoder;
> > +
> > + if (dev_id >= 0 && dev_id < I915_MAX_PIPES)
> > + return av_enc_map[dev_id];
> > +
> > + for (pipe = PIPE_A; pipe < I915_MAX_PIPES; pipe++) {
> > +
> > + if (!av_enc_map[pipe])
> > + continue;
> > +
> > + encoder = &av_enc_map[pipe]->base;
> > + if (port == enc_to_dig_port(encoder)->port)
> > + return av_enc_map[pipe];
> > + }
> > +
> > + return NULL;
> > +
> > +}
> > +
> > +static int i915_audio_component_sync_audio_rate(struct device *dev, int port,
> > + int dev_id, int rate)
> > {
> > struct drm_i915_private *dev_priv = dev_to_i915(dev);
> > struct intel_encoder *intel_encoder;
> > @@ -649,15 +688,16 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> > return 0;
> >
> > mutex_lock(&dev_priv->av_mutex);
> > +
> > /* 1. get the pipe */
> > - intel_encoder = dev_priv->dig_port_map[port];
> > - /* intel_encoder might be NULL for DP MST */
> > + intel_encoder = get_saved_encoder(dev_priv->av_enc_map, port, dev_id);
> > if (!intel_encoder || !intel_encoder->base.crtc ||
> > intel_encoder->type != INTEL_OUTPUT_HDMI) {
> > DRM_DEBUG_KMS("no valid port %c\n", port_name(port));
> > err = -ENODEV;
> > goto unlock;
> > }
> > +
> > crtc = to_intel_crtc(intel_encoder->base.crtc);
> > pipe = crtc->pipe;
> > if (pipe == INVALID_PIPE) {
> > @@ -702,7 +742,7 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> > }
> >
> > static int i915_audio_component_get_eld(struct device *dev, int port,
> > - bool *enabled,
> > + int dev_id, bool *enabled,
> > unsigned char *buf, int max_bytes)
> > {
> > struct drm_i915_private *dev_priv = dev_to_i915(dev);
> > @@ -710,17 +750,21 @@ static int i915_audio_component_get_eld(struct device *dev, int port,
> > const u8 *eld;
> > int ret = -EINVAL;
> >
> > +
> > mutex_lock(&dev_priv->av_mutex);
> > - intel_encoder = dev_priv->dig_port_map[port];
> > - /* intel_encoder might be NULL for DP MST */
> > - if (intel_encoder) {
> > - ret = 0;
> > - *enabled = intel_encoder->audio_connector != NULL;
> > - if (*enabled) {
> > - eld = intel_encoder->audio_connector->eld;
> > - ret = drm_eld_size(eld);
> > - memcpy(buf, eld, min(max_bytes, ret));
> > - }
> > +
> > + intel_encoder = get_saved_encoder(dev_priv->av_enc_map, port, dev_id);
> > + if (!intel_encoder) {
> > + mutex_unlock(&dev_priv->av_mutex);
> > + return ret;
> > + }
> > +
> > + ret = 0;
> > + *enabled = intel_encoder->audio_connector != NULL;
> > + if (*enabled) {
> > + eld = intel_encoder->audio_connector->eld;
> > + ret = drm_eld_size(eld);
> > + memcpy(buf, eld, min(max_bytes, ret));
> > }
> >
> > mutex_unlock(&dev_priv->av_mutex);
> > diff --git a/include/drm/i915_component.h b/include/drm/i915_component.h
> > index b46fa0e..1419c98 100644
> > --- a/include/drm/i915_component.h
> > +++ b/include/drm/i915_component.h
> > @@ -64,7 +64,7 @@ struct i915_audio_component_ops {
> > * Called from audio driver. After audio driver sets the
> > * sample rate, it will call this function to set n/cts
> > */
> > - int (*sync_audio_rate)(struct device *, int port, int rate);
> > + int (*sync_audio_rate)(struct device *, int port, int dev_id, int rate);
> > /**
> > * @get_eld: fill the audio state and ELD bytes for the given port
> > *
> > @@ -77,7 +77,7 @@ struct i915_audio_component_ops {
> > * Note that the returned size may be over @max_bytes. Then it
> > * implies that only a part of ELD has been copied to the buffer.
> > */
> > - int (*get_eld)(struct device *, int port, bool *enabled,
> > + int (*get_eld)(struct device *, int port, int dev_id, bool *enabled,
> > unsigned char *buf, int max_bytes);
> > };
> >
> > @@ -97,7 +97,7 @@ struct i915_audio_component_audio_ops {
> > * status accordingly (even when the HDA controller is in power save
> > * mode).
> > */
> > - void (*pin_eld_notify)(void *audio_ptr, int port);
> > + void (*pin_eld_notify)(void *audio_ptr, int port, int dev_id);
> > };
> >
> > /**
> > diff --git a/include/sound/hda_i915.h b/include/sound/hda_i915.h
> > index 796cabf..5ab972e 100644
> > --- a/include/sound/hda_i915.h
> > +++ b/include/sound/hda_i915.h
> > @@ -10,8 +10,9 @@
> > int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable);
> > int snd_hdac_display_power(struct hdac_bus *bus, bool enable);
> > void snd_hdac_i915_set_bclk(struct hdac_bus *bus);
> > -int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, int rate);
> > -int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid,
> > +int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
> > + int dev_id, int rate);
> > +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);
> > int snd_hdac_i915_init(struct hdac_bus *bus);
> > int snd_hdac_i915_exit(struct hdac_bus *bus);
> > @@ -29,13 +30,13 @@ static inline void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
> > {
> > }
> > static inline int snd_hdac_sync_audio_rate(struct hdac_device *codec,
> > - hda_nid_t nid, int rate)
> > + hda_nid_t nid, int dev_id, int rate)
> > {
> > return 0;
> > }
> > static inline int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid,
> > - bool *audio_enabled, char *buffer,
> > - int max_bytes)
> > + int dev_id, bool *audio_enabled,
> > + char *buffer, int max_bytes)
> > {
> > return -ENODEV;
> > }
> > diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
> > index c9af022..6ea63ac 100644
> > --- a/sound/hda/hdac_i915.c
> > +++ b/sound/hda/hdac_i915.c
> > @@ -201,7 +201,8 @@ static int pin2port(struct hdac_device *codec, hda_nid_t pin_nid)
> > * 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 rate)
> > +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 i915_audio_component *acomp = bus->audio_component;
> > @@ -212,7 +213,7 @@ int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, int rate)
> > port = pin2port(codec, nid);
> > if (port < 0)
> > return -EINVAL;
> > - return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
> > + return acomp->ops->sync_audio_rate(acomp->dev, port, dev_id, rate);
> > }
> > EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
> >
> > @@ -236,7 +237,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
> > * 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 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;
> > @@ -249,7 +250,7 @@ int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid,
> > port = pin2port(codec, nid);
> > if (port < 0)
> > return -EINVAL;
> > - return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
> > + return acomp->ops->get_eld(acomp->dev, port, dev_id, audio_enabled,
> > buffer, max_bytes);
> > }
> > EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
> > diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> > index d0d5ad8..077d48a 100644
> > --- a/sound/pci/hda/patch_hdmi.c
> > +++ b/sound/pci/hda/patch_hdmi.c
> > @@ -1485,7 +1485,7 @@ static void sync_eld_via_acomp(struct hda_codec *codec,
> >
> > mutex_lock(&per_pin->lock);
> > eld->monitor_present = false;
> > - size = snd_hdac_acomp_get_eld(&codec->core, per_pin->pin_nid,
> > + size = snd_hdac_acomp_get_eld(&codec->core, per_pin->pin_nid, -1,
> > &eld->monitor_present, eld->eld_buffer,
> > ELD_MAX_SIZE);
> > if (size > 0) {
> > @@ -1739,7 +1739,8 @@ static int generic_hdmi_playback_pcm_prepare(struct hda_pcm_stream *hinfo,
> > /* Call sync_audio_rate to set the N/CTS/M manually if necessary */
> > /* Todo: add DP1.2 MST audio support later */
> > if (codec_has_acomp(codec))
> > - snd_hdac_sync_audio_rate(&codec->core, pin_nid, runtime->rate);
> > + snd_hdac_sync_audio_rate(&codec->core, pin_nid, -1,
> > + runtime->rate);
> >
> > non_pcm = check_non_pcm_per_cvt(codec, cvt_nid);
> > mutex_lock(&per_pin->lock);
> > @@ -2285,7 +2286,7 @@ static void haswell_set_power_state(struct hda_codec *codec, hda_nid_t fg,
> > snd_hda_codec_set_power_to_all(codec, fg, power_state);
> > }
> >
> > -static void intel_pin_eld_notify(void *audio_ptr, int port)
> > +static void intel_pin_eld_notify(void *audio_ptr, int port, int dev_id)
> > {
> > struct hda_codec *codec = audio_ptr;
> > int pin_nid;
> > --
> > 2.5.0
>
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