Re: [PATCH] drm/i915/dp: DP audio API changes for MST

["Yang, Libin" <libin.yang@intel.com>]

> -----Original Message-----
> From: Pandiyan, Dhinakaran
> Sent: Friday, August 5, 2016 1:57 PM
> To: Yang, Libin <libin.yang@intel.com>
> Cc: intel-gfx@lists.freedesktop.org; tiwai@suse.de; alsa-devel@alsa-
> project.org; libin.yang@linux.intel.com
> Subject: Re: [Intel-gfx] [PATCH] drm/i915/dp: DP audio API changes for MST
> 
> On Fri, 2016-08-05 at 02:35 +0000, Yang, Libin wrote:
> > > -----Original Message-----
> > > From: Intel-gfx [mailto:intel-gfx-bounces@lists.freedesktop.org] On
> > > Behalf Of Dhinakaran Pandiyan
> > > Sent: Wednesday, August 3, 2016 10:15 AM
> > > To: intel-gfx@lists.freedesktop.org
> > > Cc: alsa-devel@alsa-project.org; tiwai@suse.de;
> > > libin.yang@linux.intel.com; Pandiyan, Dhinakaran
> > > <dhinakaran.pandiyan@intel.com>
> > > Subject: [Intel-gfx] [PATCH] drm/i915/dp: DP audio API changes for
> > > MST
> > >
> > > 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,
> > > +	     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@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];
> >
> > We may still need save the port number info.
> > In non-MST mode, device entry means nothing. This means
> > av_enc_map[pipe] may not get the right intel_encoder
> >
> > Regards,
> > Libin
> >
> We find the encoder using port in get_saved_encoder()

It seems it still can't get the encoder for SST/HDMI as
pipe may always be -1 or 0 for SST/HDMI?

Regards,
Libin

> > >
> > >  	/*
> > >  	 * 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
> > >
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx