Re: [alsa-devel] [PATCH v2] drm/i915/dp: DP audio API changes for MST

On Tue, Aug 09, 2016 at 01:58:33PM -0700, Dhinakaran Pandiyan wrote:

DP MST provides the capability to send multiple video and audio streams through a single port. This requires the API's between i915 and audio drivers to distinguish between multiple audio capable displays that can be connected to a port. Currently only the port identity is shared in the APIs. This patch adds support for MST with an additional parameter 'int pipe'. The existing parameter 'port' does not change it's meaning.

pipe = MST : display 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 pipe,

•     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 pipe,
  

•        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 pipe);
  
  

This patch makes dummy changes in the audio drivers (Libin) for build to succeed. The audio side drivers will send the right 'pipe' values in patches that will follow.

v2: Renamed the new API parameter from 'dev_id' to 'pipe'. (Jim, Ville) Included Asoc driver API compatibility changes from Jeeja. Added WARN_ON() for invalid pipe in get_saved_encoder(). (Takashi) Added comment for av_enc_map[] definition. (Takashi)

Signed-off-by: Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com

drivers/gpu/drm/i915/i915_drv.h | 3 +- drivers/gpu/drm/i915/intel_audio.c | 92 ++++++++++++++++++++++++++------------ 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 +-- sound/soc/codecs/hdac_hdmi.c | 2 +- 7 files changed, 85 insertions(+), 45 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c36d176..8e4a88f 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2036,7 +2036,8 @@ struct drm_i915_private { /* perform PHY state sanity checks? */ bool chv_phy_assert[2];

• struct intel_encoder *dig_port_map[I915_MAX_PORTS];

• /* Used to save the pipe-to-encoder mapping for audio */

• 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 ef20875..240dad2 100644 --- a/drivers/gpu/drm/i915/intel_audio.c +++ b/drivers/gpu/drm/i915/intel_audio.c @@ -500,6 +500,7 @@ 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 = -1;

  connector = drm_select_eld(encoder); if (!connector)

@@ -524,12 +525,18 @@ void intel_audio_codec_enable(struct intel_encoder *intel_encoder)

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;

[-1] doesn't look right.

mutex_unlock(&dev_priv->av_mutex);

• if (intel_encoder->type == INTEL_OUTPUT_DP_MST)

• pipe = crtc->pipe;
  

• 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, (int) pipe);
  

}

/** @@ -542,22 +549,28 @@ 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 = -1;

  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;

same

mutex_unlock(&dev_priv->av_mutex);

• if (intel_encoder->type == INTEL_OUTPUT_DP_MST)

• pipe = crtc->pipe;
  

• 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, (int) pipe);
  

}

/** @@ -632,15 +645,39 @@ 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 pipe)
  

+{

• struct drm_encoder *encoder;
• if (WARN_ON(pipe >= I915_MAX_PIPES))

• return NULL;
  

• /* MST */
• if (pipe != -1)

• return av_enc_map[pipe];
  

• /* Non-MST */
• 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 pipe, int rate)
  

{ struct drm_i915_private *dev_priv = dev_to_i915(dev); struct intel_encoder *intel_encoder; struct intel_crtc *crtc; struct drm_display_mode *mode; struct i915_audio_component *acomp = dev_priv->audio_component;

• enum pipe pipe = INVALID_PIPE; u32 tmp; int n; int err = 0;

@@ -654,25 +691,20 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,

i915_audio_component_get_power(dev); 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, pipe); if (!intel_encoder || !intel_encoder->base.crtc || intel_encoder->type != INTEL_OUTPUT_HDMI) {

• DRM_DEBUG_KMS("no valid port %c\n", port_name(port));
  

• DRM_DEBUG_KMS("Not valid for port %c\n", port_name(port));
  

  err = -ENODEV; goto unlock; }
• /* pipe passed from the audio driver will be -1 for non-mst case */ crtc = to_intel_crtc(intel_encoder->base.crtc); pipe = crtc->pipe;

• if (pipe == INVALID_PIPE) {

• DRM_DEBUG_KMS("no pipe for the port %c\n", port_name(port));
  

• err = -ENODEV;
  

• goto unlock;
  

• }

• DRM_DEBUG_KMS("pipe %c connects port %c\n",

• 		  pipe_name(pipe), port_name(port));
  

  mode = &crtc->config->base.adjusted_mode;

  /* port must be valid now, otherwise the pipe will be invalid */

@@ -708,7 +740,7 @@ 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 pipe, bool *enabled,
  		unsigned char *buf, int max_bytes)
  

{ struct drm_i915_private *dev_priv = dev_to_i915(dev); @@ -717,16 +749,20 @@ static int i915_audio_component_get_eld(struct device *dev, int port, 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, pipe);

• if (!intel_encoder) {

• DRM_DEBUG_KMS("Not valid for port %c\n", port_name(port));
  

• 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..545c6e0 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 pipe, 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. */

Pleas update the docs to include what the pipe parameter means. Looks like most of these docs could use a little beefing up to make sure both sides follow the same contract. Right now there are a lot of grey areas.

• int (*get_eld)(struct device *, int port, bool *enabled,

• int (*get_eld)(struct device *, int port, int pipe, 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 pipe);

};

/** diff --git a/include/sound/hda_i915.h b/include/sound/hda_i915.h index 796cabf..07fd64e 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 pipe, int rate);
  

+int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int pipe, 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 pipe, 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 pipe, 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..b99994b 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 pipe, 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, pipe, 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 pipe, 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, pipe, 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..67890df 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 pipe) { struct hda_codec *codec = audio_ptr; int pin_nid; diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c index 2abb742..cf57ab3 100644 --- a/sound/soc/codecs/hdac_hdmi.c +++ b/sound/soc/codecs/hdac_hdmi.c @@ -1366,7 +1366,7 @@ static int hdac_hdmi_parse_and_map_nid(struct hdac_ext_device *edev, return hdac_hdmi_init_dai_map(edev); }

-static void hdac_hdmi_eld_notify_cb(void *aptr, int port) +static void hdac_hdmi_eld_notify_cb(void *aptr, int port, int pipe) { struct hdac_ext_device *edev = aptr; struct hdac_hdmi_priv *hdmi = edev->private_data; -- 2.5.0