diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig index febe1c2b7d9aa6..9f6c99c1d87b4a 100644 --- a/sound/pci/hda/Kconfig +++ b/sound/pci/hda/Kconfig @@ -285,15 +285,16 @@ config SND_HDA_INTEL_HDMI_SILENT_STREAM bool "Enable Silent Stream always for HDMI" depends on SND_HDA_INTEL help - Intel hardware has a feature called 'silent stream', that - keeps external HDMI receiver's analog circuitry powered on - avoiding 2-3 sec silence during playback start. This mechanism - relies on setting channel_id as 0xf, sending info packet and - preventing codec D3 entry (increasing platform static power - consumption when HDMI receiver is plugged-in). 2-3 sec silence - at the playback start is expected whenever there is format change. - (default is 2 channel format). - Say Y to enable Silent Stream feature. + Say Y to enable HD-Audio Keep Alive (KAE) aka Silent Stream + for HDMI on hardware that supports the feature. + + When enabled, the HDMI/DisplayPort codec will continue to provide + a continuous clock and a valid but silent data stream to + any connected external receiver. This allows to avoid gaps + at start of playback. Many receivers require multiple seconds + to start playing audio after the clock has been stopped. + This feature can impact power consumption as resources + are kept reserved both at transmitter and receiver. endif diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 64fe025fda86b9..69a912c52ca7fc 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -120,6 +120,12 @@ struct hdmi_pcm { struct snd_kcontrol *eld_ctl; }; +enum { + SILENT_STREAM_OFF = 0, + SILENT_STREAM_KAE, /* use standard HDA Keep-Alive */ + SILENT_STREAM_I915, /* Intel i915 extension */ +}; + struct hdmi_spec { struct hda_codec *codec; int num_cvts; @@ -179,7 +185,7 @@ struct hdmi_spec { hda_nid_t vendor_nid; const int *port_map; int port_num; - bool send_silent_stream; /* Flag to enable silent stream feature */ + int silent_stream_type; }; #ifdef CONFIG_SND_HDA_COMPONENT @@ -1665,18 +1671,71 @@ static void hdmi_present_sense_via_verbs(struct hdmi_spec_per_pin *per_pin, #define I915_SILENT_FORMAT_BITS 16 #define I915_SILENT_FMT_MASK 0xf +static void silent_stream_enable_i915(struct hda_codec *codec, + struct hdmi_spec_per_pin *per_pin) +{ + unsigned int format; + + snd_hdac_sync_audio_rate(&codec->core, per_pin->pin_nid, + per_pin->dev_id, I915_SILENT_RATE); + + /* trigger silent stream generation in hw */ + format = snd_hdac_calc_stream_format(I915_SILENT_RATE, I915_SILENT_CHANNELS, + I915_SILENT_FORMAT, I915_SILENT_FORMAT_BITS, 0); + snd_hda_codec_setup_stream(codec, per_pin->cvt_nid, + I915_SILENT_FMT_MASK, I915_SILENT_FMT_MASK, format); + usleep_range(100, 200); + snd_hda_codec_setup_stream(codec, per_pin->cvt_nid, I915_SILENT_FMT_MASK, 0, format); + + per_pin->channels = I915_SILENT_CHANNELS; + hdmi_setup_audio_infoframe(codec, per_pin, per_pin->non_pcm); +} + +static void silent_stream_set_kae(struct hda_codec *codec, + struct hdmi_spec_per_pin *per_pin, + bool enable) +{ + unsigned int param; + + codec_dbg(codec, "HDMI: KAE %d cvt-NID=0x%x\n", enable, per_pin->cvt_nid); + + param = snd_hda_codec_read(codec, per_pin->cvt_nid, 0, AC_VERB_GET_DIGI_CONVERT_1, 0); + param = (param >> 16) & 0xff; + + if (enable) + param |= AC_DIG3_KAE; + else + param &= ~AC_DIG3_KAE; + + snd_hda_codec_write(codec, per_pin->cvt_nid, 0, AC_VERB_SET_DIGI_CONVERT_3, param); +} + static void silent_stream_enable(struct hda_codec *codec, struct hdmi_spec_per_pin *per_pin) { struct hdmi_spec *spec = codec->spec; struct hdmi_spec_per_cvt *per_cvt; int cvt_idx, pin_idx, err; - unsigned int format; + int keep_power = 0; + + /* + * Power-up will call hdmi_present_sense, so the PM calls + * have to be done without mutex held. + */ + + err = snd_hda_power_up_pm(codec); + if (err < 0 && err != -EACCES) { + codec_err(codec, + "Failed to power up codec for silent stream enable ret=[%d]\n", err); + snd_hda_power_down_pm(codec); + return; + } mutex_lock(&per_pin->lock); if (per_pin->setup) { codec_dbg(codec, "hdmi: PCM already open, no silent stream\n"); + err = -EBUSY; goto unlock_out; } @@ -1703,22 +1762,23 @@ static void silent_stream_enable(struct hda_codec *codec, /* configure unused pins to choose other converters */ pin_cvt_fixup(codec, per_pin, 0); - snd_hdac_sync_audio_rate(&codec->core, per_pin->pin_nid, - per_pin->dev_id, I915_SILENT_RATE); - - /* trigger silent stream generation in hw */ - format = snd_hdac_calc_stream_format(I915_SILENT_RATE, I915_SILENT_CHANNELS, - I915_SILENT_FORMAT, I915_SILENT_FORMAT_BITS, 0); - snd_hda_codec_setup_stream(codec, per_pin->cvt_nid, - I915_SILENT_FMT_MASK, I915_SILENT_FMT_MASK, format); - usleep_range(100, 200); - snd_hda_codec_setup_stream(codec, per_pin->cvt_nid, I915_SILENT_FMT_MASK, 0, format); - - per_pin->channels = I915_SILENT_CHANNELS; - hdmi_setup_audio_infoframe(codec, per_pin, per_pin->non_pcm); + switch (spec->silent_stream_type) { + case SILENT_STREAM_KAE: + silent_stream_set_kae(codec, per_pin, true); + break; + case SILENT_STREAM_I915: + silent_stream_enable_i915(codec, per_pin); + keep_power = 1; + break; + default: + break; + } unlock_out: mutex_unlock(&per_pin->lock); + + if (err || !keep_power) + snd_hda_power_down_pm(codec); } static void silent_stream_disable(struct hda_codec *codec, @@ -1726,7 +1786,16 @@ static void silent_stream_disable(struct hda_codec *codec, { struct hdmi_spec *spec = codec->spec; struct hdmi_spec_per_cvt *per_cvt; - int cvt_idx; + int cvt_idx, err; + + err = snd_hda_power_up_pm(codec); + if (err < 0 && err != -EACCES) { + codec_err(codec, + "Failed to power up codec for silent stream disable ret=[%d]\n", + err); + snd_hda_power_down_pm(codec); + return; + } mutex_lock(&per_pin->lock); if (!per_pin->silent_stream) @@ -1741,11 +1810,20 @@ static void silent_stream_disable(struct hda_codec *codec, per_cvt->assigned = 0; } + if (spec->silent_stream_type == SILENT_STREAM_I915) { + /* release ref taken in silent_stream_enable() */ + snd_hda_power_down_pm(codec); + } else if (spec->silent_stream_type == SILENT_STREAM_KAE) { + silent_stream_set_kae(codec, per_pin, false); + } + per_pin->cvt_nid = 0; per_pin->silent_stream = false; unlock_out: mutex_unlock(&per_pin->lock); + + snd_hda_power_down_pm(codec); } /* update ELD and jack state via audio component */ @@ -1767,29 +1845,11 @@ static void sync_eld_via_acomp(struct hda_codec *codec, monitor_next = per_pin->sink_eld.monitor_present; mutex_unlock(&per_pin->lock); - /* - * Power-up will call hdmi_present_sense, so the PM calls - * have to be done without mutex held. - */ - - if (spec->send_silent_stream) { - int pm_ret; - - if (!monitor_prev && monitor_next) { - pm_ret = snd_hda_power_up_pm(codec); - if (pm_ret < 0) - codec_err(codec, - "Monitor plugged-in, Failed to power up codec ret=[%d]\n", - pm_ret); + if (spec->silent_stream_type) { + if (!monitor_prev && monitor_next) silent_stream_enable(codec, per_pin); - } else if (monitor_prev && !monitor_next) { + else if (monitor_prev && !monitor_next) silent_stream_disable(codec, per_pin); - pm_ret = snd_hda_power_down_pm(codec); - if (pm_ret < 0) - codec_err(codec, - "Monitor plugged-out, Failed to power down codec ret=[%d]\n", - pm_ret); - } } } @@ -2982,7 +3042,7 @@ static int intel_hsw_common_init(struct hda_codec *codec, hda_nid_t vendor_nid, * module param or Kconfig option */ if (send_silent_stream) - spec->send_silent_stream = true; + spec->silent_stream_type = SILENT_STREAM_I915; return parse_intel_hdmi(codec); } @@ -3035,6 +3095,22 @@ static int patch_i915_tgl_hdmi(struct hda_codec *codec) return ret; } +static int patch_i915_adlp_hdmi(struct hda_codec *codec) +{ + struct hdmi_spec *spec; + int res; + + res = patch_i915_tgl_hdmi(codec); + if (!res) { + spec = codec->spec; + + if (spec->silent_stream_type) + spec->silent_stream_type = SILENT_STREAM_KAE; + } + + return res; +} + /* Intel Baytrail and Braswell; with eld notifier */ static int patch_i915_byt_hdmi(struct hda_codec *codec) { @@ -4391,10 +4467,10 @@ HDA_CODEC_ENTRY(0x80862814, "DG1 HDMI", patch_i915_tgl_hdmi), HDA_CODEC_ENTRY(0x80862815, "Alderlake HDMI", patch_i915_tgl_hdmi), HDA_CODEC_ENTRY(0x80862816, "Rocketlake HDMI", patch_i915_tgl_hdmi), HDA_CODEC_ENTRY(0x80862818, "Raptorlake HDMI", patch_i915_tgl_hdmi), -HDA_CODEC_ENTRY(0x80862819, "DG2 HDMI", patch_i915_tgl_hdmi), +HDA_CODEC_ENTRY(0x80862819, "DG2 HDMI", patch_i915_adlp_hdmi), HDA_CODEC_ENTRY(0x8086281a, "Jasperlake HDMI", patch_i915_icl_hdmi), HDA_CODEC_ENTRY(0x8086281b, "Elkhartlake HDMI", patch_i915_icl_hdmi), -HDA_CODEC_ENTRY(0x8086281c, "Alderlake-P HDMI", patch_i915_tgl_hdmi), +HDA_CODEC_ENTRY(0x8086281c, "Alderlake-P HDMI", patch_i915_adlp_hdmi), HDA_CODEC_ENTRY(0x80862880, "CedarTrail HDMI", patch_generic_hdmi), HDA_CODEC_ENTRY(0x80862882, "Valleyview2 HDMI", patch_i915_byt_hdmi), HDA_CODEC_ENTRY(0x80862883, "Braswell HDMI", patch_i915_byt_hdmi),