ASoC: hdac_hdmi: use audio component framework to read ELD

With codec read sometimes the pin_sense shows invalid monitor present
and eld_valid. Currently driver polls for few times to get the valid
ELD data.

To avoid the latency, Instead of reading ELD from codec, read it
directly from the display driver using audio component framework.

Removed the direct codec helper functions.
Signed-off-by: Sandeep Tayal <sandeepx.tayal@intel.com>
Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/hdac_hdmi.c

@@ -46,6 +46,10 @@
 #define ELD_MAX_SIZE    256
 #define ELD_FIXED_BYTES	20
 
+#define ELD_VER_CEA_861D 2
+#define ELD_VER_PARTIAL 31
+#define ELD_MAX_MNL     16
+
 struct hdac_hdmi_cvt_params {
 	unsigned int channels_min;
 	unsigned int channels_max;
@@ -81,8 +85,6 @@ struct hdac_hdmi_pin {
 	hda_nid_t mux_nids[HDA_MAX_CONNECTIONS];
 	struct hdac_hdmi_eld eld;
 	struct hdac_ext_device *edev;
-	int repoll_count;
-	struct delayed_work work;
 	struct mutex lock;
 	bool chmap_set;
 	unsigned char chmap[8]; /* ALSA API channel-map */
@@ -173,80 +175,6 @@ static int hdac_hdmi_eld_limit_formats(struct snd_pcm_runtime *runtime,
 
 }
 
- /* HDMI ELD routines */
-static unsigned int hdac_hdmi_get_eld_data(struct hdac_device *codec,
-				hda_nid_t nid, int byte_index)
-{
-	unsigned int val;
-
-	val = snd_hdac_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_ELDD,
-							byte_index);
-
-	dev_dbg(&codec->dev, "HDMI: ELD data byte %d: 0x%x\n",
-					byte_index, val);
-
-	return val;
-}
-
-static int hdac_hdmi_get_eld_size(struct hdac_device *codec, hda_nid_t nid)
-{
-	return snd_hdac_codec_read(codec, nid, 0, AC_VERB_GET_HDMI_DIP_SIZE,
-						 AC_DIPSIZE_ELD_BUF);
-}
-
-/*
- * This function queries the ELD size and ELD data and fills in the buffer
- * passed by user
- */
-static int hdac_hdmi_get_eld(struct hdac_device *codec, hda_nid_t nid,
-			     unsigned char *buf, int *eld_size)
-{
-	int i, size, ret = 0;
-
-	/*
-	 * ELD size is initialized to zero in caller function. If no errors and
-	 * ELD is valid, actual eld_size is assigned.
-	 */
-
-	size = hdac_hdmi_get_eld_size(codec, nid);
-	if (size < ELD_FIXED_BYTES || size > ELD_MAX_SIZE) {
-		dev_err(&codec->dev, "HDMI: invalid ELD buf size %d\n", size);
-		return -ERANGE;
-	}
-
-	/* set ELD buffer */
-	for (i = 0; i < size; i++) {
-		unsigned int val = hdac_hdmi_get_eld_data(codec, nid, i);
-		/*
-		 * Graphics driver might be writing to ELD buffer right now.
-		 * Just abort. The caller will repoll after a while.
-		 */
-		if (!(val & AC_ELDD_ELD_VALID)) {
-			dev_err(&codec->dev,
-				"HDMI: invalid ELD data byte %d\n", i);
-			ret = -EINVAL;
-			goto error;
-		}
-		val &= AC_ELDD_ELD_DATA;
-		/*
-		 * The first byte cannot be zero. This can happen on some DVI
-		 * connections. Some Intel chips may also need some 250ms delay
-		 * to return non-zero ELD data, even when the graphics driver
-		 * correctly writes ELD content before setting ELD_valid bit.
-		 */
-		if (!val && !i) {
-			dev_err(&codec->dev, "HDMI: 0 ELD data\n");
-			ret = -EINVAL;
-			goto error;
-		}
-		buf[i] = val;
-	}
-
-	*eld_size = size;
-error:
-	return ret;
-}
-
 static int hdac_hdmi_setup_stream(struct hdac_ext_device *hdac,
 				hda_nid_t cvt_nid, hda_nid_t pin_nid,
 				u32 stream_tag, int format)
@@ -1059,32 +987,59 @@ static int hdac_hdmi_add_cvt(struct hdac_ext_device *edev, hda_nid_t nid)
 	return hdac_hdmi_query_cvt_params(&edev->hdac, cvt);
 }
 
-static void hdac_hdmi_parse_eld(struct hdac_ext_device *edev,
+static int  hdac_hdmi_parse_eld(struct hdac_ext_device *edev,
 			struct hdac_hdmi_pin *pin)
 {
+	unsigned int ver, mnl;
+
+	ver = (pin->eld.eld_buffer[DRM_ELD_VER] & DRM_ELD_VER_MASK)
+						>> DRM_ELD_VER_SHIFT;
+
+	if (ver != ELD_VER_CEA_861D && ver != ELD_VER_PARTIAL) {
+		dev_dbg(&edev->hdac.dev, "HDMI: Unknown ELD version %d\n", ver);
+		return -EINVAL;
+	}
+
+	mnl = (pin->eld.eld_buffer[DRM_ELD_CEA_EDID_VER_MNL] &
+		DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
+
+	if (mnl > ELD_MAX_MNL) {
+		dev_dbg(&edev->hdac.dev, "HDMI: MNL Invalid %d\n", mnl);
+		return -EINVAL;
+	}
+
 	pin->eld.info.spk_alloc = pin->eld.eld_buffer[DRM_ELD_SPEAKER];
+
+	return 0;
 }
 
-static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin, int repoll)
+static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin)
 {
 	struct hdac_ext_device *edev = pin->edev;
 	struct hdac_hdmi_priv *hdmi = edev->private_data;
 	struct hdac_hdmi_pcm *pcm;
-	int val;
-
-	pin->repoll_count = repoll;
+	int size;
 
-	pm_runtime_get_sync(&edev->hdac.dev);
-	val = snd_hdac_codec_read(&edev->hdac, pin->nid, 0,
-					AC_VERB_GET_PIN_SENSE, 0);
+	mutex_lock(&hdmi->pin_mutex);
+	pin->eld.monitor_present = false;
 
-	dev_dbg(&edev->hdac.dev, "Pin sense val %x for pin: %d\n",
-						val, pin->nid);
+	size = snd_hdac_acomp_get_eld(&edev->hdac, pin->nid, -1,
+				&pin->eld.monitor_present, pin->eld.eld_buffer,
+				ELD_MAX_SIZE);
 
+	if (size > 0) {
+		size = min(size, ELD_MAX_SIZE);
+		if (hdac_hdmi_parse_eld(edev, pin) < 0)
+			size = -EINVAL;
+	}
 
-	mutex_lock(&hdmi->pin_mutex);
-	pin->eld.monitor_present = !!(val & AC_PINSENSE_PRESENCE);
-	pin->eld.eld_valid = !!(val & AC_PINSENSE_ELDV);
+	if (size > 0) {
+		pin->eld.eld_valid = true;
+		pin->eld.eld_size = size;
+	} else {
+		pin->eld.eld_valid = false;
+		pin->eld.eld_size = 0;
+	}
 
 	pcm = hdac_hdmi_get_pcm(edev, pin);
 
@@ -1106,66 +1061,23 @@ static void hdac_hdmi_present_sense(struct hdac_hdmi_pin *pin, int repoll)
 		}
 
 		mutex_unlock(&hdmi->pin_mutex);
-		goto put_hdac_device;
+		return;
 	}
 
 	if (pin->eld.monitor_present && pin->eld.eld_valid) {
-		/* TODO: use i915 component for reading ELD later */
-		if (hdac_hdmi_get_eld(&edev->hdac, pin->nid,
-				pin->eld.eld_buffer,
-				&pin->eld.eld_size) == 0) {
-
-			if (pcm) {
-				dev_dbg(&edev->hdac.dev,
-					"jack report for pcm=%d\n",
-					pcm->pcm_id);
-
-				snd_jack_report(pcm->jack, SND_JACK_AVOUT);
-			}
-			hdac_hdmi_parse_eld(edev, pin);
-
-			print_hex_dump_debug("ELD: ",
-					DUMP_PREFIX_OFFSET, 16, 1,
-					pin->eld.eld_buffer, pin->eld.eld_size,
-					true);
-		} else {
-			pin->eld.monitor_present = false;
-			pin->eld.eld_valid = false;
-
-			if (pcm) {
-				dev_dbg(&edev->hdac.dev,
-					"jack report for pcm=%d\n",
-					pcm->pcm_id);
+		if (pcm) {
+			dev_dbg(&edev->hdac.dev,
+				"jack report for pcm=%d\n",
+				pcm->pcm_id);
 
-				snd_jack_report(pcm->jack, 0);
-			}
+			snd_jack_report(pcm->jack, SND_JACK_AVOUT);
 		}
+
+		print_hex_dump_debug("ELD: ", DUMP_PREFIX_OFFSET, 16, 1,
+			  pin->eld.eld_buffer, pin->eld.eld_size, false);
 	}
 
 	mutex_unlock(&hdmi->pin_mutex);
-
-	/*
-	 * Sometimes the pin_sense may present invalid monitor
-	 * present and eld_valid. If ELD data is not valid, loop few
-	 * more times to get correct pin sense and valid ELD.
-	 */
-	if ((!pin->eld.monitor_present || !pin->eld.eld_valid) && repoll)
-		schedule_delayed_work(&pin->work, msecs_to_jiffies(300));
-
-put_hdac_device:
-	pm_runtime_put_sync(&edev->hdac.dev);
-}
-
-static void hdac_hdmi_repoll_eld(struct work_struct *work)
-{
-	struct hdac_hdmi_pin *pin =
-		container_of(to_delayed_work(work), struct hdac_hdmi_pin, work);
-
-	/* picked from legacy HDA driver */
-	if (pin->repoll_count++ > 6)
-		pin->repoll_count = 0;
-
-	hdac_hdmi_present_sense(pin, pin->repoll_count);
 }
 
 static int hdac_hdmi_add_pin(struct hdac_ext_device *edev, hda_nid_t nid)
@@ -1184,7 +1096,6 @@ static int hdac_hdmi_add_pin(struct hdac_ext_device *edev, hda_nid_t nid)
 
 	pin->edev = edev;
 	mutex_init(&pin->lock);
-	INIT_DELAYED_WORK(&pin->work, hdac_hdmi_repoll_eld);
 
 	return 0;
 }
@@ -1395,7 +1306,7 @@ static void hdac_hdmi_eld_notify_cb(void *aptr, int port)
 
 	list_for_each_entry(pin, &hdmi->pin_list, head) {
 		if (pin->nid == pin_nid)
-			hdac_hdmi_present_sense(pin, 1);
+			hdac_hdmi_present_sense(pin);
 	}
 }
 
@@ -1496,7 +1407,7 @@ static int hdmi_codec_probe(struct snd_soc_codec *codec)
 	}
 
 	list_for_each_entry(pin, &hdmi->pin_list, head)
-		hdac_hdmi_present_sense(pin, 1);
+		hdac_hdmi_present_sense(pin);
 
 	/* Imp: Store the card pointer in hda_codec */
 	edev->card = dapm->card->snd_card;
@@ -1561,7 +1472,7 @@ static void hdmi_codec_complete(struct device *dev)
 	 * all pins here.
 	 */
 	list_for_each_entry(pin, &hdmi->pin_list, head)
-		hdac_hdmi_present_sense(pin, 1);
+		hdac_hdmi_present_sense(pin);
 
 	pm_runtime_put_sync(&edev->hdac.dev);
 }