[alsa-devel] Applied "ASoC: mediatek: btcvsd add loopback" to the asoc tree

[Mark Brown]

The patch

   ASoC: mediatek: btcvsd add loopback

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From f060f46f09bb920d1e0d436d654996033b856e26 Mon Sep 17 00:00:00 2001
From: KaiChieh Chuang <kaichieh.chuang at mediatek.com>
Date: Wed, 27 Feb 2019 09:30:44 +0800
Subject: [PATCH] ASoC: mediatek: btcvsd add loopback

add direct loopback path from rx to tx

Signed-off-by: KaiChieh Chuang <kaichieh.chuang at mediatek.com>
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/mediatek/common/mtk-btcvsd.c | 69 +++++++++++++++++++++++++-
 1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/sound/soc/mediatek/common/mtk-btcvsd.c b/sound/soc/mediatek/common/mtk-btcvsd.c
index 1b8bcdaf02d1..9a163d7064d1 100644
--- a/sound/soc/mediatek/common/mtk-btcvsd.c
+++ b/sound/soc/mediatek/common/mtk-btcvsd.c
@@ -49,6 +49,7 @@ enum bt_sco_state {
 	BT_SCO_STATE_IDLE,
 	BT_SCO_STATE_RUNNING,
 	BT_SCO_STATE_ENDING,
+	BT_SCO_STATE_LOOPBACK,
 };
 
 enum bt_sco_direct {
@@ -486,7 +487,8 @@ static irqreturn_t mtk_btcvsd_snd_irq_handler(int irq_id, void *dev)
 	if (bt->rx->state != BT_SCO_STATE_RUNNING &&
 	    bt->rx->state != BT_SCO_STATE_ENDING &&
 	    bt->tx->state != BT_SCO_STATE_RUNNING &&
-	    bt->tx->state != BT_SCO_STATE_ENDING) {
+	    bt->tx->state != BT_SCO_STATE_ENDING &&
+	    bt->tx->state != BT_SCO_STATE_LOOPBACK) {
 		dev_warn(bt->dev, "%s(), in idle state: rx->state: %d, tx->state: %d\n",
 			 __func__, bt->rx->state, bt->tx->state);
 		goto irq_handler_exit;
@@ -512,6 +514,42 @@ static irqreturn_t mtk_btcvsd_snd_irq_handler(int irq_id, void *dev)
 	buf_cnt_tx = btsco_packet_info[packet_type][2];
 	buf_cnt_rx = btsco_packet_info[packet_type][3];
 
+	if (bt->tx->state == BT_SCO_STATE_LOOPBACK) {
+		u8 *src, *dst;
+		unsigned long connsys_addr_rx, ap_addr_rx;
+		unsigned long connsys_addr_tx, ap_addr_tx;
+
+		connsys_addr_rx = *bt->bt_reg_pkt_r;
+		ap_addr_rx = (unsigned long)bt->bt_sram_bank2_base +
+			     (connsys_addr_rx & 0xFFFF);
+
+		connsys_addr_tx = *bt->bt_reg_pkt_w;
+		ap_addr_tx = (unsigned long)bt->bt_sram_bank2_base +
+			     (connsys_addr_tx & 0xFFFF);
+
+		if (connsys_addr_tx == 0xdeadfeed ||
+		    connsys_addr_rx == 0xdeadfeed) {
+			/* bt return 0xdeadfeed if read reg during bt sleep */
+			dev_warn(bt->dev, "%s(), connsys_addr_tx == 0xdeadfeed\n",
+				 __func__);
+			goto irq_handler_exit;
+		}
+
+		src = (u8 *)ap_addr_rx;
+		dst = (u8 *)ap_addr_tx;
+
+		mtk_btcvsd_snd_data_transfer(BT_SCO_DIRECT_BT2ARM, src,
+					     bt->tx->temp_packet_buf,
+					     packet_length,
+					     packet_num);
+		mtk_btcvsd_snd_data_transfer(BT_SCO_DIRECT_ARM2BT,
+					     bt->tx->temp_packet_buf, dst,
+					     packet_length,
+					     packet_num);
+		bt->rx->rw_cnt++;
+		bt->tx->rw_cnt++;
+	}
+
 	if (bt->rx->state == BT_SCO_STATE_RUNNING ||
 	    bt->rx->state == BT_SCO_STATE_ENDING) {
 		if (bt->rx->xrun) {
@@ -1067,6 +1105,33 @@ static int btcvsd_band_set(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+static int btcvsd_loopback_get(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+	bool lpbk_en = bt->tx->state == BT_SCO_STATE_LOOPBACK;
+
+	ucontrol->value.integer.value[0] = lpbk_en;
+	return 0;
+}
+
+static int btcvsd_loopback_set(struct snd_kcontrol *kcontrol,
+			       struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (ucontrol->value.integer.value[0]) {
+		mtk_btcvsd_snd_set_state(bt, bt->tx, BT_SCO_STATE_LOOPBACK);
+		mtk_btcvsd_snd_set_state(bt, bt->rx, BT_SCO_STATE_LOOPBACK);
+	} else {
+		mtk_btcvsd_snd_set_state(bt, bt->tx, BT_SCO_STATE_RUNNING);
+		mtk_btcvsd_snd_set_state(bt, bt->rx, BT_SCO_STATE_RUNNING);
+	}
+	return 0;
+}
+
 static int btcvsd_tx_mute_get(struct snd_kcontrol *kcontrol,
 			      struct snd_ctl_elem_value *ucontrol)
 {
@@ -1202,6 +1267,8 @@ static int btcvsd_tx_timestamp_get(struct snd_kcontrol *kcontrol,
 static const struct snd_kcontrol_new mtk_btcvsd_snd_controls[] = {
 	SOC_ENUM_EXT("BTCVSD Band", btcvsd_enum[0],
 		     btcvsd_band_get, btcvsd_band_set),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Loopback Switch", 0,
+			    btcvsd_loopback_get, btcvsd_loopback_set),
 	SOC_SINGLE_BOOL_EXT("BTCVSD Tx Mute Switch", 0,
 			    btcvsd_tx_mute_get, btcvsd_tx_mute_set),
 	SOC_SINGLE_BOOL_EXT("BTCVSD Tx Irq Received Switch", 0,
-- 
2.20.1