linux-kernel - [PATCH] Bluetooth: hci_qca: Set SSR triggered flags when SSR command is sent out

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Date:   Mon, 16 Aug 2021 10:51:42 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com
Cc:     mka@...omium.org, linux-kernel@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, pharish@...eaurora.org,
        rjliao@...eaurora.org, hbandi@...eaurora.org,
        abhishekpandit@...omium.org, mcchou@...omium.org,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>
Subject: [PATCH] Bluetooth: hci_qca: Set SSR triggered flags when SSR command is sent out

This change sets SSR triggered flags when QCA SSR command is sent to
SoC. After the SSR command sent, driver discards the incoming data from
the upper layers. This way will ensure to read full dumps from the
BT SoC without any flow control issues due to excess of data receiving
from the HOST in audio usecases.

Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
---
 drivers/bluetooth/hci_qca.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 53deea2..5cbed6a 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -69,6 +69,8 @@
 #define QCA_LAST_SEQUENCE_NUM		0xFFFF
 #define QCA_CRASHBYTE_PACKET_LEN	1096
 #define QCA_MEMDUMP_BYTE		0xFB
+#define QCA_SSR_OPCODE			0xFC0C
+#define QCA_SSR_PKT_LEN		5
 
 enum qca_flags {
 	QCA_IBS_DISABLED,
@@ -871,6 +873,14 @@ static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 	/* Prepend skb with frame type */
 	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 
+	if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT &&
+	    skb->len == QCA_SSR_PKT_LEN &&
+	    hci_skb_opcode(skb) == QCA_SSR_OPCODE) {
+		bt_dev_info(hu->hdev, "Triggering ssr");
+		set_bit(QCA_SSR_TRIGGERED, &qca->flags);
+		set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
+	}
+
 	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
 
 	/* Don't go to sleep in middle of patch download or
-- 
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