linux-kernel - [PATCH v2] Bluetooth: hci_qca: wait for Pre shutdown complete event before sending the Power off pulse

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Date:   Fri, 30 Aug 2019 13:56:16 +0530
From:   Harish Bandi <c-hbandi@...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, bgodavar@...eaurora.org,
        anubhavg@...eaurora.org, Harish Bandi <c-hbandi@...eaurora.org>
Subject: [PATCH v2] Bluetooth: hci_qca: wait for Pre shutdown complete event before sending the Power off pulse

When SoC receives pre shut down command, it share the same
with other COEX shared clients. So SoC needs a short time
after sending VS pre shutdown command before turning off
the regulators and sending the power off pulse. Along with
short delay, needs to wait for command complete event for
Pre shutdown VS command

Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
---
Changes in V2:
- Modified commit text.
---
 drivers/bluetooth/btqca.c   | 22 ++++++++++++++++++++++
 drivers/bluetooth/hci_qca.c |  5 +++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index 8b33128..d48dc9e 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -99,6 +99,28 @@ static int qca_send_reset(struct hci_dev *hdev)
 	return 0;
 }
 
+int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+	int err;
+
+	bt_dev_dbg(hdev, "QCA pre shutdown cmd");
+
+	skb = __hci_cmd_sync_ev(hdev, QCA_PRE_SHUTDOWN_CMD, 0,
+				NULL, HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
+
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "QCA preshutdown_cmd failed (%d)", err);
+		return err;
+	}
+
+	kfree_skb(skb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qca_send_pre_shutdown_cmd);
+
 static void qca_tlv_check_data(struct rome_config *config,
 				const struct firmware *fw)
 {
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index ab4c18e..43df13c 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1367,6 +1367,11 @@ static int qca_power_off(struct hci_dev *hdev)
 {
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 
+	/* Perform pre shutdown command */
+	qca_send_pre_shutdown_cmd(hdev);
+
+	usleep_range(8000, 10000);
+
 	qca_power_shutdown(hu);
 	return 0;
 }
-- 
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