linux-kernel - [PATCH v1] Bluetooth: hci_qca: wait for Pre shutdown to command complete event before sending the Power off pulse

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Date:   Thu,  8 Aug 2019 14:55:53 +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 v1] Bluetooth: hci_qca: wait for Pre shutdown to command 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.

Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
---
 drivers/bluetooth/btqca.c   | 5 +++--
 drivers/bluetooth/hci_qca.c | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index 2221935..f20991e 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -106,8 +106,9 @@ int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
 
 	bt_dev_dbg(hdev, "QCA pre shutdown cmd");
 
-	skb = __hci_cmd_sync(hdev, QCA_PRE_SHUTDOWN_CMD, 0,
-				NULL, HCI_INIT_TIMEOUT);
+	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);
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 16db6c0..566aa28 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1386,6 +1386,8 @@ static int qca_power_off(struct hci_dev *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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