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BACKPORT: driver: bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw #465

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BACKPORT: driver: bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw #465

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18 changes: 18 additions & 0 deletions drivers/bluetooth/hci_qca.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1653,6 +1653,24 @@ static void qca_hw_error(struct hci_dev *hdev, u8 code)
}

clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);

/*
* If the SoC always enables the bt_en pin via hardware and the driver
* cannot control the bt_en pin of the SoC chip, then during SSR,
* the QCA_SSR_TRIGGERED and QCA_IBS_DISABLED bits cannot be cleared.
* This leads to a reset command timeout failure.
*
* To address this, clear QCA_SSR_TRIGGERED and QCA_IBS_DISABLED bits
* after the coredump collection is complete.
* Also, add msleep delay to wait for controller to complete SSR.
*/
if (!hci_test_quirk(hu->hdev, HCI_QUIRK_NON_PERSISTENT_SETUP)) {
clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
clear_bit(QCA_IBS_DISABLED, &qca->flags);
qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
qca->memdump_state = QCA_MEMDUMP_IDLE;
msleep(50);
}
}

static void qca_reset(struct hci_dev *hdev)
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