From patchwork Tue Sep 1 14:24:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Venkata Lakshmi Narayana Gubba X-Patchwork-Id: 11748353 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 43C1313B6 for ; Tue, 1 Sep 2020 14:26:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 300A1206EB for ; Tue, 1 Sep 2020 14:26:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728301AbgIAOZ4 (ORCPT ); Tue, 1 Sep 2020 10:25:56 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:49591 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728060AbgIAOZJ (ORCPT ); Tue, 1 Sep 2020 10:25:09 -0400 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 01 Sep 2020 07:24:59 -0700 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 01 Sep 2020 07:24:57 -0700 Received: from gubbaven-linux.qualcomm.com ([10.206.64.32]) by ironmsg02-blr.qualcomm.com with ESMTP; 01 Sep 2020 19:54:32 +0530 Received: by gubbaven-linux.qualcomm.com (Postfix, from userid 2365015) id E3F8E217CB; Tue, 1 Sep 2020 19:54:30 +0530 (IST) From: Venkata Lakshmi Narayana Gubba To: marcel@holtmann.org, johan.hedberg@gmail.com Cc: mka@chromium.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, hemantg@codeaurora.org, linux-arm-msm@vger.kernel.org, bgodavar@codeaurora.org, rjliao@codeaurora.org, hbandi@codeaurora.org, abhishekpandit@chromium.org, Venkata Lakshmi Narayana Gubba Subject: [PATCH v1 1/2] Bluetooth: hci_serdev: Close UART port if NON_PERSISTENT_SETUP is set Date: Tue, 1 Sep 2020 19:54:26 +0530 Message-Id: <1598970267-7170-2-git-send-email-gubbaven@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1598970267-7170-1-git-send-email-gubbaven@codeaurora.org> References: <1598970267-7170-1-git-send-email-gubbaven@codeaurora.org> Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org When HCI_QUIRK_NON_PERSISTENT_SETUP is set by drivers, it indicates that BT SoC will be completely powered OFF during BT OFF. On next BT ON firmware must be downloaded again. Holding UART port open during BT OFF is draining the battery. Now during BT OFF, UART port is closed if qurik HCI_QUIRK_NON_PERSISTENT_SETUP is set by clearing HCI_UART_PROTO_READY proto flag. On next BT ON, UART port is opened if HCI_UART_PROTO_READY proto flag is cleared. Signed-off-by: Venkata Lakshmi Narayana Gubba --- drivers/bluetooth/hci_serdev.c | 36 +++++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c index 3977bba..ef96ad0 100644 --- a/drivers/bluetooth/hci_serdev.c +++ b/drivers/bluetooth/hci_serdev.c @@ -113,8 +113,22 @@ static int hci_uart_flush(struct hci_dev *hdev) /* Initialize device */ static int hci_uart_open(struct hci_dev *hdev) { + struct hci_uart *hu = hci_get_drvdata(hdev); + int err; + BT_DBG("%s %p", hdev->name, hdev); + /* When Quirk HCI_QUIRK_NON_PERSISTENT_SETUP is set by + * driver, BT SoC is completely turned OFF during + * BT OFF. Upon next BT ON UART port should be opened. + */ + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) { + err = serdev_device_open(hu->serdev); + if (err) + return err; + set_bit(HCI_UART_PROTO_READY, &hu->flags); + } + /* Undo clearing this from hci_uart_close() */ hdev->flush = hci_uart_flush; @@ -124,11 +138,25 @@ static int hci_uart_open(struct hci_dev *hdev) /* Close device */ static int hci_uart_close(struct hci_dev *hdev) { + struct hci_uart *hu = hci_get_drvdata(hdev); + BT_DBG("hdev %p", hdev); + if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) + return 0; + hci_uart_flush(hdev); hdev->flush = NULL; + /* When QUIRK HCI_QUIRK_NON_PERSISTENT_SETUP is set by driver, + * BT SOC is completely powered OFF during BT OFF, holding port + * open may drain the battery. + */ + if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) { + clear_bit(HCI_UART_PROTO_READY, &hu->flags); + serdev_device_close(hu->serdev); + } + return 0; } @@ -354,8 +382,6 @@ void hci_uart_unregister_device(struct hci_uart *hu) { struct hci_dev *hdev = hu->hdev; - clear_bit(HCI_UART_PROTO_READY, &hu->flags); - cancel_work_sync(&hu->init_ready); if (test_bit(HCI_UART_REGISTERED, &hu->flags)) hci_unregister_dev(hdev); @@ -364,6 +390,10 @@ void hci_uart_unregister_device(struct hci_uart *hu) cancel_work_sync(&hu->write_work); hu->proto->close(hu); - serdev_device_close(hu->serdev); + + if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) { + clear_bit(HCI_UART_PROTO_READY, &hu->flags); + serdev_device_close(hu->serdev); + } } EXPORT_SYMBOL_GPL(hci_uart_unregister_device);