From patchwork Thu Nov 22 12:15:11 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Balakrishna Godavarthi X-Patchwork-Id: 10694061 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 238C215A7 for ; Thu, 22 Nov 2018 12:15:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0F5FA2C743 for ; Thu, 22 Nov 2018 12:15:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 03A452C75A; Thu, 22 Nov 2018 12:15:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8C6932C743 for ; Thu, 22 Nov 2018 12:15:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436678AbeKVWyj (ORCPT ); Thu, 22 Nov 2018 17:54:39 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:59462 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2436604AbeKVWyi (ORCPT ); Thu, 22 Nov 2018 17:54:38 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id DB16C60791; Thu, 22 Nov 2018 12:15:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542888929; bh=yoiGZNkf2VEQwlTtZsSeCOg4juHyQik5+O2IiPM16E4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g+4PBeaQNNL3lgzPYgT5SaZQvUpRMJjcYKvSQBF4JFwpfkrldk/K30jy5n7iG2YuV iSEAc/qgHN7hy90D1Lb+rsXzH+dG6mwcvKItB/qSbVkJ4WR/MzWZqlJwihULwVY/Sp lI7sBRQffWuFmlrVN2c5yN1traxYdCwJMVXgzLwA= Received: from bgodavar-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bgodavar@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 85D7460B11; Thu, 22 Nov 2018 12:15:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542888929; bh=yoiGZNkf2VEQwlTtZsSeCOg4juHyQik5+O2IiPM16E4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g+4PBeaQNNL3lgzPYgT5SaZQvUpRMJjcYKvSQBF4JFwpfkrldk/K30jy5n7iG2YuV iSEAc/qgHN7hy90D1Lb+rsXzH+dG6mwcvKItB/qSbVkJ4WR/MzWZqlJwihULwVY/Sp lI7sBRQffWuFmlrVN2c5yN1traxYdCwJMVXgzLwA= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 85D7460B11 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=bgodavar@codeaurora.org From: Balakrishna Godavarthi 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, Balakrishna Godavarthi Subject: [PATCH v2 2/3] Bluetooth: hci_qca: Deassert RTS while baudrate change command Date: Thu, 22 Nov 2018 17:45:11 +0530 Message-Id: <20181122121512.13136-3-bgodavar@codeaurora.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181122121512.13136-1-bgodavar@codeaurora.org> References: <20181122121512.13136-1-bgodavar@codeaurora.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch will help to stop frame reassembly errors while changing the baudrate. This is because host send a change baudrate request command to the chip with 115200 bps, Whereas chip will change their UART clocks to the enable for new baudrate and sends the response for the change request command with newer baudrate, On host side we are still operating in 115200 bps which results of reading garbage data. Here we are pulling RTS line, so that chip we will wait to send data to host until host change its baudrate. Signed-off-by: Balakrishna Godavarthi Tested-by: Matthias Kaehlcke Reviewed-by: Matthias Kaehlcke --- v2: * updated commit text and comments. v1: * initial patch --- drivers/bluetooth/hci_qca.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index f5dd323c1967..ed905ea1c58a 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -963,7 +963,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) struct hci_uart *hu = hci_get_drvdata(hdev); struct qca_data *qca = hu->priv; struct sk_buff *skb; - struct qca_serdev *qcadev; u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 }; if (baudrate > QCA_BAUDRATE_3200000) @@ -977,13 +976,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) return -ENOMEM; } - /* Disabling hardware flow control is mandatory while - * sending change baudrate request to wcn3990 SoC. - */ - qcadev = serdev_device_get_drvdata(hu->serdev); - if (qcadev->btsoc_type == QCA_WCN3990) - hci_uart_set_flow_control(hu, true); - /* Assign commands to change baudrate and packet type. */ skb_put_data(skb, cmd, sizeof(cmd)); hci_skb_pkt_type(skb) = HCI_COMMAND_PKT; @@ -999,9 +991,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS)); set_current_state(TASK_RUNNING); - if (qcadev->btsoc_type == QCA_WCN3990) - hci_uart_set_flow_control(hu, false); - return 0; } @@ -1086,6 +1075,7 @@ static int qca_check_speeds(struct hci_uart *hu) static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) { unsigned int speed, qca_baudrate; + struct qca_serdev *qcadev; int ret; if (speed_type == QCA_INIT_SPEED) { @@ -1097,6 +1087,14 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) if (!speed) return 0; + /* Deassert RTS while changing the baudrate of chip and host. + * This will stop chip to transmit it response with an newer + * baudrate until we change the baudarte. + */ + qcadev = serdev_device_get_drvdata(hu->serdev); + if (qcadev->btsoc_type == QCA_WCN3990) + serdev_device_set_rts(hu->serdev, false); + qca_baudrate = qca_get_baudrate_value(speed); bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed); ret = qca_set_baudrate(hu->hdev, qca_baudrate); @@ -1104,6 +1102,9 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type) return ret; host_set_baudrate(hu, speed); + + if (qcadev->btsoc_type == QCA_WCN3990) + serdev_device_set_rts(hu->serdev, true); } return 0;