From patchwork Wed Jan 16 11:46:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Balakrishna Godavarthi X-Patchwork-Id: 10765809 X-Patchwork-Delegate: agross@codeaurora.org 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 233E013B4 for ; Wed, 16 Jan 2019 11:46:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 141382DDB4 for ; Wed, 16 Jan 2019 11:46:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 06BD22DD5F; Wed, 16 Jan 2019 11:46:43 +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 8957E2DD88 for ; Wed, 16 Jan 2019 11:46:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392498AbfAPLqc (ORCPT ); Wed, 16 Jan 2019 06:46:32 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:43406 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392489AbfAPLq3 (ORCPT ); Wed, 16 Jan 2019 06:46:29 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9515060886; Wed, 16 Jan 2019 11:46:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1547639188; bh=qTq48uH68Jm0lhJqFd02ROWOATP2y9qQULkYxeOZe6Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H2kGoQ/s5lp+hrHaxtEk2fUeSsLXDfRaMwWsi2DXhgSxX9gj1/JP1eASCIb09erdk UM29rXnpAB5B31/T/h/nxc7kORWJ6fsQcyEixhHFFfdrn+hckZPIGImpT471AoKlgC GIU6BJQFbaPL9Yt2qeDKe7sJC1RGSQT25ia1F+Zg= 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 F09CD6084F; Wed, 16 Jan 2019 11:46:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1547639187; bh=qTq48uH68Jm0lhJqFd02ROWOATP2y9qQULkYxeOZe6Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bQBQqbB/Q2t7ZywMgvvN0t1Z9VscGvGh11i6SdKnXMK8Q1ati08TPdntgjuPOqHTR jv7FgmXenglj44Kohj8HG/r6CZyFFmVKy7LIiIl3tsiBEu/YRzrJwcAsu6xj1BCMp0 tKAY5bo1MbuvZLxUVUhxwx10YDzKrNkEADuTnY2U= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org F09CD6084F 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 v8 2/3] Bluetooth: hci_qca: Deassert RTS while baudrate change command Date: Wed, 16 Jan 2019 17:16:02 +0530 Message-Id: <20190116114603.500-3-bgodavar@codeaurora.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190116114603.500-1-bgodavar@codeaurora.org> References: <20190116114603.500-1-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 --- Note: will keep this change for now. If any change required after further discussions i will update accordingly. --- drivers/bluetooth/hci_qca.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 681bfa30467e..7e4afcf40da2 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -964,7 +964,6 @@ 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) @@ -978,13 +977,6 @@ 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; @@ -1000,9 +992,6 @@ 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; } @@ -1091,6 +1080,7 @@ 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) { @@ -1102,6 +1092,15 @@ 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 prevent chip from transmitting its response with + * the new baudrate while the host port is still operating at + * the old speed. + */ + 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); @@ -1109,6 +1108,9 @@ 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;