From patchwork Thu Dec 27 07:31:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Balakrishna Godavarthi X-Patchwork-Id: 10743545 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 5AABE6C2 for ; Thu, 27 Dec 2018 07:32:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 470F02863C for ; Thu, 27 Dec 2018 07:32:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3A5472863F; Thu, 27 Dec 2018 07:32:38 +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 CCA8728640 for ; Thu, 27 Dec 2018 07:32:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729651AbeL0HcA (ORCPT ); Thu, 27 Dec 2018 02:32:00 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:49826 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727007AbeL0HcA (ORCPT ); Thu, 27 Dec 2018 02:32:00 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 5B1F96043F; Thu, 27 Dec 2018 07:31:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1545895919; bh=xA3muyaU7FMQCzEGI2NaU6Ty/IsAqK3qgHZSW4yIRbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AxJJDxutryn7M2wIQYPiuDsE1IWyfQH0NJWcDv8ylClsLZ7DCpNp/tqzb+CZlayCQ l7GiADJqwZ70Z37ZLAg41UY5+5GsL6ICJY7pVsspTgVTwZGxLDSzwahXfPNVZcozHN pLOOXrkn8XQFuAPuhazMbQxjnISUnQCaDb0z1pU0= 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 0484E6076A; Thu, 27 Dec 2018 07:31:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1545895912; bh=xA3muyaU7FMQCzEGI2NaU6Ty/IsAqK3qgHZSW4yIRbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SsSnnYpoOcs3ded7ArHcn/O2t9yPpV81GweEsGLZ7CVBi1B+yAlx156Fg8PNU++xk j4MLqdhSCsMSQK5s79rF3Sf49kYlfHKc8kiCWH/oobtJ6Kds1lxzwF25fZo19xRnbx Z1DUQz3obTOoCBs0ngtIvfeXVkNj+73s4pR8Romg= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0484E6076A 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 v6 2/6] Bluetooth: hci_qca: Deassert RTS while baudrate change command Date: Thu, 27 Dec 2018 13:01:32 +0530 Message-Id: <20181227073136.8431-3-bgodavar@codeaurora.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181227073136.8431-1-bgodavar@codeaurora.org> References: <20181227073136.8431-1-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 --- 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 507a2355c758..63436023632d 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; } @@ -1087,6 +1076,7 @@ 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) { @@ -1098,6 +1088,15 @@ 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); @@ -1105,6 +1104,9 @@ 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;