From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A99A9C43441 for ; Mon, 26 Nov 2018 19:05:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D95020817 for ; Mon, 26 Nov 2018 19:05:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="K9qZWXLP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D95020817 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-bluetooth-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726397AbeK0GAT (ORCPT ); Tue, 27 Nov 2018 01:00:19 -0500 Received: from mail-pf1-f195.google.com ([209.85.210.195]:35844 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725723AbeK0GAT (ORCPT ); Tue, 27 Nov 2018 01:00:19 -0500 Received: by mail-pf1-f195.google.com with SMTP id b85so7044530pfc.3 for ; Mon, 26 Nov 2018 11:05:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=OWNqEkqpKl4WT7B6IGt+53Wt8VkERsOTBdUuXdHPFSo=; b=K9qZWXLPg0OuTE77bmwfiSOcVJgsB+oFhQK15uBcKKxF4452/c+EydbpMArkmKRH9T eWQ0hvYykSfpfY8DWJ/us7bdzuaqFascj8/Nq9CP36Rg8V6YggOOFRKKsbiA2kkCWnp7 EJjbl/kBb4GsJgJ66NGS+ZV89wRSok9jf/BP8= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=OWNqEkqpKl4WT7B6IGt+53Wt8VkERsOTBdUuXdHPFSo=; b=q97xeOoJnOCypmuMwS0ZWdAAFJlDs8kpkDwE1kopFinvAFBNUlbsUfzK7tWBhq7EAL MICPNjP6o2/7BPPe6i94TqdTrbb29UKditQD3KMH11FLO10f9euGmXm1p7ybUi7IQIOd A03xb/Sg+Klw0JSA98sBLNiY6Dqvi9RlFA5dCP3SXSqDY6Qd1GxOzjDwPr++18MLjqhD Oc31PSswbU/ETSfMahYjzHkv44CAhJoqlNdJfGHqBcoGsVIz7OwZIOUBjQnZnDm6KrBA pQpIy2he4iU6VtRtKuoab8S+LGIMY73KEAxalnSdIROHfauHzeZV/DqbV/bX/YPztVub gdjw== X-Gm-Message-State: AGRZ1gKwCYcFXRDwsffoFBs/dCANqjgppOA7t+BtHe4b/1NgktiY1/Xt xQsnid3qFTTaorYBZ0+BqExJWA== X-Google-Smtp-Source: AFSGD/WF+2d59ctkZWeeTS9vL6D5mAZ4Prz/mqp3N25kkp8cSiSK00Bd+DUdNKfnbl3LjuFzeC3QmQ== X-Received: by 2002:a63:a112:: with SMTP id b18mr26230872pgf.440.1543259116954; Mon, 26 Nov 2018 11:05:16 -0800 (PST) Received: from localhost ([2620:15c:202:1:b6af:f85:ed6c:ac6a]) by smtp.gmail.com with ESMTPSA id b5sm1407338pfc.150.2018.11.26.11.05.15 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 26 Nov 2018 11:05:16 -0800 (PST) Date: Mon, 26 Nov 2018 11:05:15 -0800 From: Matthias Kaehlcke To: Balakrishna Godavarthi Cc: marcel@holtmann.org, johan.hedberg@gmail.com, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, hemantg@codeaurora.org, linux-arm-msm@vger.kernel.org Subject: Re: [PATCH v2 1/3] Bluetooth: hci_qca: use wait_until_sent() for power pulses Message-ID: <20181126190515.GV22824@google.com> References: <20181122121512.13136-1-bgodavar@codeaurora.org> <20181122121512.13136-2-bgodavar@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20181122121512.13136-2-bgodavar@codeaurora.org> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org On Thu, Nov 22, 2018 at 05:45:10PM +0530, Balakrishna Godavarthi wrote: > wcn3990 requires a power pulse to turn ON/OFF along with > regulators. Sometimes we are observing the power pulses are sent > out with some time delay, due to queuing these commands. This is > causing synchronization issues with chip, which intern delay the > chip setup or may end up with communication issues. > > Signed-off-by: Balakrishna Godavarthi > --- > v2: > * Updated function qca_send_power_pulse() > * addressed reviewer comments. These unspecific descriptions require people to open v1, read through the comments and assume you addressed all of them. Better describe briefly what the actual changes are. > v1: > * initial patch > > --- > drivers/bluetooth/hci_qca.c | 37 +++++++++++++------------------------ > 1 file changed, 13 insertions(+), 24 deletions(-) > > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c > index f036c8f98ea3..f5dd323c1967 100644 > --- a/drivers/bluetooth/hci_qca.c > +++ b/drivers/bluetooth/hci_qca.c > @@ -1013,11 +1013,9 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) > hci_uart_set_baudrate(hu, speed); > } > > -static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd) > +static int qca_send_power_pulse(struct hci_uart *hu, u8 cmd) > { > - struct hci_uart *hu = hci_get_drvdata(hdev); > - struct qca_data *qca = hu->priv; > - struct sk_buff *skb; > + int ret; > > /* These power pulses are single byte command which are sent > * at required baudrate to wcn3990. On wcn3990, we have an external > @@ -1029,19 +1027,16 @@ static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd) > * save power. Disabling hardware flow control is mandatory while > * sending power pulses to SoC. > */ > - bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd); > - > - skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL); > - if (!skb) > - return -ENOMEM; > - > + bt_dev_dbg(hu->hdev, "sending power pulse %02x to SoC", cmd); > hci_uart_set_flow_control(hu, true); > + ret = serdev_device_write(hu->serdev, &cmd, sizeof(cmd), 0); > + if (ret < 0) { > + bt_dev_err(hu->hdev, "failed to send power pulse %02x to SoC", > + cmd); Re-enable flow control? The controller or serial port might be in a non-operational state anyway, but better not complicate matters further. Cheers Matthias