From patchwork Thu Jul 19 11:22:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jorge Sanjuan X-Patchwork-Id: 10534209 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 53BA2603B5 for ; Thu, 19 Jul 2018 11:24:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 40F32283FE for ; Thu, 19 Jul 2018 11:24:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3493D294F9; Thu, 19 Jul 2018 11:24:06 +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=-2.1 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE,RDNS_NONE autolearn=no version=3.3.1 Received: from alsa0.perex.cz (unknown [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7AB3B283FE for ; Thu, 19 Jul 2018 11:24:05 +0000 (UTC) Received: from alsa.alsa-project.org (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id B06512678CE; Thu, 19 Jul 2018 13:23:35 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 5C46926788E; Thu, 19 Jul 2018 13:22:25 +0200 (CEST) Received: from imap1.codethink.co.uk (imap1.codethink.co.uk [176.9.8.82]) by alsa0.perex.cz (Postfix) with ESMTP id 3946226789C for ; Thu, 19 Jul 2018 13:22:19 +0200 (CEST) Received: from [148.252.241.226] (helo=ct-lt-1121.office.codethink.co.uk) by imap1.codethink.co.uk with esmtpsa (Exim 4.84_2 #1 (Debian)) id 1fg70l-0004fU-Az; Thu, 19 Jul 2018 12:22:19 +0100 From: Jorge Sanjuan To: tiwai@suse.de Date: Thu, 19 Jul 2018 12:22:14 +0100 Message-Id: <20180719112215.4219-4-jorge.sanjuan@codethink.co.uk> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180719112215.4219-1-jorge.sanjuan@codethink.co.uk> References: <20180719112215.4219-1-jorge.sanjuan@codethink.co.uk> Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [alsa-devel] [PATCH 3/4] ALSA: usb-audio: Operate UAC3 Power Domains in PCM callbacks X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP Make use of UAC3 Power Domains associated to an Audio Streaming path within the PCM's logic. This means, when there is no audio being transferred (pcm is closed), the host will set the Power Domain associated to that substream to state D1. When audio is being transferred (from hw_params onwards), the Power Domain will be set to D0 state. This is the way the host lets the device now which Terminal is going to be actively used and it is for the device to manage its own internal resources on that UAC3 Power Domain. Signed-off-by: Jorge Sanjuan --- sound/usb/pcm.c | 34 +++++++++++++++++++++++++++++++--- sound/usb/stream.c | 6 +++++- 2 files changed, 36 insertions(+), 4 deletions(-) diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 4b930fa47277..0ae5f539706d 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -711,6 +711,24 @@ static int configure_endpoint(struct snd_usb_substream *subs) return ret; } +static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state) +{ + int ret; + + if (!subs->str_pd) + return 0; + + ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state); + if (ret < 0) { + dev_err(&subs->dev->dev, + "Cannot change Power Domain ID: %d to state: %d. Err: %d\n", + subs->str_pd->pd_id, state, ret); + return ret; + } + + return 0; +} + /* * hw_params callback * @@ -755,16 +773,22 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream, ret = snd_usb_lock_shutdown(subs->stream->chip); if (ret < 0) return ret; + ret = set_format(subs, fmt); - snd_usb_unlock_shutdown(subs->stream->chip); if (ret < 0) - return ret; + goto unlock; + + ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0); + if (ret < 0) + goto unlock; subs->interface = fmt->iface; subs->altset_idx = fmt->altset_idx; subs->need_setup_ep = true; - return 0; + unlock: + snd_usb_unlock_shutdown(subs->stream->chip); + return ret; } /* @@ -1265,6 +1289,7 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream) int direction = substream->stream; struct snd_usb_stream *as = snd_pcm_substream_chip(substream); struct snd_usb_substream *subs = &as->substream[direction]; + int ret; stop_endpoints(subs, true); @@ -1273,7 +1298,10 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream) !snd_usb_lock_shutdown(subs->stream->chip)) { usb_set_interface(subs->dev, subs->interface, 0); subs->interface = -1; + ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1); snd_usb_unlock_shutdown(subs->stream->chip); + if (ret < 0) + return ret; } subs->pcm_substream = NULL; diff --git a/sound/usb/stream.c b/sound/usb/stream.c index 031878a2a481..96402ca87aa5 100644 --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -110,8 +110,12 @@ static void snd_usb_init_substream(struct snd_usb_stream *as, if (fp->channels > subs->channels_max) subs->channels_max = fp->channels; - if (pd) + if (pd) { subs->str_pd = pd; + /* Initialize Power Domain to idle status D1 */ + snd_usb_power_domain_set(subs->stream->chip, pd, + UAC3_PD_STATE_D1); + } snd_usb_preallocate_buffer(subs); }