From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: [PATCH 2/4] ASoC: Only run power_check() on a widget once per run Date: Tue, 4 Oct 2011 23:01:23 +0100 Message-ID: <1317765685-8683-2-git-send-email-broonie@opensource.wolfsonmicro.com> References: <1317765685-8683-1-git-send-email-broonie@opensource.wolfsonmicro.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from opensource.wolfsonmicro.com (opensource.wolfsonmicro.com [80.75.67.52]) by alsa0.perex.cz (Postfix) with ESMTP id 62000103998 for ; Wed, 5 Oct 2011 00:01:30 +0200 (CEST) In-Reply-To: <1317765685-8683-1-git-send-email-broonie@opensource.wolfsonmicro.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Liam Girdwood Cc: alsa-devel@alsa-project.org, patches@opensource.wolfsonmicro.com, Mark Brown List-Id: alsa-devel@alsa-project.org Some widgets will get power_check() run on them more than once during a DAPM run, most commonly due to supply widgets checking to see if their consumers are powered up. It's wasteful to do this so cache the result of power_check() during a run. For one system I tested this on I got an improvement of: Power Path Neighbour Before: 106 970 1186 After: 69 727 905 from this. Signed-off-by: Mark Brown --- include/sound/soc-dapm.h | 2 ++ sound/soc/soc-dapm.c | 15 +++++++++++++-- 2 files changed, 15 insertions(+), 2 deletions(-) diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h index c080635..e2853da 100644 --- a/include/sound/soc-dapm.h +++ b/include/sound/soc-dapm.h @@ -473,6 +473,8 @@ struct snd_soc_dapm_widget { unsigned char ext:1; /* has external widgets */ unsigned char force:1; /* force state */ unsigned char ignore_suspend:1; /* kept enabled over suspend */ + unsigned char new_power:1; /* power from this run */ + unsigned char power_checked:1; /* power checked this run */ int subseq; /* sort within widget type */ int (*power_check)(struct snd_soc_dapm_widget *w); diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index e6a0882..c39146d 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -787,10 +787,17 @@ EXPORT_SYMBOL_GPL(dapm_reg_event); static int dapm_widget_power_check(struct snd_soc_dapm_widget *w) { + if (w->power_checked) + return w->new_power; + if (w->force) - return 1; + w->new_power = 1; else - return w->power_check(w); + w->new_power = w->power_check(w); + + w->power_checked = true; + + return w->new_power; } /* Generic check to see if a widget should be powered. @@ -1322,6 +1329,10 @@ static int dapm_power_widgets(struct snd_soc_dapm_context *dapm, int event) memset(&card->dapm_stats, 0, sizeof(card->dapm_stats)); + list_for_each_entry(w, &card->widgets, list) { + w->power_checked = false; + } + /* Check which widgets we need to power and store them in * lists indicating if they should be powered up or down. We * only check widgets that have been flagged as dirty but note -- 1.7.6.3