From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars-Peter Clausen Subject: [PATCH 2/2] ASoC: dapm: Fix SUSPEND -> OFF bias sequence Date: Sun, 4 May 2014 19:17:06 +0200 Message-ID: <1399223826-28522-2-git-send-email-lars@metafoo.de> References: <1399223826-28522-1-git-send-email-lars@metafoo.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp-out-167.synserver.de (smtp-out-180.synserver.de [212.40.185.180]) by alsa0.perex.cz (Postfix) with ESMTP id C19BE26089A for ; Sun, 4 May 2014 19:17:12 +0200 (CEST) In-Reply-To: <1399223826-28522-1-git-send-email-lars@metafoo.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Mark Brown , Liam Girdwood Cc: alsa-devel@alsa-project.org, Lars-Peter Clausen List-Id: alsa-devel@alsa-project.org Currently when the DAPM context bias level is SUSPEND and the target bias level is OFF dapm_pre_sequence_async() will first transition to PREPARE and dapm_post_sequence_async() will then transition back from PREPARE to STANDBY and then to OFF. This patch makes sure that dapm_pre_sequence_async() only transitions to PREPARE when either going to ON or away from ON. This avoids the extra unnecessary transitions. Signed-off-by: Lars-Peter Clausen --- Given that SUSPEND -> OFF transitions are rather rare and the code will still work correctly (but inefficent) without this patch, the patch probably does not need to go into stable. --- sound/soc/soc-dapm.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 5d54dfc..562cea8 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1549,8 +1549,11 @@ static void dapm_pre_sequence_async(void *data, async_cookie_t cookie) "ASoC: Failed to turn on bias: %d\n", ret); } - /* Prepare for a STADDBY->ON or ON->STANDBY transition */ - if (d->bias_level != d->target_bias_level) { + /* Prepare for a transition to ON or away from ON */ + if ((d->target_bias_level == SND_SOC_BIAS_ON && + d->bias_level != SND_SOC_BIAS_ON) || + (d->target_bias_level != SND_SOC_BIAS_ON && + d->bias_level == SND_SOC_BIAS_ON)) { ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE); if (ret != 0) dev_err(d->dev, -- 1.8.0