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From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
To: Linux-ALSA <alsa-devel@alsa-project.org>,
	hiroyuki.yokoyama.vx@renesas.com
Cc: Fukawa <tomoharu.fukawa.eb@renesas.com>,
	shiiba <naoya.shiiba.nx@renesas.com>,
	mitsuhiro.kimura.kc@renesas.com,
	sakato <ryusuke.sakato.bx@renesas.com>,
	hideya.tanaka.nx@renesas.com, tomohiro.komagata.aj@renesas.com,
	hiroki.negishi.bx@renesas.com, yuta.wakasawa.pv@renesas.com,
	ryo.kodama.vz@renesas.com, hien.dang.eb@renesas.com,
	Kihara <takeshi.kihara.df@renesas.com>,
	ryo.kataoka.wt@renesas.com,
	honda <takamitsu.honda.pv@renesas.com>,
	Chris.Paterson2@renesas.com, kouei.abe.cp@renesas.com,
	ren.imaoka.vj@renesas.com, goda <yusuke.goda.sx@renesas.com>,
	takashi.minami.xb@bp.renesas.com, takahiko.gomi.yn@renesas.com,
	khiem.nguyen.xt@renesas.com, atsushi.tamaki.ks@renesas.com,
	harunobu.kurokawa.dn@renesas.com
Subject: Question about hw_param with Ctrl-Z + fg
Date: Tue, 4 Apr 2017 00:54:30 +0000	[thread overview]
Message-ID: <87d1ctuhba.wl%kuninori.morimoto.gx@renesas.com> (raw)
In-Reply-To: <redmine.journal-967542.20170403100335.fbd6fae50d6ed2e5@dm.renesas.com>


Hi ALSA SoC ML

We noticed that 2nd hw_param on ALSA SoC isn't called if we used
Ctrl-Z + fg on aplay. hw_param is necessary especially if we use sampling
rate converter (it depends on .be_hw_params_fixup).
Ctrl-Z will use notmal STOP, and fg will use normal START,
thus it is impossible to distinction Ctrl-C (stop) or Ctrl-Z (temporary suspension).
Is this aplay issue ? or kernel issue ?

start/stop case
	- aplay xxx.wav
=>	- hw_param
	- SNDRV_PCM_TRIGGER_START
	- Ctrl-C (stop)	
	- SNDRV_PCM_TRIGGER_STOP

Ctrl-Z case
	- aplay xxx.wav
=>	- hw_param
	- SNDRV_PCM_TRIGGER_START
	- Ctrl-Z
	- SNDRV_PCM_TRIGGER_STOP
	- fg
=>	- ## no hw_param here
	- SNDRV_PCM_TRIGGER_START
	- Ctrl-C (stop)
	- SNDRV_PCM_TRIGGER_STOP

Best regards
---
Kuninori Morimoto

       reply	other threads:[~2017-04-04  0:54 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <redmine.issue-119657.20170403030456@dm.renesas.com>
     [not found] ` <redmine.journal-967542.20170403100335.fbd6fae50d6ed2e5@dm.renesas.com>
2017-04-04  0:54   ` Kuninori Morimoto [this message]
2017-04-04  4:10     ` Question about hw_param with Ctrl-Z + fg Takashi Sakamoto
2017-04-04  5:57       ` Kuninori Morimoto
2017-04-04  6:14         ` Takashi Sakamoto
2017-04-04  8:02           ` Kuninori Morimoto
2017-04-05  4:50             ` Kuninori Morimoto

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