linux-kernel - [PATCH 4.18 083/158] ASoC: soc-pcm: Use delay set in component pointer function

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Date:   Tue, 18 Sep 2018 00:41:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Akshu Agrawal <akshu.agrawal@....com>,
        Takashi Iwai <tiwai@...e.de>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 083/158] ASoC: soc-pcm: Use delay set in component pointer function

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Akshu Agrawal <akshu.agrawal@....com>

[ Upstream commit 9fb4c2bf130b922c77c16a8368732699799c40de ]

Take into account the base delay set in pointer callback.

There are cases where a pointer function populates
runtime->delay, such as:
./sound/pci/hda/hda_controller.c
./sound/soc/intel/atom/sst-mfld-platform-pcm.c

This delay was getting lost and was overwritten by delays
from codec or cpu dai delay function if exposed.

Now,
Total delay = base delay + cpu_dai delay + codec_dai delay

Signed-off-by: Akshu Agrawal <akshu.agrawal@....com>
Reviewed-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/soc-pcm.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1165,6 +1165,9 @@ static snd_pcm_uframes_t soc_pcm_pointer
 	snd_pcm_sframes_t codec_delay = 0;
 	int i;
 
+	/* clearing the previous total delay */
+	runtime->delay = 0;
+
 	for_each_rtdcom(rtd, rtdcom) {
 		component = rtdcom->component;
 
@@ -1176,6 +1179,8 @@ static snd_pcm_uframes_t soc_pcm_pointer
 		offset = component->driver->ops->pointer(substream);
 		break;
 	}
+	/* base delay if assigned in pointer callback */
+	delay = runtime->delay;
 
 	if (cpu_dai->driver->ops->delay)
 		delay += cpu_dai->driver->ops->delay(substream, cpu_dai);