[alsa-devel] Applied "ASoC: SOF: Intel: hda: reset link DMA state in prepare" to the asoc tree

[Mark Brown]

The patch

   ASoC: SOF: Intel: hda: reset link DMA state in prepare

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.4

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From a3ebccb52efdfb3459fa51516238cc464ee310c9 Mon Sep 17 00:00:00 2001
From: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Date: Mon, 22 Jul 2019 09:13:58 -0500
Subject: [PATCH] ASoC: SOF: Intel: hda: reset link DMA state in prepare

When application goes through SUSPEND/STOP->PREPARE->START
cycle, we should always reprogram the DAI link DMA to ensure
it is in sync with the host PCM DMA.

Use same state tracking logic to handle both restart and
system resume flows. Use link_prepared field of
'struct hdac_ext_stream' to store the state, instead of
adding redundant fields to SOF specific structs.

Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
Link: https://lore.kernel.org/r/20190722141402.7194-18-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie at kernel.org>
---
 sound/soc/sof/intel/hda-dai.c |  8 +++-----
 sound/soc/sof/intel/hda-dsp.c | 17 ++++++-----------
 sound/soc/sof/intel/hda.h     |  1 -
 3 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c
index a514f9cf5c9a..a448be60f6dd 100644
--- a/sound/soc/sof/intel/hda-dai.c
+++ b/sound/soc/sof/intel/hda-dai.c
@@ -226,8 +226,6 @@ static int hda_link_hw_params(struct snd_pcm_substream *substream,
 
 	snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);
 
-	hda_stream->hw_params_upon_resume = 0;
-
 	link = snd_hdac_ext_bus_get_link(bus, codec_dai->component->name);
 	if (!link)
 		return -EINVAL;
@@ -267,8 +265,7 @@ static int hda_link_pcm_prepare(struct snd_pcm_substream *substream,
 
 	hda_stream = hstream_to_sof_hda_stream(link_dev);
 
-	/* setup hw_params again only if resuming from system suspend */
-	if (!hda_stream->hw_params_upon_resume)
+	if (link_dev->link_prepared)
 		return 0;
 
 	dev_dbg(sdev->dev, "hda: prepare stream dir %d\n", substream->stream);
@@ -317,6 +314,7 @@ static int hda_link_pcm_trigger(struct snd_pcm_substream *substream,
 		snd_hdac_ext_link_stream_start(link_dev);
 		break;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
 		/*
 		 * clear and release link DMA channel. It will be assigned when
 		 * hw_params is set up again after resume.
@@ -329,10 +327,10 @@ static int hda_link_pcm_trigger(struct snd_pcm_substream *substream,
 		snd_hdac_ext_link_clear_stream_id(link, stream_tag);
 		snd_hdac_ext_stream_release(link_dev,
 					    HDAC_EXT_STREAM_TYPE_LINK);
+		link_dev->link_prepared = 0;
 
 		/* fallthrough */
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-	case SNDRV_PCM_TRIGGER_STOP:
 		snd_hdac_ext_link_stream_clear(link_dev);
 		break;
 	default:
diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index f08a5d649346..e82ecaad1763 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -425,25 +425,19 @@ int hda_dsp_suspend(struct snd_sof_dev *sdev)
 
 int hda_dsp_set_hw_params_upon_resume(struct snd_sof_dev *sdev)
 {
-	struct hdac_bus *bus = sof_to_bus(sdev);
-	struct sof_intel_hda_stream *hda_stream;
-	struct hdac_ext_stream *stream;
-	struct hdac_stream *s;
-
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+	struct hdac_bus *bus = sof_to_bus(sdev);
 	struct snd_soc_pcm_runtime *rtd;
+	struct hdac_ext_stream *stream;
 	struct hdac_ext_link *link;
+	struct hdac_stream *s;
 	const char *name;
 	int stream_tag;
-#endif
 
 	/* set internal flag for BE */
 	list_for_each_entry(s, &bus->stream_list, list) {
 		stream = stream_to_hdac_ext_stream(s);
-		hda_stream = container_of(stream, struct sof_intel_hda_stream,
-					  hda_stream);
-		hda_stream->hw_params_upon_resume = 1;
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+
 		/*
 		 * clear and release stream. This should already be taken care
 		 * for running streams when the SUSPEND trigger is called.
@@ -460,8 +454,9 @@ int hda_dsp_set_hw_params_upon_resume(struct snd_sof_dev *sdev)
 			snd_hdac_ext_link_clear_stream_id(link, stream_tag);
 			snd_hdac_ext_stream_release(stream,
 						    HDAC_EXT_STREAM_TYPE_LINK);
+			stream->link_prepared = 0;
 		}
-#endif
 	}
+#endif
 	return 0;
 }
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index 028e865d5e20..ceaaa8d467f4 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -418,7 +418,6 @@ struct sof_intel_hda_stream {
 	struct snd_sof_dev *sdev;
 	struct hdac_ext_stream hda_stream;
 	struct sof_intel_stream stream;
-	int hw_params_upon_resume; /* set up hw_params upon resume */
 	int host_reserved; /* reserve host DMA channel */
 };
 
-- 
2.20.1