From e582f4832a9ee27d92502b58f3a1b3331457e8bb Mon Sep 17 00:00:00 2001
From: Keyon Jie <yang.jie@linux.intel.com>
Date: Fri, 28 Feb 2020 17:18:47 -0600
Subject: [PATCH] ASoC: SOF: pcm: skip DMA buffer pre-allocation
Git-commit: e582f4832a9ee27d92502b58f3a1b3331457e8bb
Patch-mainline: v5.7-rc1
References: jsc#SLE-16518
As discussion in ALSA https://patchwork.kernel.org/patch/11336023/, it
is suggested to skip DMA buffer pre-allocation with passing size=0 when
calling snd_pcm_set_managed_buffer(), to make the full buffer_bytes
range configured in topology file selectable from user space, here do
the corresponding change in SOF PCM driver to implement it.
This change doesn't have dependency to the change that Takashi will do
in the ALSA core by adding total_pcm_alloc_bytes limitation to the
struct snd_card, it passes tests both with or without Takashi's coming
change on SOF CML platform.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Link: https://lore.kernel.org/r/20200228231850.9226-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
sound/soc/sof/pcm.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c
index b239bbff4b5c..f4769e19965a 100644
--- a/sound/soc/sof/pcm.c
+++ b/sound/soc/sof/pcm.c
@@ -601,8 +601,7 @@ static int sof_pcm_new(struct snd_soc_component *component,
snd_pcm_set_managed_buffer(pcm->streams[stream].substream,
SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
- le32_to_cpu(caps->buffer_size_min),
- le32_to_cpu(caps->buffer_size_max));
+ 0, le32_to_cpu(caps->buffer_size_max));
capture:
stream = SNDRV_PCM_STREAM_CAPTURE;
@@ -624,8 +623,7 @@ static int sof_pcm_new(struct snd_soc_component *component,
snd_pcm_set_managed_buffer(pcm->streams[stream].substream,
SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
- le32_to_cpu(caps->buffer_size_min),
- le32_to_cpu(caps->buffer_size_max));
+ 0, le32_to_cpu(caps->buffer_size_max));
return 0;
}
--
2.16.4