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ASoC: dmaengine: Introduce module option prealloc_buffer_size_kbytes

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Currently, The fixed 512KB prealloc buffer size is too larger for
tiny memory kernel (such as 16MB memory). This patch adds the module
option "prealloc_buffer_size_kbytes" to specify prealloc buffer size.

It's suitable for cards which use the generic dmaengine pcm driver
with no config.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Link: https://lore.kernel.org/r/1632394246-59341-1-git-send-email-sugar.zhang@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sugar Zhang 2021-09-23 18:50:46 +08:00 committed by Mark Brown
parent d090004252
commit b0e3b0a707
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GPG Key ID: 24D68B725D5487D0
2 changed files with 14 additions and 1 deletions
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9
Documentation/sound/alsa-configuration.rst
View File

@ -100,6 +100,15 @@ amidi_map
MIDI device number maps assigned to the 2st OSS device;
Default: 1
Module snd-soc-core
-------------------
The soc core module. It is used by all ALSA card drivers.
It takes the following options which have global effects.
prealloc_buffer_size_kbytes
Specify prealloc buffer size in kbytes (default: 512).
Common parameters for top sound card modules
--------------------------------------------

6
sound/soc/soc-generic-dmaengine-pcm.c
View File

@ -15,6 +15,10 @@
#include <sound/dmaengine_pcm.h>
static unsigned int prealloc_buffer_size_kbytes = 512;
module_param(prealloc_buffer_size_kbytes, uint, 0444);
MODULE_PARM_DESC(prealloc_buffer_size_kbytes, "Preallocate DMA buffer size (KB).");
/*
* The platforms dmaengine driver does not support reporting the amount of
* bytes that are still left to transfer.
@ -237,7 +241,7 @@ static int dmaengine_pcm_new(struct snd_soc_component *component,
prealloc_buffer_size = config->prealloc_buffer_size;
max_buffer_size = config->pcm_hardware->buffer_bytes_max;
} else {
prealloc_buffer_size = 512 * 1024;
prealloc_buffer_size = prealloc_buffer_size_kbytes * 1024;
max_buffer_size = SIZE_MAX;
}