lkml.org 
[lkml]   [2018]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 1/5] ALSA: soc-compress: add support to snd_compr_set_runtime_buffer()
Date
Existing compress offload code allocates data buffers using simple kmalloc,
however there are situations where these buffers have to be mapped
in smmu. So provide a way to set the runtime buffer by the driver itself,
simillar to what we do with pcm.

This patch adds support to set runtime dma buffer on compressed stream.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
include/sound/compress_driver.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h
index ea8c93bbb0e0..0cdc3999ecfa 100644
--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -23,6 +23,7 @@ struct snd_compr_ops;
* struct snd_compr_runtime: runtime stream description
* @state: stream state
* @ops: pointer to DSP callbacks
+ * @dma_buffer_p: runtime dma buffer pointer
* @buffer: pointer to kernel buffer, valid only when not in mmap mode or
* DSP doesn't implement copy
* @buffer_size: size of the above buffer
@@ -37,6 +38,7 @@ struct snd_compr_ops;
struct snd_compr_runtime {
snd_pcm_state_t state;
struct snd_compr_ops *ops;
+ struct snd_dma_buffer *dma_buffer_p;
void *buffer;
u64 buffer_size;
u32 fragment_size;
@@ -175,6 +177,23 @@ static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
wake_up(&stream->runtime->sleep);
}

+/**
+ * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
+ * @substream: compress substream to set
+ * @bufp: the buffer information, NULL to clear
+ *
+ * Copy the buffer information to runtime buffer when @bufp is non-NULL.
+ * Otherwise it clears the current buffer information.
+ */
+static inline void snd_compr_set_runtime_buffer(
+ struct snd_compr_stream *substream,
+ struct snd_dma_buffer *bufp)
+{
+ struct snd_compr_runtime *runtime = substream->runtime;
+
+ runtime->dma_buffer_p = bufp;
+}
+
int snd_compr_stop_error(struct snd_compr_stream *stream,
snd_pcm_state_t state);

--
2.19.1
\
 
 \ /
  Last update: 2018-11-15 19:16    [W:0.129 / U:21.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site