korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-15 06:55:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

ASoC: soc-generic-dmaengine-pcm: set period_bytes_min based on maxburst

Browse Source 
In dmaengine_pcm_set_runtime_hwparams() period_bytes_min is hardcoded to
256. For some applications that may be too big. This patch changes that
to calculate the value based on dma_data->maxburst. The correct value
would be maxburst multiplied by the address width of the hardware FIFO.
Unfortunately the address width is dynamically calculated based on the
stream parameters and is not known at open time, so the worst case
is chosen here which is 8 bytes, the maximum that is supported by
dmaengine drivers.
Not all drivers may set a maxburst value, so we fall back to the
previously used hardcoded value of 256 bytes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20220301113446.1053171-1-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sascha Hauer 2022-03-01 12:34:46 +01:00 committed by Mark Brown
parent 45ea97d743
commit 300689fb04
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
sound/soc/soc-generic-dmaengine-pcm.c
View File

@ -132,7 +132,9 @@ dmaengine_pcm_set_runtime_hwparams(struct snd_soc_component *component,
SNDRV_PCM_INFO_INTERLEAVED;
hw.periods_min = 2;
hw.periods_max = UINT_MAX;
hw.period_bytes_min = 256;
hw.period_bytes_min = dma_data->maxburst * DMA_SLAVE_BUSWIDTH_8_BYTES;
if (!hw.period_bytes_min)
hw.period_bytes_min = 256;
hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
hw.buffer_bytes_max = SIZE_MAX;
hw.fifo_size = dma_data->fifo_size;