mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
538a1d740c
The patches were generated from the RPi repo with the following command: git format-patch v6.6.58..rpi-6.6.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
From a382d82b99a078f2ce65e78df9ba6db0d01c8ca3 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Tue, 24 Sep 2024 20:34:54 +0100
|
|
Subject: [PATCH 1285/1350] ASoC: bcm2835-i2s: Set the PERIOD_BYTES min to 256
|
|
|
|
Commit [1] set the minimum PERIOD_BYTES value to the product of the DMA
|
|
burst size and 8. For the I2S interface on BCM2835 that equates to 16
|
|
where it used to be 256. ffmpeg uses the minimum value as its preferred
|
|
value, leading to many, many very small periods, which affects
|
|
performance and leads to complaints about DTS timestamps.
|
|
|
|
Restore the previous behaviour and performance by making the bcm2835-i2s
|
|
driver set a minimum PERIOD_BYTES value of 256.
|
|
|
|
Link: https://github.com/raspberrypi/linux/issues/5709
|
|
|
|
[1] 300689fb04b3 ("ASoC: soc-generic-dmaengine-pcm: set
|
|
period_bytes_min based on maxburst")
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
|
---
|
|
sound/soc/bcm/bcm2835-i2s.c | 8 ++++++++
|
|
1 file changed, 8 insertions(+)
|
|
|
|
--- a/sound/soc/bcm/bcm2835-i2s.c
|
|
+++ b/sound/soc/bcm/bcm2835-i2s.c
|
|
@@ -619,6 +619,10 @@ static int bcm2835_i2s_prepare(struct sn
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
uint32_t cs_reg;
|
|
|
|
+ snd_pcm_hw_constraint_minmax(substream->runtime,
|
|
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 256,
|
|
+ ~0);
|
|
+
|
|
/*
|
|
* Clear both FIFOs if the one that should be started
|
|
* is not empty at the moment. This should only happen
|
|
@@ -700,6 +704,10 @@ static int bcm2835_i2s_startup(struct sn
|
|
/* Should this still be running stop it */
|
|
bcm2835_i2s_stop_clock(dev);
|
|
|
|
+ snd_pcm_hw_constraint_minmax(substream->runtime,
|
|
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
|
|
+ 256, ~0);
|
|
+
|
|
/* Enable PCM block */
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
|
|
BCM2835_I2S_EN, BCM2835_I2S_EN);
|