mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-28 09:39:00 +00:00
81 lines
2.3 KiB
Diff
81 lines
2.3 KiB
Diff
From b63482e725f4dd2c6adcda4878e5eadac238f05b Mon Sep 17 00:00:00 2001
|
|
From: Matthias Reichl <hias@horus.com>
|
|
Date: Thu, 22 Feb 2018 11:55:06 +0100
|
|
Subject: [PATCH 065/725] ASoC: pcm512x: implement set_tdm_slot interface
|
|
|
|
PCM512x can accept data padded with additional BCLK cycles
|
|
but the driver currently lacks an interface to configure this.
|
|
|
|
This leads to the problem that S24_LE format in master mode
|
|
can result in non-integer clock divisors and pcm512x running
|
|
at a rather off rate.
|
|
|
|
For example 48kHz with 48fs BCLK and SCLK at 24.576MHz uses
|
|
a divisor of 10 (rounded down from 10.6666) and results in a
|
|
51.2kHz LRCLK. With 64fs BCLK a divisor of 8 is used and
|
|
LRCLK runs at exactly 48kHz.
|
|
|
|
Fix this by providing a minimal set_tdm_slot implementation
|
|
so machine drivers can optionally configure custom BCLK ratios.
|
|
|
|
Signed-off-by: Matthias Reichl <hias@horus.com>
|
|
---
|
|
sound/soc/codecs/pcm512x.c | 28 +++++++++++++++++++++++++++-
|
|
1 file changed, 27 insertions(+), 1 deletion(-)
|
|
|
|
--- a/sound/soc/codecs/pcm512x.c
|
|
+++ b/sound/soc/codecs/pcm512x.c
|
|
@@ -53,6 +53,7 @@ struct pcm512x_priv {
|
|
unsigned long overclock_pll;
|
|
unsigned long overclock_dac;
|
|
unsigned long overclock_dsp;
|
|
+ int lrclk_div;
|
|
};
|
|
|
|
/*
|
|
@@ -851,7 +852,10 @@ static int pcm512x_set_dividers(struct s
|
|
int fssp;
|
|
int gpio;
|
|
|
|
- lrclk_div = snd_soc_params_to_frame_size(params);
|
|
+ if (pcm512x->lrclk_div)
|
|
+ lrclk_div = pcm512x->lrclk_div;
|
|
+ else
|
|
+ lrclk_div = snd_soc_params_to_frame_size(params);
|
|
if (lrclk_div == 0) {
|
|
dev_err(dev, "No LRCLK?\n");
|
|
return -EINVAL;
|
|
@@ -1319,10 +1323,32 @@ static int pcm512x_set_fmt(struct snd_so
|
|
return 0;
|
|
}
|
|
|
|
+static int pcm512x_set_tdm_slot(struct snd_soc_dai *dai,
|
|
+ unsigned int tx_mask, unsigned int rx_mask,
|
|
+ int slots, int width)
|
|
+{
|
|
+ struct snd_soc_component *component = dai->component;
|
|
+ struct pcm512x_priv *pcm512x = snd_soc_component_get_drvdata(component);
|
|
+
|
|
+ switch (slots) {
|
|
+ case 0:
|
|
+ pcm512x->lrclk_div = 0;
|
|
+ return 0;
|
|
+ case 2:
|
|
+ if (tx_mask != 0x03 || rx_mask != 0x03)
|
|
+ return -EINVAL;
|
|
+ pcm512x->lrclk_div = slots * width;
|
|
+ return 0;
|
|
+ default:
|
|
+ return -EINVAL;
|
|
+ }
|
|
+}
|
|
+
|
|
static const struct snd_soc_dai_ops pcm512x_dai_ops = {
|
|
.startup = pcm512x_dai_startup,
|
|
.hw_params = pcm512x_hw_params,
|
|
.set_fmt = pcm512x_set_fmt,
|
|
+ .set_tdm_slot = pcm512x_set_tdm_slot,
|
|
};
|
|
|
|
static struct snd_soc_dai_driver pcm512x_dai = {
|