mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 06:57:57 +00:00
47 lines
1.4 KiB
Diff
47 lines
1.4 KiB
Diff
From f6b133a056e8fde7f4707e2874e204c7d5d671a2 Mon Sep 17 00:00:00 2001
|
|
From: Matthias Reichl <hias@horus.com>
|
|
Date: Sun, 18 Nov 2018 15:32:28 +0100
|
|
Subject: [PATCH 212/806] rpi-wm8804-soundcard: configure wm8804 clocks only on
|
|
rate change
|
|
|
|
This should avoid clicks when stopping and immediately afterwards
|
|
starting a stream with the same samplerate as before.
|
|
|
|
Signed-off-by: Matthias Reichl <hias@horus.com>
|
|
---
|
|
sound/soc/bcm/rpi-wm8804-soundcard.c | 9 +++++++++
|
|
1 file changed, 9 insertions(+)
|
|
|
|
--- a/sound/soc/bcm/rpi-wm8804-soundcard.c
|
|
+++ b/sound/soc/bcm/rpi-wm8804-soundcard.c
|
|
@@ -64,6 +64,7 @@ struct snd_rpi_wm8804_drvdata {
|
|
|
|
static struct gpio_desc *snd_clk44gpio;
|
|
static struct gpio_desc *snd_clk48gpio;
|
|
+static int wm8804_samplerate = 0;
|
|
|
|
#define CLK_44EN_RATE 22579200UL
|
|
#define CLK_48EN_RATE 24576000UL
|
|
@@ -117,6 +118,12 @@ static int snd_rpi_wm8804_hw_params(stru
|
|
struct wm8804_clk_cfg clk_cfg;
|
|
int samplerate = params_rate(params);
|
|
|
|
+ if (samplerate == wm8804_samplerate)
|
|
+ return 0;
|
|
+
|
|
+ /* clear until all clocks are setup properly */
|
|
+ wm8804_samplerate = 0;
|
|
+
|
|
snd_rpi_wm8804_clk_cfg(samplerate, &clk_cfg);
|
|
|
|
pr_debug("%s samplerate: %d mclk_freq: %u mclk_div: %u sysclk: %u\n",
|
|
@@ -163,6 +170,8 @@ static int snd_rpi_wm8804_hw_params(stru
|
|
return ret;
|
|
}
|
|
|
|
+ wm8804_samplerate = samplerate;
|
|
+
|
|
/* set sampling frequency status bits */
|
|
snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f,
|
|
sampling_freq);
|