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Diffstat (limited to 'sys-kernel/boest-v5.0.15/raspberrypi/0145-rpi-wm8804-soundcard-configure-wm8804-clocks-only-on.patch')
-rw-r--r--sys-kernel/boest-v5.0.15/raspberrypi/0145-rpi-wm8804-soundcard-configure-wm8804-clocks-only-on.patch48
1 files changed, 48 insertions, 0 deletions
diff --git a/sys-kernel/boest-v5.0.15/raspberrypi/0145-rpi-wm8804-soundcard-configure-wm8804-clocks-only-on.patch b/sys-kernel/boest-v5.0.15/raspberrypi/0145-rpi-wm8804-soundcard-configure-wm8804-clocks-only-on.patch
new file mode 100644
index 00000000..219e92d7
--- /dev/null
+++ b/sys-kernel/boest-v5.0.15/raspberrypi/0145-rpi-wm8804-soundcard-configure-wm8804-clocks-only-on.patch
@@ -0,0 +1,48 @@
+From 52650ace84711fde1fab593089a337f209478ef1 Mon Sep 17 00:00:00 2001
+From: Matthias Reichl <hias@horus.com>
+Date: Sun, 18 Nov 2018 15:32:28 +0100
+Subject: [PATCH 145/194] 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(+)
+
+diff --git a/sound/soc/bcm/rpi-wm8804-soundcard.c b/sound/soc/bcm/rpi-wm8804-soundcard.c
+index ad42f5d35067..c1bed91e2cda 100644
+--- 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(struct snd_pcm_substream *substream,
+ 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(struct snd_pcm_substream *substream,
+ return ret;
+ }
+
++ wm8804_samplerate = samplerate;
++
+ /* set sampling frequency status bits */
+ snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f,
+ sampling_freq);