2019-09-19 14:43:19 +00:00
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From f6b133a056e8fde7f4707e2874e204c7d5d671a2 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Matthias Reichl <hias@horus.com>
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Date: Sun, 18 Nov 2018 15:32:28 +0100
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] rpi-wm8804-soundcard: configure wm8804 clocks only on
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2019-07-09 18:32:28 +00:00
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rate change
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This should avoid clicks when stopping and immediately afterwards
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starting a stream with the same samplerate as before.
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Signed-off-by: Matthias Reichl <hias@horus.com>
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---
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sound/soc/bcm/rpi-wm8804-soundcard.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/sound/soc/bcm/rpi-wm8804-soundcard.c
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+++ b/sound/soc/bcm/rpi-wm8804-soundcard.c
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@@ -64,6 +64,7 @@ struct snd_rpi_wm8804_drvdata {
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static struct gpio_desc *snd_clk44gpio;
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static struct gpio_desc *snd_clk48gpio;
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+static int wm8804_samplerate = 0;
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#define CLK_44EN_RATE 22579200UL
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#define CLK_48EN_RATE 24576000UL
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@@ -117,6 +118,12 @@ static int snd_rpi_wm8804_hw_params(stru
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struct wm8804_clk_cfg clk_cfg;
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int samplerate = params_rate(params);
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+ if (samplerate == wm8804_samplerate)
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+ return 0;
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+
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+ /* clear until all clocks are setup properly */
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+ wm8804_samplerate = 0;
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+
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snd_rpi_wm8804_clk_cfg(samplerate, &clk_cfg);
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pr_debug("%s samplerate: %d mclk_freq: %u mclk_div: %u sysclk: %u\n",
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@@ -163,6 +170,8 @@ static int snd_rpi_wm8804_hw_params(stru
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return ret;
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}
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+ wm8804_samplerate = samplerate;
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+
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/* set sampling frequency status bits */
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snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f,
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sampling_freq);
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