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rpi-wm8804-soundcard: configure wm8804 clocks only on rate change

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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>
This commit is contained in:
Matthias Reichl
2018-11-18 15:32:28 +01:00
committed by popcornmix
parent 155f6366ff
commit fcbc54a8d9
1 changed files with 9 additions and 0 deletions
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9
sound/soc/bcm/rpi-wm8804-soundcard.c
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@@ -64,6 +64,7 @@ struct snd_rpi_wm8804_drvdata {
static struct gpio_desc *snd_clk44gpio; static struct gpio_desc *snd_clk44gpio;
static struct gpio_desc *snd_clk48gpio; static struct gpio_desc *snd_clk48gpio;
static int wm8804_samplerate = 0;
#define CLK_44EN_RATE 22579200UL #define CLK_44EN_RATE 22579200UL
#define CLK_48EN_RATE 24576000UL #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; struct wm8804_clk_cfg clk_cfg;
int samplerate = params_rate(params); 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); snd_rpi_wm8804_clk_cfg(samplerate, &clk_cfg);
pr_debug("%s samplerate: %d mclk_freq: %u mclk_div: %u sysclk: %u\n", 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; return ret;
} }
wm8804_samplerate = samplerate;
/* set sampling frequency status bits */ /* set sampling frequency status bits */
snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f, snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f,
sampling_freq); sampling_freq);