diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/950-0068-ASoC-wm8804-Implement-MCLK-configuration-options-add.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/950-0068-ASoC-wm8804-Implement-MCLK-configuration-options-add.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/950-0068-ASoC-wm8804-Implement-MCLK-configuration-options-add.patch b/target/linux/brcm2708/patches-4.9/950-0068-ASoC-wm8804-Implement-MCLK-configuration-options-add.patch new file mode 100644 index 0000000..1be734b --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/950-0068-ASoC-wm8804-Implement-MCLK-configuration-options-add.patch @@ -0,0 +1,49 @@ +From 8432dc7c8a843e7c35d7624adc6653e13dd488a7 Mon Sep 17 00:00:00 2001 +From: Daniel Matuschek <info@crazy-audio.com> +Date: Wed, 15 Jan 2014 21:41:23 +0100 +Subject: [PATCH] ASoC: wm8804: Implement MCLK configuration options, add 32bit + support WM8804 can run with PLL frequencies of 256xfs and 128xfs for most + sample rates. At 192kHz only 128xfs is supported. The existing driver selects + 128xfs automatically for some lower samples rates. By using an additional + mclk_div divider, it is now possible to control the behaviour. This allows + using 256xfs PLL frequency on all sample rates up to 96kHz. It should allow + lower jitter and better signal quality. The behavior has to be controlled by + the sound card driver, because some sample frequency share the same setting. + e.g. 192kHz and 96kHz use 24.576MHz master clock. The only difference is the + MCLK divider. + +This also added support for 32bit data. + +Signed-off-by: Daniel Matuschek <daniel@matuschek.net> +--- + sound/soc/codecs/wm8804.c | 5 +++-- + 1 file changed, 3 insertions(+), 2 deletions(-) + +--- a/sound/soc/codecs/wm8804.c ++++ b/sound/soc/codecs/wm8804.c +@@ -304,6 +304,7 @@ static int wm8804_hw_params(struct snd_p + blen = 0x1; + break; + case 24: ++ case 32: + blen = 0x2; + break; + default: +@@ -515,7 +516,7 @@ static const struct snd_soc_dai_ops wm88 + }; + + #define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ +- SNDRV_PCM_FMTBIT_S24_LE) ++ SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE) + + #define WM8804_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ + SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \ +@@ -543,7 +544,7 @@ static struct snd_soc_dai_driver wm8804_ + }; + + static const struct snd_soc_codec_driver soc_codec_dev_wm8804 = { +- .idle_bias_off = true, ++ .idle_bias_off = false, + + .component_driver = { + .dapm_widgets = wm8804_dapm_widgets, |