[alsa-devel] [PATCHv3 4/7] ASoC: TWL6030: Add support for low-power PLL
TWL6030 codec sysclk can be provided by: low-power or high performance PLL.
The low-power PLL takes a low-frequency input at 32,768 Hz and generates an approximate of 17.64 or 19.2 MHz.
The high-performance PLL generates an exact 19.2 MHz clock signal from high-frequency input at 12/19.2/26/38.4 MHz.
For the particular case of headset path, PLL being used defines the headset power mode: low-power, high-performance. Headset DAC and output driver should be configured according to the selected mode. 17.64 MHz sysclk is recommended only for headset low-power playback mode.
Signed-off-by: Misael Lopez Cruz x0052729@ti.com --- sound/soc/codecs/twl6030.c | 232 +++++++++++++++++++++++++++++++++++++------ sound/soc/codecs/twl6030.h | 16 +++ 2 files changed, 215 insertions(+), 33 deletions(-)
diff --git a/sound/soc/codecs/twl6030.c b/sound/soc/codecs/twl6030.c index f97dec2..9fc4795 100644 --- a/sound/soc/codecs/twl6030.c +++ b/sound/soc/codecs/twl6030.c @@ -39,7 +39,7 @@
#include "twl6030.h"
-#define TWL6030_RATES (SNDRV_PCM_RATE_48000) +#define TWL6030_RATES (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000) #define TWL6030_FORMATS (SNDRV_PCM_FMTBIT_S32_LE)
/* codec private data */ @@ -47,6 +47,9 @@ struct twl6030_data { struct snd_soc_codec codec; int audpwron; int codec_powered; + int pll; + unsigned int sysclk; + struct snd_pcm_hw_constraint_list *sysclk_constraints; };
/* @@ -326,6 +329,29 @@ static void twl6030_power_down(struct snd_soc_codec *codec) mdelay(10); }
+/* set headset dac and driver power mode */ +static int headset_power_mode(struct snd_soc_codec *codec, int high_perf) +{ + int hslctl, hsrctl; + int mask = TWL6030_HSDRVMODEL | TWL6030_HSDACMODEL; + + hslctl = twl6030_read_reg_cache(codec, TWL6030_REG_HSLCTL); + hsrctl = twl6030_read_reg_cache(codec, TWL6030_REG_HSRCTL); + + if (high_perf) { + hslctl &= ~mask; + hsrctl &= ~mask; + } else { + hslctl |= mask; + hsrctl |= mask; + } + + twl6030_write(codec, TWL6030_REG_HSLCTL, hslctl); + twl6030_write(codec, TWL6030_REG_HSRCTL, hsrctl); + + return 0; +} + /* * MICATT volume control: * from -6 to 0 dB in 6 dB steps @@ -607,55 +633,195 @@ static int twl6030_set_bias_level(struct snd_soc_codec *codec, return 0; }
+/* set of rates for each pll: low-power and high-performance */ + +static unsigned int lp_rates[] = { + 44100, + 48000, +}; + +static struct snd_pcm_hw_constraint_list lp_constraints = { + .count = ARRAY_SIZE(lp_rates), + .list = lp_rates, +}; + +static unsigned int hp_rates[] = { + 48000, +}; + +static struct snd_pcm_hw_constraint_list hp_constraints = { + .count = ARRAY_SIZE(hp_rates), + .list = hp_rates, +}; + +static int twl6030_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->card->codec; + struct twl6030_data *priv = codec->private_data; + + if (!priv->sysclk) { + dev_err(codec->dev, + "no mclk configured, call set_sysclk() on init\n"); + return -EINVAL; + } + + snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + priv->sysclk_constraints); + + return 0; +} + +static int twl6030_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->card->codec; + struct twl6030_data *priv = codec->private_data; + u8 lppllctl; + int rate; + + /* nothing to do for high-perf pll, it supports only 48 kHz */ + if (priv->pll == TWL6030_HPPLL_ID) + return 0; + + lppllctl = twl6030_read_reg_cache(codec, TWL6030_REG_LPPLLCTL); + + rate = params_rate(params); + switch (rate) { + case 44100: + lppllctl |= TWL6030_LPLLFIN; + priv->sysclk = 17640000; + break; + case 48000: + lppllctl &= ~TWL6030_LPLLFIN; + priv->sysclk = 19200000; + break; + default: + dev_err(codec->dev, "unsupported rate %d\n", rate); + return -EINVAL; + } + + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + + return 0; +} + static int twl6030_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, unsigned int freq, int dir) { struct snd_soc_codec *codec = codec_dai->codec; + struct twl6030_data *priv = codec->private_data; u8 hppllctl, lppllctl;
hppllctl = twl6030_read_reg_cache(codec, TWL6030_REG_HPPLLCTL); - hppllctl &= ~TWL6030_MCLK_MSK; - - switch (freq) { - case 12000000: - /* mclk input, pll enabled */ - hppllctl |= TWL6030_MCLK_12000KHZ | - TWL6030_HPLLSQRBP | - TWL6030_HPLLENA; - break; - case 19200000: - /* mclk input, pll disabled */ - hppllctl |= TWL6030_MCLK_19200KHZ | - TWL6030_HPLLSQRBP | - TWL6030_HPLLBP; - break; - case 26000000: - /* mclk input, pll enabled */ - hppllctl |= TWL6030_MCLK_26000KHZ | - TWL6030_HPLLSQRBP | - TWL6030_HPLLENA; + lppllctl = twl6030_read_reg_cache(codec, TWL6030_REG_LPPLLCTL); + + switch (clk_id) { + case TWL6030_SYSCLK_SEL_LPPLL: + switch (freq) { + case 32768: + /* headset dac and driver must be in low-power mode */ + headset_power_mode(codec, 0); + + /* clk32k input requires low-power pll */ + lppllctl |= TWL6030_LPLLENA; + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + mdelay(5); + lppllctl &= ~TWL6030_HPLLSEL; + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + hppllctl &= ~TWL6030_HPLLENA; + twl6030_write(codec, TWL6030_REG_HPPLLCTL, hppllctl); + break; + default: + dev_err(codec->dev, "unknown mclk freq %d\n", freq); + return -EINVAL; + } + + /* lppll divider */ + switch (priv->sysclk) { + case 17640000: + lppllctl |= TWL6030_LPLLFIN; + break; + case 19200000: + lppllctl &= ~TWL6030_LPLLFIN; + break; + default: + /* sysclk not yet configured */ + lppllctl &= ~TWL6030_LPLLFIN; + priv->sysclk = 19200000; + break; + } + + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + + priv->pll = TWL6030_LPPLL_ID; + priv->sysclk_constraints = &lp_constraints; break; - case 38400000: - /* clk slicer, pll disabled */ - hppllctl |= TWL6030_MCLK_38400KHZ | - TWL6030_HPLLSQRENA | - TWL6030_HPLLBP; + case TWL6030_SYSCLK_SEL_HPPLL: + hppllctl &= ~TWL6030_MCLK_MSK; + + switch (freq) { + case 12000000: + /* mclk input, pll enabled */ + hppllctl |= TWL6030_MCLK_12000KHZ | + TWL6030_HPLLSQRBP | + TWL6030_HPLLENA; + break; + case 19200000: + /* mclk input, pll disabled */ + hppllctl |= TWL6030_MCLK_19200KHZ | + TWL6030_HPLLSQRBP | + TWL6030_HPLLBP; + break; + case 26000000: + /* mclk input, pll enabled */ + hppllctl |= TWL6030_MCLK_26000KHZ | + TWL6030_HPLLSQRBP | + TWL6030_HPLLENA; + break; + case 38400000: + /* clk slicer, pll disabled */ + hppllctl |= TWL6030_MCLK_38400KHZ | + TWL6030_HPLLSQRENA | + TWL6030_HPLLBP; + break; + default: + dev_err(codec->dev, "unknown mclk freq %d\n", freq); + return -EINVAL; + } + + /* headset dac and driver must be in high-performance mode */ + headset_power_mode(codec, 1); + + twl6030_write(codec, TWL6030_REG_HPPLLCTL, hppllctl); + udelay(500); + lppllctl |= TWL6030_HPLLSEL; + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + lppllctl &= ~TWL6030_LPLLENA; + twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); + + /* high-performance pll can provide only 19.2 MHz */ + priv->pll = TWL6030_HPPLL_ID; + priv->sysclk = 19200000; + priv->sysclk_constraints = &hp_constraints; break; default: - dev_err(codec->dev, "unknown sysclk freq %d\n", freq); + dev_err(codec->dev, "unknown clk_id %d\n", clk_id); return -EINVAL; }
- twl6030_write(codec, TWL6030_REG_HPPLLCTL, hppllctl); - - /* Disable LPPLL and select HPPLL */ - lppllctl = TWL6030_HPLLSEL; - twl6030_write(codec, TWL6030_REG_LPPLLCTL, lppllctl); - return 0; }
static struct snd_soc_dai_ops twl6030_dai_ops = { + .startup = twl6030_startup, + .hw_params = twl6030_hw_params, .set_sysclk = twl6030_set_dai_sysclk, };
diff --git a/sound/soc/codecs/twl6030.h b/sound/soc/codecs/twl6030.h index 7375ae8..87f1e1e 100644 --- a/sound/soc/codecs/twl6030.h +++ b/sound/soc/codecs/twl6030.h @@ -100,10 +100,26 @@ #define TWL6030_LPLLFIN 0x08 #define TWL6030_HPLLSEL 0x10
+/* HSLCTL (0x10) fields */ + +#define TWL6030_HSDACMODEL 0x02 +#define TWL6030_HSDRVMODEL 0x08 + +/* HSRCTL (0x11) fields */ + +#define TWL6030_HSDACMODER 0x02 +#define TWL6030_HSDRVMODER 0x08 + /* ACCCTL (0x2D) fields */
#define TWL6030_RESETSPLIT 0x04
+#define TWL6030_SYSCLK_SEL_LPPLL 1 +#define TWL6030_SYSCLK_SEL_HPPLL 2 + +#define TWL6030_HPPLL_ID 1 +#define TWL6030_LPPLL_ID 2 + extern struct snd_soc_dai twl6030_dai; extern struct snd_soc_codec_device soc_codec_dev_twl6030;
participants (1)
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Lopez Cruz, Misael