[PATCH] ASoC: tlv320adcx140: Add support for master mode
Dan Murphy
dmurphy at ti.com
Tue Sep 8 15:50:10 CEST 2020
Camel
On 9/8/20 4:18 AM, Camel Guo wrote:
> From: Camel Guo <camelg at axis.com>
>
> Add setup of bclk-to-ws ratio and sample rate when in master mode,
> as well as MCLK input pin setup.
The patches you submitted need to go on the sound/for-next branch as it
does not apply cleanly.
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
> Limitations:
>
> - MCLK is assumed to be connected to GPIO1 (other possible choices
> would be GPI0..3 if they weren't used for analog positive inputs).
> - PLL is always enabled, and clock generation is in automatic mode.
>
> Signed-off-by: Camel Guo <camelg at axis.com>
> ---
> sound/soc/codecs/tlv320adcx140.c | 134 ++++++++++++++++++++++++++++++-
> sound/soc/codecs/tlv320adcx140.h | 35 ++++++++
> 2 files changed, 165 insertions(+), 4 deletions(-)
>
> diff --git a/sound/soc/codecs/tlv320adcx140.c b/sound/soc/codecs/tlv320adcx140.c
> index 13ece039e9fe..f143b6b62f84 100644
> --- a/sound/soc/codecs/tlv320adcx140.c
> +++ b/sound/soc/codecs/tlv320adcx140.c
> @@ -35,6 +35,7 @@ struct adcx140_priv {
> unsigned int dai_fmt;
> unsigned int tdm_delay;
> unsigned int slot_width;
> + int master;
Can this be a bool instead?
> };
>
> static const char * const gpo_config_names[] = {
> @@ -614,12 +615,85 @@ static int adcx140_reset(struct adcx140_priv *adcx140)
> return ret;
> }
>
> +static int adcx140_fs_bclk_ratio(unsigned int bclk_ratio)
> +{
> + switch (bclk_ratio) {
> + case 16:
> + return ADCX140_RATIO_16;
> + case 24:
> + return ADCX140_RATIO_24;
> + case 32:
> + return ADCX140_RATIO_32;
> + case 48:
> + return ADCX140_RATIO_48;
> + case 64:
> + return ADCX140_RATIO_64;
> + case 96:
> + return ADCX140_RATIO_96;
> + case 128:
> + return ADCX140_RATIO_128;
> + case 192:
> + return ADCX140_RATIO_192;
> + case 256:
> + return ADCX140_RATIO_256;
> + case 384:
> + return ADCX140_RATIO_384;
> + case 512:
> + return ADCX140_RATIO_512;
> + case 1024:
> + return ADCX140_RATIO_1024;
> + case 2048:
> + return ADCX140_RATIO_2048;
> + default:
> + break;
> + }
> + return -EINVAL;
> +}
> +
> +static int adcx140_fs_rate(unsigned int rate)
> +{
> + switch (rate) {
> + case 7350:
> + case 8000:
> + return ADCX140_8_OR_7_35KHZ;
> + case 14700:
> + case 16000:
> + return ADCX140_16_OR_14_7KHZ;
> + case 22050:
> + case 24000:
> + return ADCX140_24_OR_22_05KHZ;
> + case 29400:
> + case 32000:
> + return ADCX140_32_OR_29_4KHZ;
> + case 44100:
> + case 48000:
> + return ADCX140_48_OR_44_1KHZ;
> + case 88200:
> + case 96000:
> + return ADCX140_96_OR_88_2KHZ;
> + case 176400:
> + case 192000:
> + return ADCX140_192_OR_176_4KHZ;
> + case 352800:
> + case 384000:
> + return ADCX140_384_OR_352_8KHZ;
> + case 705600:
> + case 768000:
> + return ADCX140_768_OR_705_6KHZ;
> + default:
> + break;
> + }
> + return -EINVAL;
> +}
> +
> static int adcx140_hw_params(struct snd_pcm_substream *substream,
> struct snd_pcm_hw_params *params,
> struct snd_soc_dai *dai)
> {
> struct snd_soc_component *component = dai->component;
> + struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
> u8 data = 0;
> + u8 mst_cfg0 = 0;
>
> switch (params_width(params)) {
> case 16:
> @@ -640,6 +714,60 @@ static int adcx140_hw_params(struct snd_pcm_substream *substream,
> return -EINVAL;
> }
>
> + if (adcx140->master) {
> + u8 mst_cfg1 = 0;
> + u8 gpio_cfg0 = 0;
> + unsigned int bclk_ratio;
> + int ret;
> +
Can this be moved into a function?
Then we can avoid variable init mid function
> + mst_cfg0 = ADCX140_MST_SLV_CFG_BIT;
> + if (params_rate(params) % 1000)
> + mst_cfg0 |= ADCX140_FS_MODE_BIT; /* 44.1 kHz et al */
> +
> + ret = adcx140_fs_rate(params_rate(params));
> + if (ret < 0) {
> + dev_err(component->dev, "%s: Unsupported rate %d\n",
> + __func__, params_rate(params));
> + return ret;
> + }
> + mst_cfg1 |= ret;
> +
> + /* In slave mode when using automatic clock configuration,
> + * the codec figures out the BCLK to FSYNC ratio itself. But
> + * here in master mode, we need to tell it.
> + */
> +
> + bclk_ratio = snd_soc_params_to_frame_size(params);
> + ret = adcx140_fs_bclk_ratio(bclk_ratio);
> + if (ret < 0) {
> + dev_err(component->dev, "%s: Unsupported bclk_ratio %d\n",
> + __func__, bclk_ratio);
> + return ret;
> + }
> + mst_cfg1 |= ret;
> +
> + /* The codec can receive MCLK on any input: GPIO, GPI0..3.
> + * While in future it would be nice to have these selectable
> + * via clk_id for instance, for now we fix GPIO1 as the MCLK
> + * source.
> + */
> + gpio_cfg0 |= ADCX140_GPIO1_MCLK;
Actually the latest driver has the GPO and GPI configurable via the DT
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/sound/tlv320adcx140.yaml?h=v5.9-rc4
Shouldn't be to difficult to add the GPIO as well please add this
instead of hard coding the GPIO.
> +
> + snd_soc_component_update_bits(component, ADCX140_MST_CFG1,
> + ADCX140_FS_RATE_MSK |
> + ADCX140_RATIO_MSK,
> + mst_cfg1);
> +
> + snd_soc_component_update_bits(component, ADCX140_GPIO_CFG0,
> + ADCX140_GPIO1_CFG_MSK,
> + gpio_cfg0);
> + }
> +
> + snd_soc_component_update_bits(component, ADCX140_MST_CFG0,
> + ADCX140_FS_MODE_BIT |
> + ADCX140_MST_SLV_CFG_BIT,
> + mst_cfg0);
> +
> snd_soc_component_update_bits(component, ADCX140_ASI_CFG0,
> ADCX140_WORD_LEN_MSK, data);
>
> @@ -652,16 +780,16 @@ static int adcx140_set_dai_fmt(struct snd_soc_dai *codec_dai,
> struct snd_soc_component *component = codec_dai->component;
> struct adcx140_priv *adcx140 = snd_soc_component_get_drvdata(component);
> u8 iface_reg1 = 0;
> - u8 iface_reg2 = 0;
> int offset = 0;
> int width = adcx140->slot_width;
>
> /* set master/slave audio interface */
> switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
> case SND_SOC_DAIFMT_CBM_CFM:
> - iface_reg2 |= ADCX140_BCLK_FSYNC_MASTER;
> + adcx140->master = 1;
> break;
> case SND_SOC_DAIFMT_CBS_CFS:
> + adcx140->master = 0;
> break;
> case SND_SOC_DAIFMT_CBS_CFM:
> case SND_SOC_DAIFMT_CBM_CFS:
> @@ -714,8 +842,6 @@ static int adcx140_set_dai_fmt(struct snd_soc_dai *codec_dai,
> ADCX140_BCLKINV_BIT |
> ADCX140_ASI_FORMAT_MSK,
> iface_reg1);
> - snd_soc_component_update_bits(component, ADCX140_MST_CFG0,
> - ADCX140_BCLK_FSYNC_MASTER, iface_reg2);
>
> /* Configure data offset */
> snd_soc_component_update_bits(component, ADCX140_ASI_CFG1,
> diff --git a/sound/soc/codecs/tlv320adcx140.h b/sound/soc/codecs/tlv320adcx140.h
> index eedbc1d7221f..bac34800b189 100644
> --- a/sound/soc/codecs/tlv320adcx140.h
> +++ b/sound/soc/codecs/tlv320adcx140.h
> @@ -145,4 +145,39 @@
> #define ADCX140_GPO_CFG_MAX 4
> #define ADCX140_GPO_DRV_MAX 5
>
> +/* MST_CFG0 */
> +#define ADCX140_MST_SLV_CFG_BIT BIT(7)
This is already defined as ADCX140_BCLK_FSYNC_MASTER please don't
define defines that are already defined.
> +#define ADCX140_FS_MODE_BIT BIT(3)
This is already defined as ADCX140_FSYNCINV_BIT
Dan
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