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Date: Tue, 19 Oct 2021 15:58:02 -0500
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: George Song <george.song@...imintegrated.com>, lgirdwood@...il.com,
broonie@...nel.org, robh+dt@...nel.org
Cc: devicetree@...r.kernel.org, alsa-devel@...a-project.org,
steves.lee@...imintegrated.com, ryans.lee@...imintegrated.com,
george.song@...log.com, linux-kernel@...r.kernel.org
Subject: Re: [v4] ASoC: max98520: add max98520 audio amplifier driver
> +static int max98520_dai_tdm_slot(struct snd_soc_dai *dai,
> + unsigned int tx_mask, unsigned int rx_mask,
> + int slots, int slot_width)
> +{
> + struct snd_soc_component *component = dai->component;
> + struct max98520_priv *max98520 =
> + snd_soc_component_get_drvdata(component);
> + int bsel = 0;
nit-pick: useless initialization....
> + unsigned int chan_sz = 0;
> +
> + if (!tx_mask && !rx_mask && !slots && !slot_width)
> + max98520->tdm_mode = false;
> + else
> + max98520->tdm_mode = true;
> +
> + /* BCLK configuration */
> + bsel = max98520_get_bclk_sel(slots * slot_width);
... it's overridden here.
> + if (bsel == 0) {
> + dev_err(component->dev, "BCLK %d not supported\n",
> + slots * slot_width);
> + return -EINVAL;
> + }
> +
> + regmap_update_bits(max98520->regmap,
> + MAX98520_R2041_PCM_CLK_SETUP,
> + MAX98520_PCM_CLK_SETUP_BSEL_MASK,
> + bsel);
> +
> + /* Channel size configuration */
> + switch (slot_width) {
> + case 16:
> + chan_sz = MAX98520_PCM_MODE_CFG_CHANSZ_16;
> + break;
> + case 24:
> + chan_sz = MAX98520_PCM_MODE_CFG_CHANSZ_24;
> + break;
> + case 32:
> + chan_sz = MAX98520_PCM_MODE_CFG_CHANSZ_32;
> + break;
> + default:
> + dev_err(component->dev, "format unsupported %d\n",
> + slot_width);
> + return -EINVAL;
> + }
> +
> + regmap_update_bits(max98520->regmap,
> + MAX98520_R2040_PCM_MODE_CFG,
> + MAX98520_PCM_MODE_CFG_CHANSZ_MASK, chan_sz);
> +
> + /* Rx slot configuration */
> + regmap_update_bits(max98520->regmap,
> + MAX98520_R2044_PCM_RX_SRC2,
> + MAX98520_PCM_DMIX_CH0_SRC_MASK,
> + rx_mask);
> + regmap_update_bits(max98520->regmap,
> + MAX98520_R2044_PCM_RX_SRC2,
> + MAX98520_PCM_DMIX_CH1_SRC_MASK,
> + rx_mask << MAX98520_PCM_DMIX_CH1_SHIFT);
> +
> + return 0;
> +}
> +
> +#define MAX98520_RATES SNDRV_PCM_RATE_8000_192000
> +
> +#define MAX98520_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
> + SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
> +
> +static const struct snd_soc_dai_ops max98520_dai_ops = {
> + .set_fmt = max98520_dai_set_fmt,
> + .hw_params = max98520_dai_hw_params,
> + .set_tdm_slot = max98520_dai_tdm_slot,
> +};
> +
> +static int max98520_dac_event(struct snd_soc_dapm_widget *w,
> + struct snd_kcontrol *kcontrol, int event)
> +{
> + struct snd_soc_component *component =
> + snd_soc_dapm_to_component(w->dapm);
> + struct max98520_priv *max98520 =
> + snd_soc_component_get_drvdata(component);
> +
> + switch (event) {
> + case SND_SOC_DAPM_POST_PMU:
is it intentional that you use POST_PMU here? for symmetry with POST_PMD
below, should this be PRE_PMU?
> + dev_dbg(component->dev, " AMP ON\n");
> +
> + regmap_write(max98520->regmap, MAX98520_R209F_AMP_EN, 1);
> + regmap_write(max98520->regmap, MAX98520_R210F_GLOBAL_EN, 1);
> + usleep_range(30000, 31000);
> + break;
> + case SND_SOC_DAPM_POST_PMD:
> + dev_dbg(component->dev, " AMP OFF\n");
> +
> + regmap_write(max98520->regmap, MAX98520_R210F_GLOBAL_EN, 0);
> + regmap_write(max98520->regmap, MAX98520_R209F_AMP_EN, 0);
> + usleep_range(30000, 31000);
> + break;
> + default:
> + return 0;
> + }
> + return 0;
> +}
>
> +static void max98520_reset(struct max98520_priv *max98520, struct device *dev)
> +{
> + int ret, reg, count;
> +
> + /* Software Reset */
> + ret = regmap_write(max98520->regmap, MAX98520_R2000_SW_RESET, 1);
> + if (ret)
> + dev_err(dev, "Reset command failed. (ret:%d)\n", ret);
return; ?
Trying to verify if the reset worked is the reset command failed seems
unnecessary?
> +
> + count = 0;
> + while (count < 3) {
> + usleep_range(10000, 11000);
> + /* Software Reset Verification */
> + ret = regmap_read(max98520->regmap, MAX98520_R21FF_REVISION_ID, ®);
> + if (!ret)
> + return;
> +
> + count++;
> + }
> + dev_err(dev, "Reset failed. (ret:%d)\n", ret);
> +}
> +#ifdef CONFIG_PM_SLEEP
the recommendation is to remove these ifdefs and use __maybe_unused for
pm functions.
> +static int max98520_suspend(struct device *dev)
> +{
> + struct max98520_priv *max98520 = dev_get_drvdata(dev);
> +
> + regcache_cache_only(max98520->regmap, true);
> + regcache_mark_dirty(max98520->regmap);
> + return 0;
> +}
> +
> +static int max98520_resume(struct device *dev)
> +{
> + struct max98520_priv *max98520 = dev_get_drvdata(dev);
> +
> + regcache_cache_only(max98520->regmap, false);
> + max98520_reset(max98520, dev);
> + regcache_sync(max98520->regmap);
> + return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops max98520_pm = {
> + SET_SYSTEM_SLEEP_PM_OPS(max98520_suspend, max98520_resume)
> +};
> +
> +static const struct snd_soc_component_driver soc_codec_dev_max98520 = {
> + .probe = max98520_probe,
> + .controls = max98520_snd_controls,
> + .num_controls = ARRAY_SIZE(max98520_snd_controls),
> + .dapm_widgets = max98520_dapm_widgets,
> + .num_dapm_widgets = ARRAY_SIZE(max98520_dapm_widgets),
> + .dapm_routes = max98520_audio_map,
> + .num_dapm_routes = ARRAY_SIZE(max98520_audio_map),
> + .idle_bias_on = 1,
> + .use_pmdown_time = 1,
> + .endianness = 1,
> + .non_legacy_dai_naming = 1,
> +};
> +
> +static const struct regmap_config max98520_regmap = {
> + .reg_bits = 16,
> + .val_bits = 8,
> + .max_register = MAX98520_R21FF_REVISION_ID,
> + .reg_defaults = max98520_reg,
> + .num_reg_defaults = ARRAY_SIZE(max98520_reg),
> + .readable_reg = max98520_readable_register,
> + .volatile_reg = max98520_volatile_reg,
> + .cache_type = REGCACHE_RBTREE,
> +};
> +
> +static void max98520_power_on(struct max98520_priv *max98520, bool poweron)
> +{
> + if (max98520->reset_gpio)
> + gpiod_set_value_cansleep(max98520->reset_gpio, !poweron);
> +}
> +
> +static int max98520_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
> +{
> + int ret = 0;
useless init
> + int reg = 0;
> + struct max98520_priv *max98520 = NULL;
useless init
> + struct i2c_adapter *adapter = to_i2c_adapter(i2c->dev.parent);
> +
> + ret = i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA);
> + if (!ret) {
> + dev_err(&i2c->dev, "I2C check functionality failed\n");
> + return -ENXIO;
> + }
> +
> + max98520 = devm_kzalloc(&i2c->dev, sizeof(*max98520), GFP_KERNEL);
> +
> + if (!max98520) {
> + ret = -ENOMEM;
> + return ret;
return -ENOMEM;
> + }
> + i2c_set_clientdata(i2c, max98520);
> +
> + /* regmap initialization */
> + max98520->regmap =
> + devm_regmap_init_i2c(i2c, &max98520_regmap);
one line?
> + if (IS_ERR(max98520->regmap)) {
> + ret = PTR_ERR(max98520->regmap);
> + dev_err(&i2c->dev,
> + "Failed to allocate regmap: %d\n", ret);
one line?
> + return ret;
> + }
> +
> + /* Power on device */
> + max98520->reset_gpio = devm_gpiod_get_optional(&i2c->dev, "reset", GPIOD_OUT_HIGH);
> + if (max98520->reset_gpio) {
> + if (IS_ERR(max98520->reset_gpio)) {
> + ret = PTR_ERR(max98520->reset_gpio);
> + dev_err(&i2c->dev, "Unable to request GPIO pin: %d.\n", ret);
> + return ret;
> + }
> +
> + max98520_power_on(max98520, 1);
> + }
> +
> + /* Check Revision ID */
> + ret = regmap_read(max98520->regmap, MAX98520_R21FF_REVISION_ID, ®);
> + if (ret < 0) {
> + dev_err(&i2c->dev,
> + "Failed to read: 0x%02X\n", MAX98520_R21FF_REVISION_ID);
> + return ret;
> + }
> + dev_info(&i2c->dev, "MAX98520 revisionID: 0x%02X\n", reg);
> +
> + /* codec registration */
> + ret = devm_snd_soc_register_component(&i2c->dev,
> + &soc_codec_dev_max98520,
> + max98520_dai, ARRAY_SIZE(max98520_dai));
alignment?
> + if (ret < 0)
> + dev_err(&i2c->dev, "Failed to register codec: %d\n", ret);
> +
> + return ret;
> +}
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id max98520_acpi_match[] = {
> + { "MX98520", 0 },
MX is not a valid ACPI/PNP vendor identifier but I suppose it's been
used by Maxim for all products...
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