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Date: Thu, 07 Jul 2022 15:13:22 +0100
From: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To: Paul Cercueil <paul@...pouillou.net>
Cc: lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
tiwai@...e.com, linux-mips@...r.kernel.org,
alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] ASoC: jz4740-i2s: Simplify using regmap fields
Paul Cercueil <paul@...pouillou.net> writes:
> Le mer., juil. 6 2022 at 22:13:23 +0100, Aidan MacDonald
> <aidanmacdonald.0x0@...il.com> a écrit :
>> The differences between register fields on different SoC versions
>> can be abstracted away using the regmap field API. This is easier
>> to understand and extend than comparisons based on the version ID.
>> Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
>> ---
>> sound/soc/jz4740/jz4740-i2s.c | 100 ++++++++++++++++++++++++----------
>> 1 file changed, 72 insertions(+), 28 deletions(-)
>> diff --git a/sound/soc/jz4740/jz4740-i2s.c b/sound/soc/jz4740/jz4740-i2s.c
>> index 66a901f56392..cbb89f724f64 100644
>> --- a/sound/soc/jz4740/jz4740-i2s.c
>> +++ b/sound/soc/jz4740/jz4740-i2s.c
>> @@ -91,12 +91,22 @@ enum jz47xx_i2s_version {
>> struct i2s_soc_info {
>> enum jz47xx_i2s_version version;
>> struct snd_soc_dai_driver *dai;
>> +
>> + struct reg_field field_rx_fifo_thresh;
>> + struct reg_field field_tx_fifo_thresh;
>> + struct reg_field field_i2sdiv_capture;
>> + struct reg_field field_i2sdiv_playback;
>> };
>> struct jz4740_i2s {
>> struct resource *mem;
>> struct regmap *regmap;
>> + struct regmap_field *field_rx_fifo_thresh;
>> + struct regmap_field *field_tx_fifo_thresh;
>> + struct regmap_field *field_i2sdiv_capture;
>> + struct regmap_field *field_i2sdiv_playback;
>> +
>> struct clk *clk_aic;
>> struct clk *clk_i2s;
>> @@ -222,12 +232,12 @@ static int jz4740_i2s_hw_params(struct
>> snd_pcm_substream *substream,
>> struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
>> {
>> struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>> + struct regmap_field *div_field;
>> unsigned int sample_size;
>> - uint32_t ctrl, div_reg;
>> + uint32_t ctrl;
>> int div;
>> regmap_read(i2s->regmap, JZ_REG_AIC_CTRL, &ctrl);
>> - regmap_read(i2s->regmap, JZ_REG_AIC_CLK_DIV, &div_reg);
>> div = clk_get_rate(i2s->clk_i2s) / (64 * params_rate(params));
>> @@ -250,23 +260,16 @@ static int jz4740_i2s_hw_params(struct
>> snd_pcm_substream *substream,
>> else
>> ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;
>> - div_reg &= ~I2SDIV_DV_MASK;
>> - div_reg |= (div - 1) << I2SDIV_DV_SHIFT;
>> + div_field = i2s->field_i2sdiv_playback;
>> } else {
>> ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
>> ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;
>> - if (i2s->soc_info->version >= JZ_I2S_JZ4770) {
>> - div_reg &= ~I2SDIV_IDV_MASK;
>> - div_reg |= (div - 1) << I2SDIV_IDV_SHIFT;
>> - } else {
>> - div_reg &= ~I2SDIV_DV_MASK;
>> - div_reg |= (div - 1) << I2SDIV_DV_SHIFT;
>> - }
>> + div_field = i2s->field_i2sdiv_capture;
>> }
>> regmap_write(i2s->regmap, JZ_REG_AIC_CTRL, ctrl);
>> - regmap_write(i2s->regmap, JZ_REG_AIC_CLK_DIV, div_reg);
>> + regmap_field_write(div_field, div - 1);
>> return 0;
>> }
>> @@ -342,7 +345,6 @@ static int jz4740_i2s_resume(struct snd_soc_component
>> *component)
>> static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
>> {
>> struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>> - uint32_t conf;
>> int ret;
>> ret = clk_prepare_enable(i2s->clk_aic);
>> @@ -352,22 +354,14 @@ static int jz4740_i2s_dai_probe(struct snd_soc_dai
>> *dai)
>> snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
>> &i2s->capture_dma_data);
>> - if (i2s->soc_info->version >= JZ_I2S_JZ4760) {
>> - conf = (7 << JZ4760_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
>> - (8 << JZ4760_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
>> - JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
>> - JZ_AIC_CONF_I2S |
>> - JZ_AIC_CONF_INTERNAL_CODEC;
>> - } else {
>> - conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
>> - (8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
>
> I believe you can remove these macros completely now that they are unused. Same
> goes for I2S_IDV_MASK, etc.
>
> Cheers,
> -Paul
>
Alright, I'll squash the macro and version ID removals into this patch.
>> - JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
>> - JZ_AIC_CONF_I2S |
>> - JZ_AIC_CONF_INTERNAL_CODEC;
>> - }
>> -
>> regmap_write(i2s->regmap, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
>> - regmap_write(i2s->regmap, JZ_REG_AIC_CONF, conf);
>> +
>> + regmap_write(i2s->regmap, JZ_REG_AIC_CONF,
>> + JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
>> + JZ_AIC_CONF_I2S | JZ_AIC_CONF_INTERNAL_CODEC);
>> +
>> + regmap_field_write(i2s->field_rx_fifo_thresh, 7);
>> + regmap_field_write(i2s->field_tx_fifo_thresh, 8);
>> return 0;
>> }
>> @@ -414,11 +408,19 @@ static struct snd_soc_dai_driver jz4740_i2s_dai = {
>> static const struct i2s_soc_info jz4740_i2s_soc_info = {
>> .version = JZ_I2S_JZ4740,
>> .dai = &jz4740_i2s_dai,
>> + .field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 12, 15),
>> + .field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 8, 11),
>> + .field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> + .field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> };
>> static const struct i2s_soc_info jz4760_i2s_soc_info = {
>> .version = JZ_I2S_JZ4760,
>> .dai = &jz4740_i2s_dai,
>> + .field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
>> + .field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>> + .field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> + .field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> };
>> static struct snd_soc_dai_driver jz4770_i2s_dai = {
>> @@ -442,11 +444,19 @@ static struct snd_soc_dai_driver jz4770_i2s_dai = {
>> static const struct i2s_soc_info jz4770_i2s_soc_info = {
>> .version = JZ_I2S_JZ4770,
>> .dai = &jz4770_i2s_dai,
>> + .field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
>> + .field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>> + .field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
>> + .field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> };
>> static const struct i2s_soc_info jz4780_i2s_soc_info = {
>> .version = JZ_I2S_JZ4780,
>> .dai = &jz4770_i2s_dai,
>> + .field_rx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 24, 27),
>> + .field_tx_fifo_thresh = REG_FIELD(JZ_REG_AIC_CONF, 16, 20),
>> + .field_i2sdiv_capture = REG_FIELD(JZ_REG_AIC_CLK_DIV, 8, 11),
>> + .field_i2sdiv_playback = REG_FIELD(JZ_REG_AIC_CLK_DIV, 0, 3),
>> };
>> static const struct snd_soc_component_driver jz4740_i2s_component = {
>> @@ -465,6 +475,36 @@ static const struct of_device_id jz4740_of_matches[] = {
>> };
>> MODULE_DEVICE_TABLE(of, jz4740_of_matches);
>> +static int jz4740_i2s_init_regmap_fields(struct device *dev,
>> + struct jz4740_i2s *i2s)
>> +{
>> + i2s->field_rx_fifo_thresh =
>> + devm_regmap_field_alloc(dev, i2s->regmap,
>> + i2s->soc_info->field_rx_fifo_thresh);
>> + if (IS_ERR(i2s->field_rx_fifo_thresh))
>> + return PTR_ERR(i2s->field_rx_fifo_thresh);
>> +
>> + i2s->field_tx_fifo_thresh =
>> + devm_regmap_field_alloc(dev, i2s->regmap,
>> + i2s->soc_info->field_tx_fifo_thresh);
>> + if (IS_ERR(i2s->field_tx_fifo_thresh))
>> + return PTR_ERR(i2s->field_tx_fifo_thresh);
>> +
>> + i2s->field_i2sdiv_capture =
>> + devm_regmap_field_alloc(dev, i2s->regmap,
>> + i2s->soc_info->field_i2sdiv_capture);
>> + if (IS_ERR(i2s->field_i2sdiv_capture))
>> + return PTR_ERR(i2s->field_i2sdiv_capture);
>> +
>> + i2s->field_i2sdiv_playback =
>> + devm_regmap_field_alloc(dev, i2s->regmap,
>> + i2s->soc_info->field_i2sdiv_playback);
>> + if (IS_ERR(i2s->field_i2sdiv_playback))
>> + return PTR_ERR(i2s->field_i2sdiv_playback);
>> +
>> + return 0;
>> +}
>> +
>> static const struct regmap_config jz4740_i2s_regmap_config = {
>> .reg_bits = 32,
>> .reg_stride = 4,
>> @@ -509,6 +549,10 @@ static int jz4740_i2s_dev_probe(struct platform_device
>> *pdev)
>> if (IS_ERR(i2s->regmap))
>> return PTR_ERR(i2s->regmap);
>> + ret = jz4740_i2s_init_regmap_fields(dev, i2s);
>> + if (ret)
>> + return ret;
>> +
>> platform_set_drvdata(pdev, i2s);
>> ret = devm_snd_soc_register_component(dev, &jz4740_i2s_component,
>> --
>> 2.35.1
>>
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