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Commit d29e0a6e authored by Daniel Mack's avatar Daniel Mack Committed by Mark Brown
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ASoC: max98396: Fix TDM mode BSEL settings 

In TDM mode, the BSEL register value must be set according to table 5 in the
datasheet. This patch adds a lookup function and uses it in
max98396_dai_tdm_slot().

As the first 3 entries can also be used for non-TDM setups, the code re-uses
the same table for such scenarios.
Signed-off-by: default avatarDaniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20220629050630.2848317-1-daniel@zonque.orgSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent 48620f17
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Showing with 96 additions and 44 deletions
sound/soc/codecs/max98396.c
View file @ d29e0a6e
......@@ -438,47 +438,68 @@ static int max98396_dai_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
return 0;
}
/* BCLKs per LRCLK */
static const int bclk_sel_table[] = {
32, 48, 64, 96, 128, 192, 256, 384, 512, 320,
#define MAX98396_BSEL_32 0x2
#define MAX98396_BSEL_48 0x3
#define MAX98396_BSEL_64 0x4
#define MAX98396_BSEL_96 0x5
#define MAX98396_BSEL_128 0x6
#define MAX98396_BSEL_192 0x7
#define MAX98396_BSEL_256 0x8
#define MAX98396_BSEL_384 0x9
#define MAX98396_BSEL_512 0xa
#define MAX98396_BSEL_320 0xb
#define MAX98396_BSEL_250 0xc
#define MAX98396_BSEL_125 0xd
/* Refer to table 5 in the datasheet */
static const struct max98396_pcm_config {
int in, out, width, bsel, max_sr;
} max98396_pcm_configs[] = {
{ .in = 2, .out = 4, .width = 16, .bsel = MAX98396_BSEL_32, .max_sr = 192000 },
{ .in = 2, .out = 6, .width = 24, .bsel = MAX98396_BSEL_48, .max_sr = 192000 },
{ .in = 2, .out = 8, .width = 32, .bsel = MAX98396_BSEL_64, .max_sr = 192000 },
{ .in = 3, .out = 15, .width = 32, .bsel = MAX98396_BSEL_125, .max_sr = 192000 },
{ .in = 4, .out = 8, .width = 16, .bsel = MAX98396_BSEL_64, .max_sr = 192000 },
{ .in = 4, .out = 12, .width = 24, .bsel = MAX98396_BSEL_96, .max_sr = 192000 },
{ .in = 4, .out = 16, .width = 32, .bsel = MAX98396_BSEL_128, .max_sr = 192000 },
{ .in = 5, .out = 15, .width = 24, .bsel = MAX98396_BSEL_125, .max_sr = 192000 },
{ .in = 7, .out = 15, .width = 16, .bsel = MAX98396_BSEL_125, .max_sr = 192000 },
{ .in = 2, .out = 4, .width = 16, .bsel = MAX98396_BSEL_32, .max_sr = 96000 },
{ .in = 2, .out = 6, .width = 24, .bsel = MAX98396_BSEL_48, .max_sr = 96000 },
{ .in = 2, .out = 8, .width = 32, .bsel = MAX98396_BSEL_64, .max_sr = 96000 },
{ .in = 3, .out = 15, .width = 32, .bsel = MAX98396_BSEL_125, .max_sr = 96000 },
{ .in = 4, .out = 8, .width = 16, .bsel = MAX98396_BSEL_64, .max_sr = 96000 },
{ .in = 4, .out = 12, .width = 24, .bsel = MAX98396_BSEL_96, .max_sr = 96000 },
{ .in = 4, .out = 16, .width = 32, .bsel = MAX98396_BSEL_128, .max_sr = 96000 },
{ .in = 5, .out = 15, .width = 24, .bsel = MAX98396_BSEL_125, .max_sr = 96000 },
{ .in = 7, .out = 15, .width = 16, .bsel = MAX98396_BSEL_125, .max_sr = 96000 },
{ .in = 7, .out = 31, .width = 32, .bsel = MAX98396_BSEL_250, .max_sr = 96000 },
{ .in = 8, .out = 16, .width = 16, .bsel = MAX98396_BSEL_128, .max_sr = 96000 },
{ .in = 8, .out = 24, .width = 24, .bsel = MAX98396_BSEL_192, .max_sr = 96000 },
{ .in = 8, .out = 32, .width = 32, .bsel = MAX98396_BSEL_256, .max_sr = 96000 },
{ .in = 10, .out = 31, .width = 24, .bsel = MAX98396_BSEL_250, .max_sr = 96000 },
{ .in = 15, .out = 31, .width = 16, .bsel = MAX98396_BSEL_250, .max_sr = 96000 },
{ .in = 16, .out = 32, .width = 16, .bsel = MAX98396_BSEL_256, .max_sr = 96000 },
{ .in = 7, .out = 31, .width = 32, .bsel = MAX98396_BSEL_250, .max_sr = 48000 },
{ .in = 10, .out = 31, .width = 24, .bsel = MAX98396_BSEL_250, .max_sr = 48000 },
{ .in = 10, .out = 40, .width = 32, .bsel = MAX98396_BSEL_320, .max_sr = 48000 },
{ .in = 15, .out = 31, .width = 16, .bsel = MAX98396_BSEL_250, .max_sr = 48000 },
{ .in = 16, .out = 48, .width = 24, .bsel = MAX98396_BSEL_384, .max_sr = 48000 },
{ .in = 16, .out = 64, .width = 32, .bsel = MAX98396_BSEL_512, .max_sr = 48000 },
};
static int max98396_get_bclk_sel(int bclk)
static int max98396_pcm_config_index(int in_slots, int out_slots, int width)
{
int i;
/* match BCLKs per LRCLK */
for (i = 0; i < ARRAY_SIZE(bclk_sel_table); i++) {
if (bclk_sel_table[i] == bclk)
return i + 2;
}
return 0;
}
static int max98396_set_clock(struct snd_soc_component *component,
struct snd_pcm_hw_params *params)
{
struct max98396_priv *max98396 = snd_soc_component_get_drvdata(component);
/* BCLK/LRCLK ratio calculation */
int blr_clk_ratio = params_channels(params) * max98396->ch_size;
int value;
if (!max98396->tdm_mode) {
/* BCLK configuration */
value = max98396_get_bclk_sel(blr_clk_ratio);
if (!value) {
dev_err(component->dev,
"blr_clk_ratio %d unsupported, format %d\n",
blr_clk_ratio, params_format(params));
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(max98396_pcm_configs); i++) {
const struct max98396_pcm_config *c = &max98396_pcm_configs[i];
regmap_update_bits(max98396->regmap,
MAX98396_R2042_PCM_CLK_SETUP,
MAX98396_PCM_CLK_SETUP_BSEL_MASK,
value);
if (in_slots == c->in && out_slots <= c->out && width == c->width)
return i;
}
return 0;
return -1;
}
static int max98396_dai_hw_params(struct snd_pcm_substream *substream,
......@@ -489,8 +510,7 @@ static int max98396_dai_hw_params(struct snd_pcm_substream *substream,
struct max98396_priv *max98396 = snd_soc_component_get_drvdata(component);
unsigned int sampling_rate = 0;
unsigned int chan_sz = 0;
int ret, reg;
int status;
int ret, reg, status, bsel = 0;
bool update = false;
/* pcm mode configuration */
......@@ -510,8 +530,6 @@ static int max98396_dai_hw_params(struct snd_pcm_substream *substream,
goto err;
}
max98396->ch_size = snd_pcm_format_width(params_format(params));
dev_dbg(component->dev, "format supported %d",
params_format(params));
......@@ -559,6 +577,33 @@ static int max98396_dai_hw_params(struct snd_pcm_substream *substream,
goto err;
}
if (max98396->tdm_mode) {
if (params_rate(params) > max98396->tdm_max_samplerate) {
dev_err(component->dev, "TDM sample rate %d too high",
params_rate(params));
goto err;
}
} else {
/* BCLK configuration */
ret = max98396_pcm_config_index(params_channels(params),
params_channels(params),
snd_pcm_format_width(params_format(params)));
if (ret < 0) {
dev_err(component->dev,
"no PCM config for %d channels, format %d\n",
params_channels(params), params_format(params));
goto err;
}
bsel = max98396_pcm_configs[ret].bsel;
if (params_rate(params) > max98396_pcm_configs[ret].max_sr) {
dev_err(component->dev, "sample rate %d too high",
params_rate(params));
goto err;
}
}
ret = regmap_read(max98396->regmap, MAX98396_R210F_GLOBAL_EN, &status);
if (ret < 0)
goto err;
......@@ -604,12 +649,16 @@ static int max98396_dai_hw_params(struct snd_pcm_substream *substream,
MAX98396_IVADC_SR_MASK,
sampling_rate << MAX98396_IVADC_SR_SHIFT);
ret = max98396_set_clock(component, params);
if (bsel)
regmap_update_bits(max98396->regmap,
MAX98396_R2042_PCM_CLK_SETUP,
MAX98396_PCM_CLK_SETUP_BSEL_MASK,
bsel);
if (status && update)
max98396_global_enable_onoff(max98396->regmap, true);
return ret;
return 0;
err:
return -EINVAL;
......@@ -634,13 +683,16 @@ static int max98396_dai_tdm_slot(struct snd_soc_dai *dai,
max98396->tdm_mode = true;
/* BCLK configuration */
bsel = max98396_get_bclk_sel(slots * slot_width);
if (bsel == 0) {
dev_err(component->dev, "BCLK %d not supported\n",
slots * slot_width);
ret = max98396_pcm_config_index(slots, slots, slot_width);
if (ret < 0) {
dev_err(component->dev, "no TDM config for %d slots %d bits\n",
slots, slot_width);
return -EINVAL;
}
bsel = max98396_pcm_configs[ret].bsel;
max98396->tdm_max_samplerate = max98396_pcm_configs[ret].max_sr;
/* Channel size configuration */
switch (slot_width) {
case 16:
......
sound/soc/codecs/max98396.h
View file @ d29e0a6e
......@@ -306,8 +306,8 @@ struct max98396_priv {
unsigned int spkfb_slot;
unsigned int bypass_slot;
bool interleave_mode;
unsigned int ch_size;
bool tdm_mode;
int tdm_max_samplerate;
int device_id;
};
#endif
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