lkml.org 
[lkml]   [2019]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 03/15] ASoC: sun4i-i2s: Correct divider calculations
Date
From: Marcus Cooper <codekipper@gmail.com>

The clock division circuitry is different on the H3 and later SoCs.
The division of bclk is now based on pll2.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
---
sound/soc/sunxi/sun4i-i2s.c | 73 +++++++++++++++++++++++++------------
1 file changed, 49 insertions(+), 24 deletions(-)

diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
index 7c37b6291df0..34f31439ae7b 100644
--- a/sound/soc/sunxi/sun4i-i2s.c
+++ b/sound/soc/sunxi/sun4i-i2s.c
@@ -127,8 +127,6 @@ struct sun4i_i2s;
* @has_chsel_offset: SoC uses offset for selecting dai operational mode.
* @reg_offset_txdata: offset of the tx fifo.
* @sun4i_i2s_regmap: regmap config to use.
- * @mclk_offset: Value by which mclkdiv needs to be adjusted.
- * @bclk_offset: Value by which bclkdiv needs to be adjusted.
* @field_clkdiv_mclk_en: regmap field to enable mclk output.
* @field_fmt_wss: regmap field to set word select size.
* @field_fmt_sr: regmap field to set sample resolution.
@@ -150,8 +148,6 @@ struct sun4i_i2s_quirks {
bool has_chsel_offset;
unsigned int reg_offset_txdata; /* TX FIFO */
const struct regmap_config *sun4i_i2s_regmap;
- unsigned int mclk_offset;
- unsigned int bclk_offset;

/* Register fields for i2s */
struct reg_field field_clkdiv_mclk_en;
@@ -212,7 +208,25 @@ static const struct sun4i_i2s_clk_div sun4i_i2s_bclk_div[] = {
{ .div = 8, .val = 3 },
{ .div = 12, .val = 4 },
{ .div = 16, .val = 5 },
- /* TODO - extend divide ratio supported by newer SoCs */
+};
+
+static const struct sun4i_i2s_clk_div sun8i_i2s_clk_div[] = {
+ { .div = 0, .val = 0 },
+ { .div = 1, .val = 1 },
+ { .div = 2, .val = 2 },
+ { .div = 4, .val = 3 },
+ { .div = 6, .val = 4 },
+ { .div = 8, .val = 5 },
+ { .div = 12, .val = 6 },
+ { .div = 16, .val = 7 },
+ { .div = 24, .val = 8 },
+ { .div = 32, .val = 9 },
+ { .div = 48, .val = 10 },
+ { .div = 64, .val = 11 },
+ { .div = 96, .val = 12 },
+ { .div = 128, .val = 13 },
+ { .div = 176, .val = 14 },
+ { .div = 192, .val = 15 },
};

static const struct sun4i_i2s_clk_div sun4i_i2s_mclk_div[] = {
@@ -224,21 +238,21 @@ static const struct sun4i_i2s_clk_div sun4i_i2s_mclk_div[] = {
{ .div = 12, .val = 5 },
{ .div = 16, .val = 6 },
{ .div = 24, .val = 7 },
- /* TODO - extend divide ratio supported by newer SoCs */
};

static int sun4i_i2s_get_bclk_div(struct sun4i_i2s *i2s,
unsigned int oversample_rate,
- unsigned int word_size)
+ unsigned int word_size,
+ const struct sun4i_i2s_clk_div *bdiv,
+ unsigned int size)
{
int div = oversample_rate / word_size / 2;
int i;

- for (i = 0; i < ARRAY_SIZE(sun4i_i2s_bclk_div); i++) {
- const struct sun4i_i2s_clk_div *bdiv = &sun4i_i2s_bclk_div[i];
-
+ for (i = 0; i < size; i++) {
if (bdiv->div == div)
return bdiv->val;
+ bdiv++;
}

return -EINVAL;
@@ -247,16 +261,17 @@ static int sun4i_i2s_get_bclk_div(struct sun4i_i2s *i2s,
static int sun4i_i2s_get_mclk_div(struct sun4i_i2s *i2s,
unsigned int oversample_rate,
unsigned int module_rate,
- unsigned int sampling_rate)
+ unsigned int sampling_rate,
+ const struct sun4i_i2s_clk_div *mdiv,
+ unsigned int size)
{
int div = module_rate / sampling_rate / oversample_rate;
int i;

- for (i = 0; i < ARRAY_SIZE(sun4i_i2s_mclk_div); i++) {
- const struct sun4i_i2s_clk_div *mdiv = &sun4i_i2s_mclk_div[i];
-
+ for (i = 0; i < size; i++) {
if (mdiv->div == div)
return mdiv->val;
+ mdiv++;
}

return -EINVAL;
@@ -321,24 +336,36 @@ static int sun4i_i2s_set_clk_rate(struct snd_soc_dai *dai,
return -EINVAL;
}

- bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate,
- word_size);
+ if (i2s->variant->has_fmt_set_lrck_period)
+ bclk_div = sun4i_i2s_get_bclk_div(i2s, clk_rate / rate,
+ word_size,
+ sun8i_i2s_clk_div,
+ ARRAY_SIZE(sun8i_i2s_clk_div));
+ else
+ bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate,
+ word_size,
+ sun4i_i2s_bclk_div,
+ ARRAY_SIZE(sun4i_i2s_bclk_div));
if (bclk_div < 0) {
dev_err(dai->dev, "Unsupported BCLK divider: %d\n", bclk_div);
return -EINVAL;
}

- mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
- clk_rate, rate);
+ if (i2s->variant->has_fmt_set_lrck_period)
+ mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
+ clk_rate, rate,
+ sun8i_i2s_clk_div,
+ ARRAY_SIZE(sun8i_i2s_clk_div));
+ else
+ mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
+ clk_rate, rate,
+ sun4i_i2s_mclk_div,
+ ARRAY_SIZE(sun4i_i2s_mclk_div));
if (mclk_div < 0) {
dev_err(dai->dev, "Unsupported MCLK divider: %d\n", mclk_div);
return -EINVAL;
}

- /* Adjust the clock division values if needed */
- bclk_div += i2s->variant->bclk_offset;
- mclk_div += i2s->variant->mclk_offset;
-
regmap_write(i2s->regmap, SUN4I_I2S_CLK_DIV_REG,
SUN4I_I2S_CLK_DIV_BCLK(bclk_div) |
SUN4I_I2S_CLK_DIV_MCLK(mclk_div));
@@ -994,8 +1021,6 @@ static const struct sun4i_i2s_quirks sun8i_h3_i2s_quirks = {
.has_reset = true,
.reg_offset_txdata = SUN8I_I2S_FIFO_TX_REG,
.sun4i_i2s_regmap = &sun8i_i2s_regmap_config,
- .mclk_offset = 1,
- .bclk_offset = 2,
.has_fmt_set_lrck_period = true,
.has_chcfg = true,
.has_chsel_tx_chen = true,
--
2.22.0
\
 
 \ /
  Last update: 2019-08-14 08:09    [W:0.122 / U:11.928 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site