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Subject[PATCH 13/25] ASoC: sun8i-codec: Round up the LRCK divisor
Date
The codec supports only power-of-two BCLK/LRCK divisors. If either the
slot width or the number of slots is not a power of two, the LRCK
divisor must be rounded up to provide enough space. To do that, use
order_base_2 (instead of ilog2, which rounds down).

Since the rounded divisor is also needed for setting the SYSCLK/BCLK
divisor, return the order base 2 instead of fully calculating the
hardware register encoding.

Signed-off-by: Samuel Holland <samuel@sholland.org>
---
sound/soc/sunxi/sun8i-codec.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/sound/soc/sunxi/sun8i-codec.c b/sound/soc/sunxi/sun8i-codec.c
index e7f01a4b4001..779853d023fe 100644
--- a/sound/soc/sunxi/sun8i-codec.c
+++ b/sound/soc/sunxi/sun8i-codec.c
@@ -300,33 +300,35 @@ static u8 sun8i_codec_get_bclk_div(struct sun8i_codec *scodec,
best_diff = diff;
best_val = bdiv->val;
}
}

return best_val;
}

-static int sun8i_codec_get_lrck_div(unsigned int channels,
- unsigned int word_size)
+static int sun8i_codec_get_lrck_div_order(unsigned int slots,
+ unsigned int slot_width)
{
- unsigned int div = word_size * channels;
+ unsigned int div = slots * slot_width;

if (div < 16 || div > 256)
return -EINVAL;

- return ilog2(div) - 4;
+ return order_base_2(div);
}

static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct sun8i_codec *scodec = snd_soc_dai_get_drvdata(dai);
- int lrck_div, sample_rate, word_size;
+ unsigned int slots = params_channels(params);
+ unsigned int slot_width = params_width(params);
+ int lrck_div_order, sample_rate, word_size;
u8 bclk_div;

/* word size */
switch (params_width(params)) {
case 8:
word_size = 0x0;
break;
case 16:
@@ -346,24 +348,24 @@ static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ_MASK,
word_size << SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ);

bclk_div = sun8i_codec_get_bclk_div(scodec, params_rate(params), 16);
regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV_MASK,
bclk_div << SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV);

- lrck_div = sun8i_codec_get_lrck_div(params_channels(params),
- params_physical_width(params));
- if (lrck_div < 0)
- return lrck_div;
+ /* LRCK divider (BCLK/LRCK ratio) */
+ lrck_div_order = sun8i_codec_get_lrck_div_order(slots, slot_width);
+ if (lrck_div_order < 0)
+ return lrck_div_order;

regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
SUN8I_AIF1CLK_CTRL_AIF1_LRCK_DIV_MASK,
- lrck_div << SUN8I_AIF1CLK_CTRL_AIF1_LRCK_DIV);
+ (lrck_div_order - 4) << SUN8I_AIF1CLK_CTRL_AIF1_LRCK_DIV);

sample_rate = sun8i_codec_get_hw_rate(params);
if (sample_rate < 0)
return sample_rate;

regmap_update_bits(scodec->regmap, SUN8I_SYS_SR_CTRL,
SUN8I_SYS_SR_CTRL_AIF1_FS_MASK,
sample_rate << SUN8I_SYS_SR_CTRL_AIF1_FS);
--
2.26.2
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