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Message-ID: <20180313082007.bwqanceskmm2dq6f@flea>
Date: Tue, 13 Mar 2018 09:20:07 +0100
From: Maxime Ripard <maxime.ripard@...tlin.com>
To: codekipper@...il.com
Cc: wens@...e.org, linux-sunxi@...glegroups.com,
linux-arm-kernel@...ts.infradead.org, lgirdwood@...il.com,
broonie@...nel.org, linux-kernel@...r.kernel.org,
alsa-devel@...a-project.org, be17068@...rbole.bo.it
Subject: Re: [PATCH v2 3/6] ASoC: sun4i-i2s: Correct divider calculations
On Mon, Mar 12, 2018 at 04:57:50PM +0100, codekipper@...il.com wrote:
> From: Marcus Cooper <codekipper@...il.com>
>
> The clock division circuitry is different on the H3 and later SoCs.
> The division of bclk is now based on pll2.
You're doing too many things here.
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> ---
> sound/soc/sunxi/sun4i-i2s.c | 76 +++++++++++++++++++++++++++++++--------------
> 1 file changed, 52 insertions(+), 24 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 396b11346361..2bd0befa02a8 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -129,10 +129,10 @@
> * @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.
> * @fmt_offset: Value by which wss and sr needs to be adjusted.
> * @field_clkdiv_mclk_en: regmap field to enable mclk output.
> + * @field_clkdiv_mclk: regmap field for mclkdiv.
> + * @field_clkdiv_bclk: regmap field for bclkdiv.
> * @field_fmt_wss: regmap field to set word select size.
> * @field_fmt_sr: regmap field to set sample resolution.
> * @field_fmt_bclk: regmap field to set clk polarity.
> @@ -153,8 +153,6 @@ 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;
> unsigned int fmt_offset;
>
> /* Register fields for i2s */
> @@ -212,7 +210,25 @@ 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 +240,21 @@ 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 +263,17 @@ 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 +338,37 @@ 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));
For example, you mention nowhere why here you would need clk_rate /
rate, instead of the previous oversample_rate.
> + 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));
While here it's ok to use oversample_rate.
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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