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Unverified Commit 624e8e00 authored by Sugar Zhang's avatar Sugar Zhang Committed by Mark Brown
Browse files

ASoC: rockchip: pdm: fixup pdm fractional div



This patch adds support fractional div for rk3308.

Signed-off-by: default avatarSugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 072cb68a
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+130 −42
Original line number Diff line number Diff line
@@ -17,14 +17,23 @@
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pm_runtime.h>
#include <linux/rational.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "rockchip_pdm.h"

#define PDM_DMA_BURST_SIZE	(8) /* size * width: 8*4 = 32 bytes */
#define PDM_SIGNOFF_CLK_RATE	(100000000)

enum rk_pdm_version {
	RK_PDM_RK3229,
	RK_PDM_RK3308,
};

struct rk_pdm_dev {
	struct device *dev;
@@ -32,22 +41,51 @@ struct rk_pdm_dev {
	struct clk *hclk;
	struct regmap *regmap;
	struct snd_dmaengine_dai_dma_data capture_dma_data;
	struct reset_control *reset;
	enum rk_pdm_version version;
};

struct rk_pdm_clkref {
	unsigned int sr;
	unsigned int clk;
	unsigned int clk_out;
};

struct rk_pdm_ds_ratio {
	unsigned int ratio;
	unsigned int sr;
};

static struct rk_pdm_clkref clkref[] = {
	{ 8000, 40960000 },
	{ 11025, 56448000 },
	{ 12000, 61440000 },
	{ 8000, 40960000, 2048000 },
	{ 11025, 56448000, 2822400 },
	{ 12000, 61440000, 3072000 },
	{ 8000, 98304000, 2048000 },
	{ 12000, 98304000, 3072000 },
};

static struct rk_pdm_ds_ratio ds_ratio[] = {
	{ 0, 192000 },
	{ 0, 176400 },
	{ 0, 128000 },
	{ 1, 96000 },
	{ 1, 88200 },
	{ 1, 64000 },
	{ 2, 48000 },
	{ 2, 44100 },
	{ 2, 32000 },
	{ 3, 24000 },
	{ 3, 22050 },
	{ 3, 16000 },
	{ 4, 12000 },
	{ 4, 11025 },
	{ 4, 8000 },
};

static unsigned int get_pdm_clk(unsigned int sr)
static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
				unsigned int *clk_src, unsigned int *clk_out)
{
	unsigned int i, count, clk, div;
	unsigned int i, count, clk, div, rate;

	clk = 0;
	if (!sr)
@@ -59,14 +97,39 @@ static unsigned int get_pdm_clk(unsigned int sr)
			continue;
		div = sr / clkref[i].sr;
		if ((div & (div - 1)) == 0) {
			*clk_out = clkref[i].clk_out;
			rate = clk_round_rate(pdm->clk, clkref[i].clk);
			if (rate != clkref[i].clk)
				continue;
			clk = clkref[i].clk;
			*clk_src = clkref[i].clk;
			break;
		}
	}

	if (!clk) {
		clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
		*clk_src = clk;
	}
	return clk;
}

static unsigned int get_pdm_ds_ratio(unsigned int sr)
{
	unsigned int i, count, ratio;

	ratio = 0;
	if (!sr)
		return ratio;

	count = ARRAY_SIZE(ds_ratio);
	for (i = 0; i < count; i++) {
		if (sr == ds_ratio[i].sr)
			ratio = ds_ratio[i].ratio;
	}
	return ratio;
}

static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
{
	return snd_soc_dai_get_drvdata(dai);
@@ -95,40 +158,52 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
	struct rk_pdm_dev *pdm = to_info(dai);
	unsigned int val = 0;
	unsigned int clk_rate, clk_div, samplerate;
	unsigned int clk_src, clk_out;
	unsigned long m, n;
	bool change;
	int ret;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return 0;

	samplerate = params_rate(params);
	clk_rate = get_pdm_clk(samplerate);
	clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
	if (!clk_rate)
		return -EINVAL;

	ret = clk_set_rate(pdm->clk, clk_rate);
	ret = clk_set_rate(pdm->clk, clk_src);
	if (ret)
		return -EINVAL;

	clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);

	switch (clk_div) {
	case 320:
		val = PDM_CLK_320FS;
		break;
	case 640:
		val = PDM_CLK_640FS;
		break;
	case 1280:
		val = PDM_CLK_1280FS;
		break;
	case 2560:
		val = PDM_CLK_2560FS;
		break;
	case 5120:
		val = PDM_CLK_5120FS;
		break;
	default:
		dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
	if (pdm->version == RK_PDM_RK3308) {
		rational_best_approximation(clk_out, clk_src,
					    GENMASK(16 - 1, 0),
					    GENMASK(16 - 1, 0),
					    &m, &n);

		val = (m << PDM_FD_NUMERATOR_SFT) |
			(n << PDM_FD_DENOMINATOR_SFT);
		regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
					 PDM_FD_NUMERATOR_MSK |
					 PDM_FD_DENOMINATOR_MSK,
					 val, &change);
		if (change) {
			reset_control_assert(pdm->reset);
			reset_control_deassert(pdm->reset);
			rockchip_pdm_rxctrl(pdm, 0);
		}
		clk_div = n / m;
		if (clk_div >= 40)
			val = PDM_CLK_FD_RATIO_40;
		else if (clk_div <= 35)
			val = PDM_CLK_FD_RATIO_35;
		else
			return -EINVAL;
		regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
				   PDM_CLK_FD_RATIO_MSK,
				   val);
	}

	val = get_pdm_ds_ratio(samplerate);
	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
			   PDM_HPF_CF_MSK, PDM_HPF_60HZ);
@@ -177,13 +252,11 @@ static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
		return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	regmap_update_bits(pdm->regmap, PDM_CTRL0,
			   PDM_PATH_MSK | PDM_VDW_MSK,
			   val);
	regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
			   PDM_DMA_RDL(16));
	}

	return 0;
}
@@ -380,8 +453,19 @@ static const struct regmap_config rockchip_pdm_regmap_config = {
	.cache_type = REGCACHE_FLAT,
};

static const struct of_device_id rockchip_pdm_match[] = {
	{ .compatible = "rockchip,pdm", },
	{ .compatible = "rockchip,px30-pdm",
	  .data = (void *)RK_PDM_RK3308 },
	{ .compatible = "rockchip,rk3308-pdm",
	  .data = (void *)RK_PDM_RK3308 },
	{},
};
MODULE_DEVICE_TABLE(of, rockchip_pdm_match);

static int rockchip_pdm_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	struct rk_pdm_dev *pdm;
	struct resource *res;
	void __iomem *regs;
@@ -391,6 +475,16 @@ static int rockchip_pdm_probe(struct platform_device *pdev)
	if (!pdm)
		return -ENOMEM;

	match = of_match_device(rockchip_pdm_match, &pdev->dev);
	if (match)
		pdm->version = (enum rk_pdm_version)match->data;

	if (pdm->version == RK_PDM_RK3308) {
		pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
		if (IS_ERR(pdm->reset))
			return PTR_ERR(pdm->reset);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs))
@@ -503,12 +597,6 @@ static const struct dev_pm_ops rockchip_pdm_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
};

static const struct of_device_id rockchip_pdm_match[] = {
	{ .compatible = "rockchip,pdm", },
	{},
};
MODULE_DEVICE_TABLE(of, rockchip_pdm_match);

static struct platform_driver rockchip_pdm_driver = {
	.probe  = rockchip_pdm_probe,
	.remove = rockchip_pdm_remove,
+9 −0
Original line number Diff line number Diff line
@@ -53,7 +53,16 @@
#define PDM_VDW_MSK		(0x1f << 0)
#define PDM_VDW(X)		((X - 1) << 0)

/* PDM CTRL1 */
#define PDM_FD_NUMERATOR_SFT	16
#define PDM_FD_NUMERATOR_MSK	GENMASK(31, 16)
#define PDM_FD_DENOMINATOR_SFT	0
#define PDM_FD_DENOMINATOR_MSK	GENMASK(15, 0)

/* PDM CLK CTRL */
#define PDM_CLK_FD_RATIO_MSK	BIT(6)
#define PDM_CLK_FD_RATIO_40	(0X0 << 6)
#define PDM_CLK_FD_RATIO_35	BIT(6)
#define PDM_CLK_MSK		BIT(5)
#define PDM_CLK_EN		BIT(5)
#define PDM_CLK_DIS		(0x0 << 5)