ASoC: rockchip: pdm: fixup pdm fractional div

This patch adds support fractional div for rk3308.

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index c50494b..4f93a74 100644 (file)
--- a/sound/soc/rockchip/rockchip_pdm.c
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -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);
-               return -EINVAL;
+       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));
-       }
+       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,

diff --git a/sound/soc/rockchip/rockchip_pdm.h b/sound/soc/rockchip/rockchip_pdm.h
index 00a8fa1..ae88644 100644 (file)
--- a/sound/soc/rockchip/rockchip_pdm.h
+++ b/sound/soc/rockchip/rockchip_pdm.h
@@ -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)