ASoC: meson: aiu: add support for the Meson8 and Meson8b SoC families

The AIU audio controller on the Meson8 and Meson8b SoC families is
compatible with the one found in the later GXBB family. Add compatible
strings for these two older SoC families so the driver can be loaded for
them.

Instead of using the I2S divider from the AIU_CLK_CTRL_MORE register we
need to use the I2S divider from the AIU_CLK_CTRL register. This older
register is less flexible because it only supports four divider settings
(1, 2, 4, 8) compared to the AIU_CLK_CTRL_MORE register (which supports
dividers in the range 0..64).

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20200220205711.77953-4-martin.blumenstingl@googlemail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index 897a706dcda01e1c390d5e632a057ae6f2642e9e..d27e9180b45377788cdea77cb6e93691126a1a3f 100644 (file)
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -10,7 +10,7 @@ config SND_MESON_AIU
        imply SND_SOC_HDMI_CODEC if DRM_MESON_DW_HDMI
        help
          Select Y or M to add support for the Audio output subsystem found
-         in the Amlogic GX SoC family
+         in the Amlogic Meson8, Meson8b and GX SoC families
 
 config SND_MESON_AXG_FIFO
        tristate

diff --git a/sound/soc/meson/aiu-encoder-i2s.c b/sound/soc/meson/aiu-encoder-i2s.c
index 4900e38e7e494e69fb98117d31125a107694fd73..cc73b5d5c2b704c45efee025c8665188037f4009 100644 (file)
--- a/sound/soc/meson/aiu-encoder-i2s.c
+++ b/sound/soc/meson/aiu-encoder-i2s.c
@@ -111,34 +111,40 @@ static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component,
        return 0;
 }
 
-static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
-                                     struct snd_pcm_hw_params *params)
+static int aiu_encoder_i2s_set_legacy_div(struct snd_soc_component *component,
+                                         struct snd_pcm_hw_params *params,
+                                         unsigned int bs)
 {
-       struct aiu *aiu = snd_soc_component_get_drvdata(component);
-       unsigned int srate = params_rate(params);
-       unsigned int fs, bs;
-
-       /* Get the oversampling factor */
-       fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
+       switch (bs) {
+       case 1:
+       case 2:
+       case 4:
+       case 8:
+               /* These are the only valid legacy dividers */
+               break;
 
-       if (fs % 64)
+       default:
+               dev_err(component->dev, "Unsupported i2s divider: %u\n", bs);
                return -EINVAL;
+       };
 
-       /* Send data MSB first */
-       snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
-                                     AIU_I2S_DAC_CFG_MSB_FIRST,
-                                     AIU_I2S_DAC_CFG_MSB_FIRST);
+       snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+                                     AIU_CLK_CTRL_I2S_DIV,
+                                     FIELD_PREP(AIU_CLK_CTRL_I2S_DIV,
+                                                __ffs(bs)));
 
-       /* Set bclk to lrlck ratio */
-       snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
-                                     AIU_CODEC_DAC_LRCLK_CTRL_DIV,
-                                     FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
-                                                64 - 1));
+       snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
+                                     AIU_CLK_CTRL_MORE_I2S_DIV,
+                                     FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
+                                                0));
 
-       /* Use CLK_MORE for mclk to bclk divider */
-       snd_soc_component_update_bits(component, AIU_CLK_CTRL,
-                                     AIU_CLK_CTRL_I2S_DIV, 0);
+       return 0;
+}
 
+static int aiu_encoder_i2s_set_more_div(struct snd_soc_component *component,
+                                       struct snd_pcm_hw_params *params,
+                                       unsigned int bs)
+{
        /*
         * NOTE: this HW is odd.
         * In most configuration, the i2s divider is 'mclk / blck'.
@@ -146,7 +152,6 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
         * increased by 50% to get the correct output rate.
         * No idea why !
         */
-       bs = fs / 64;
        if (params_width(params) == 16 && params_channels(params) == 8) {
                if (bs % 2) {
                        dev_err(component->dev,
@@ -156,11 +161,54 @@ static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
                bs += bs / 2;
        }
 
+       /* Use CLK_MORE for mclk to bclk divider */
+       snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+                                     AIU_CLK_CTRL_I2S_DIV,
+                                     FIELD_PREP(AIU_CLK_CTRL_I2S_DIV, 0));
+
        snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
                                      AIU_CLK_CTRL_MORE_I2S_DIV,
                                      FIELD_PREP(AIU_CLK_CTRL_MORE_I2S_DIV,
                                                 bs - 1));
 
+       return 0;
+}
+
+static int aiu_encoder_i2s_set_clocks(struct snd_soc_component *component,
+                                     struct snd_pcm_hw_params *params)
+{
+       struct aiu *aiu = snd_soc_component_get_drvdata(component);
+       unsigned int srate = params_rate(params);
+       unsigned int fs, bs;
+       int ret;
+
+       /* Get the oversampling factor */
+       fs = DIV_ROUND_CLOSEST(clk_get_rate(aiu->i2s.clks[MCLK].clk), srate);
+
+       if (fs % 64)
+               return -EINVAL;
+
+       /* Send data MSB first */
+       snd_soc_component_update_bits(component, AIU_I2S_DAC_CFG,
+                                     AIU_I2S_DAC_CFG_MSB_FIRST,
+                                     AIU_I2S_DAC_CFG_MSB_FIRST);
+
+       /* Set bclk to lrlck ratio */
+       snd_soc_component_update_bits(component, AIU_CODEC_DAC_LRCLK_CTRL,
+                                     AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+                                     FIELD_PREP(AIU_CODEC_DAC_LRCLK_CTRL_DIV,
+                                                64 - 1));
+
+       bs = fs / 64;
+
+       if (aiu->platform->has_clk_ctrl_more_i2s_div)
+               ret = aiu_encoder_i2s_set_more_div(component, params, bs);
+       else
+               ret = aiu_encoder_i2s_set_legacy_div(component, params, bs);
+
+       if (ret)
+               return ret;
+
        /* Make sure amclk is used for HDMI i2s as well */
        snd_soc_component_update_bits(component, AIU_CLK_CTRL_MORE,
                                      AIU_CLK_CTRL_MORE_HDMI_AMCLK,

diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c
index 38209312a8c31afad780c9d9d466b4800fe74236..dc35ca79021c5760a388e66b60e5e81419580d4f 100644 (file)
--- a/sound/soc/meson/aiu.c
+++ b/sound/soc/meson/aiu.c
@@ -351,15 +351,24 @@ static int aiu_remove(struct platform_device *pdev)
 
 static const struct aiu_platform_data aiu_gxbb_pdata = {
        .has_acodec = false,
+       .has_clk_ctrl_more_i2s_div = true,
 };
 
 static const struct aiu_platform_data aiu_gxl_pdata = {
        .has_acodec = true,
+       .has_clk_ctrl_more_i2s_div = true,
+};
+
+static const struct aiu_platform_data aiu_meson8_pdata = {
+       .has_acodec = false,
+       .has_clk_ctrl_more_i2s_div = false,
 };
 
 static const struct of_device_id aiu_of_match[] = {
        { .compatible = "amlogic,aiu-gxbb", .data = &aiu_gxbb_pdata },
        { .compatible = "amlogic,aiu-gxl", .data = &aiu_gxl_pdata },
+       { .compatible = "amlogic,aiu-meson8", .data = &aiu_meson8_pdata },
+       { .compatible = "amlogic,aiu-meson8b", .data = &aiu_meson8_pdata },
        {}
 };
 MODULE_DEVICE_TABLE(of, aiu_of_match);

diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h
index ab003638d5e593f7d1f77bc7a0026de68afe8e94..87aa19ac4af3aff0267519db2ba86d4245db9455 100644 (file)
--- a/sound/soc/meson/aiu.h
+++ b/sound/soc/meson/aiu.h
@@ -29,6 +29,7 @@ struct aiu_interface {
 
 struct aiu_platform_data {
        bool has_acodec;
+       bool has_clk_ctrl_more_i2s_div;
 };
 
 struct aiu {