drm: exynos: Add driver for HDMI audio interface

The hdmi-codec interface added in this patch is required to properly
support HDMI audio. Currently the audio part of the SoC internal
HDMI transmitter is configured with fixed values, which makes HDMI
audio working by chance, only on boards having an external audio
codec connected in parallel with the HDMI audio transmitter's input
I2S interface.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

3 files changed, 194 insertions, 65 deletions

diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 305dc3d4ff77..5a7c9d8abd6b 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -3,6 +3,7 @@ config DRM_EXYNOS
         depends on OF && DRM && (ARCH_S3C64XX || ARCH_EXYNOS || ARCH_MULTIPLATFORM)
         select DRM_KMS_HELPER
         select VIDEOMODE_HELPERS
+        select SND_SOC_HDMI_CODEC if SND_SOC
         help
           Choose this option if you have a Samsung SoC EXYNOS chipset.
           If M is selected the module will be called exynosdrm.
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 1309b1c9e074..82d1b7e2febe 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -40,7 +40,7 @@
 #include <linux/component.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
-
+#include <sound/hdmi-codec.h>
 #include <drm/exynos_drm.h>
 
 #include <media/cec-notifier.h>
@@ -111,12 +111,18 @@ struct hdmi_driver_data {
         struct string_array_spec clk_muxes;
 };
 
+struct hdmi_audio {
+        struct platform_device          *pdev;
+        struct hdmi_audio_infoframe     infoframe;
+        struct hdmi_codec_params        params;
+        bool                            mute;
+};
+
 struct hdmi_context {
         struct drm_encoder              encoder;
         struct device                   *dev;
         struct drm_device               *drm_dev;
         struct drm_connector            connector;
-        bool                            powered;
         bool                            dvi_mode;
         struct delayed_work             hotplug_work;
         struct cec_notifier             *notifier;
@@ -136,6 +142,11 @@ struct hdmi_context {
         struct regulator                *reg_hdmi_en;
         struct exynos_drm_clk           phy_clk;
         struct drm_bridge               *bridge;
+
+        /* mutex protecting subsequent fields below */
+        struct mutex                    mutex;
+        struct hdmi_audio               audio;
+        bool                            powered;
 };
 
 static inline struct hdmi_context *encoder_to_hdmi(struct drm_encoder *e)
@@ -776,6 +787,22 @@ static int hdmi_clk_set_parents(struct hdmi_context *hdata, bool to_phy)
         return ret;
 }
 
+static int hdmi_audio_infoframe_apply(struct hdmi_context *hdata)
+{
+        struct hdmi_audio_infoframe *infoframe = &hdata->audio.infoframe;
+        u8 buf[HDMI_INFOFRAME_SIZE(AUDIO)];
+        int len;
+
+        len = hdmi_audio_infoframe_pack(infoframe, buf, sizeof(buf));
+        if (len < 0)
+                return len;
+
+        hdmi_reg_writeb(hdata, HDMI_AUI_CON, HDMI_AUI_CON_EVERY_VSYNC);
+        hdmi_reg_write_buf(hdata, HDMI_AUI_HEADER0, buf, len);
+
+        return 0;
+}
+
 static void hdmi_reg_infoframes(struct hdmi_context *hdata)
 {
         struct drm_display_mode *m = &hdata->encoder.crtc->state->mode;
@@ -812,15 +839,7 @@ static void hdmi_reg_infoframes(struct hdmi_context *hdata)
                 hdmi_reg_write_buf(hdata, HDMI_VSI_DATA(0), buf + 3, ret - 3);
         }
 
-        ret = hdmi_audio_infoframe_init(&frm.audio);
-        if (!ret) {
-                frm.audio.channels = 2;
-                ret = hdmi_audio_infoframe_pack(&frm.audio, buf, sizeof(buf));
-        }
-        if (ret > 0) {
-                hdmi_reg_writeb(hdata, HDMI_AUI_CON, HDMI_AUI_CON_EVERY_VSYNC);
-                hdmi_reg_write_buf(hdata, HDMI_AUI_HEADER0, buf, ret);
-        }
+        hdmi_audio_infoframe_apply(hdata);
 }
 
 static enum drm_connector_status hdmi_detect(struct drm_connector *connector,
@@ -1010,23 +1029,18 @@ static void hdmi_reg_acr(struct hdmi_context *hdata, u32 freq)
         hdmi_reg_writeb(hdata, HDMI_ACR_CON, 4);
 }
 
-static void hdmi_audio_init(struct hdmi_context *hdata)
+static void hdmi_audio_config(struct hdmi_context *hdata)
 {
-        u32 sample_rate, bits_per_sample;
-        u32 data_num, bit_ch, sample_frq;
-        u32 val;
-
-        sample_rate = 44100;
-        bits_per_sample = 16;
+        u32 bit_ch = 1;
+        u32 data_num, val;
+        int i;
 
-        switch (bits_per_sample) {
+        switch (hdata->audio.params.sample_width) {
         case 20:
                 data_num = 2;
-                bit_ch = 1;
                 break;
         case 24:
                 data_num = 3;
-                bit_ch = 1;
                 break;
         default:
                 data_num = 1;
@@ -1034,7 +1048,7 @@ static void hdmi_audio_init(struct hdmi_context *hdata)
                 break;
         }
 
-        hdmi_reg_acr(hdata, sample_rate);
+        hdmi_reg_acr(hdata, hdata->audio.params.sample_rate);
 
         hdmi_reg_writeb(hdata, HDMI_I2S_MUX_CON, HDMI_I2S_IN_DISABLE
                                 | HDMI_I2S_AUD_I2S | HDMI_I2S_CUV_I2S_ENABLE
@@ -1044,12 +1058,6 @@ static void hdmi_audio_init(struct hdmi_context *hdata)
                         | HDMI_I2S_CH1_EN | HDMI_I2S_CH2_EN);
 
         hdmi_reg_writeb(hdata, HDMI_I2S_MUX_CUV, HDMI_I2S_CUV_RL_EN);
-
-        sample_frq = (sample_rate == 44100) ? 0 :
-                        (sample_rate == 48000) ? 2 :
-                        (sample_rate == 32000) ? 3 :
-                        (sample_rate == 96000) ? 0xa : 0x0;
-
         hdmi_reg_writeb(hdata, HDMI_I2S_CLK_CON, HDMI_I2S_CLK_DIS);
         hdmi_reg_writeb(hdata, HDMI_I2S_CLK_CON, HDMI_I2S_CLK_EN);
 
@@ -1073,31 +1081,24 @@ static void hdmi_audio_init(struct hdmi_context *hdata)
                         | HDMI_I2S_SET_SDATA_BIT(data_num)
                         | HDMI_I2S_BASIC_FORMAT);
 
-        /* Configure register related to CUV information */
-        hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_0, HDMI_I2S_CH_STATUS_MODE_0
-                        | HDMI_I2S_2AUD_CH_WITHOUT_PREEMPH
-                        | HDMI_I2S_COPYRIGHT
-                        | HDMI_I2S_LINEAR_PCM
-                        | HDMI_I2S_CONSUMER_FORMAT);
-        hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_1, HDMI_I2S_CD_PLAYER);
-        hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_2, HDMI_I2S_SET_SOURCE_NUM(0));
-        hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_3, HDMI_I2S_CLK_ACCUR_LEVEL_2
-                        | HDMI_I2S_SET_SMP_FREQ(sample_frq));
-        hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_4,
-                        HDMI_I2S_ORG_SMP_FREQ_44_1
-                        | HDMI_I2S_WORD_LEN_MAX24_24BITS
-                        | HDMI_I2S_WORD_LEN_MAX_24BITS);
+        /* Configuration of the audio channel status registers */
+        for (i = 0; i < HDMI_I2S_CH_ST_MAXNUM; i++)
+                hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST(i),
+                                hdata->audio.params.iec.status[i]);
 
         hdmi_reg_writeb(hdata, HDMI_I2S_CH_ST_CON, HDMI_I2S_CH_STATUS_RELOAD);
 }
 
-static void hdmi_audio_control(struct hdmi_context *hdata, bool onoff)
+static void hdmi_audio_control(struct hdmi_context *hdata)
 {
+        bool enable = !hdata->audio.mute;
+
         if (hdata->dvi_mode)
                 return;
 
-        hdmi_reg_writeb(hdata, HDMI_AUI_CON, onoff ? 2 : 0);
-        hdmi_reg_writemask(hdata, HDMI_CON_0, onoff ?
+        hdmi_reg_writeb(hdata, HDMI_AUI_CON, enable ?
+                        HDMI_AVI_CON_EVERY_VSYNC : HDMI_AUI_CON_NO_TRAN);
+        hdmi_reg_writemask(hdata, HDMI_CON_0, enable ?
                         HDMI_ASP_EN : HDMI_ASP_DIS, HDMI_ASP_MASK);
 }
 
@@ -1428,13 +1429,14 @@ static void hdmiphy_conf_apply(struct hdmi_context *hdata)
         hdmiphy_wait_for_pll(hdata);
 }
 
+/* Should be called with hdata->mutex mutex held */
 static void hdmi_conf_apply(struct hdmi_context *hdata)
 {
         hdmi_start(hdata, false);
         hdmi_conf_init(hdata);
-        hdmi_audio_init(hdata);
+        hdmi_audio_config(hdata);
         hdmi_mode_apply(hdata);
-        hdmi_audio_control(hdata, true);
+        hdmi_audio_control(hdata);
 }
 
 static void hdmi_set_refclk(struct hdmi_context *hdata, bool on)
@@ -1446,6 +1448,7 @@ static void hdmi_set_refclk(struct hdmi_context *hdata, bool on)
                            SYSREG_HDMI_REFCLK_INT_CLK, on ? ~0 : 0);
 }
 
+/* Should be called with hdata->mutex mutex held. */
 static void hdmiphy_enable(struct hdmi_context *hdata)
 {
         if (hdata->powered)
@@ -1468,6 +1471,7 @@ static void hdmiphy_enable(struct hdmi_context *hdata)
         hdata->powered = true;
 }
 
+/* Should be called with hdata->mutex mutex held. */
 static void hdmiphy_disable(struct hdmi_context *hdata)
 {
         if (!hdata->powered)
@@ -1493,28 +1497,38 @@ static void hdmi_enable(struct drm_encoder *encoder)
 {
         struct hdmi_context *hdata = encoder_to_hdmi(encoder);
 
+        mutex_lock(&hdata->mutex);
+
         hdmiphy_enable(hdata);
         hdmi_conf_apply(hdata);
+
+        mutex_unlock(&hdata->mutex);
 }
 
 static void hdmi_disable(struct drm_encoder *encoder)
 {
         struct hdmi_context *hdata = encoder_to_hdmi(encoder);
 
-        if (!hdata->powered)
+        mutex_lock(&hdata->mutex);
+
+        if (hdata->powered) {
+                /*
+                 * The SFRs of VP and Mixer are updated by Vertical Sync of
+                 * Timing generator which is a part of HDMI so the sequence
+                 * to disable TV Subsystem should be as following,
+                 *      VP -> Mixer -> HDMI
+                 *
+                 * To achieve such sequence HDMI is disabled together with
+                 * HDMI PHY, via pipe clock callback.
+                 */
+                mutex_unlock(&hdata->mutex);
+                cancel_delayed_work(&hdata->hotplug_work);
+                cec_notifier_set_phys_addr(hdata->notifier,
+                                           CEC_PHYS_ADDR_INVALID);
                 return;
+        }
 
-        /*
-         * The SFRs of VP and Mixer are updated by Vertical Sync of
-         * Timing generator which is a part of HDMI so the sequence
-         * to disable TV Subsystem should be as following,
-         *      VP -> Mixer -> HDMI
-         *
-         * To achieve such sequence HDMI is disabled together with HDMI PHY, via
-         * pipe clock callback.
-         */
-        cancel_delayed_work(&hdata->hotplug_work);
-        cec_notifier_set_phys_addr(hdata->notifier, CEC_PHYS_ADDR_INVALID);
+        mutex_unlock(&hdata->mutex);
 }
 
 static const struct drm_encoder_helper_funcs exynos_hdmi_encoder_helper_funcs = {
@@ -1527,6 +1541,99 @@ static const struct drm_encoder_funcs exynos_hdmi_encoder_funcs = {
         .destroy = drm_encoder_cleanup,
 };
 
+static void hdmi_audio_shutdown(struct device *dev, void *data)
+{
+        struct hdmi_context *hdata = dev_get_drvdata(dev);
+
+        mutex_lock(&hdata->mutex);
+
+        hdata->audio.mute = true;
+
+        if (hdata->powered)
+                hdmi_audio_control(hdata);
+
+        mutex_unlock(&hdata->mutex);
+}
+
+static int hdmi_audio_hw_params(struct device *dev, void *data,
+                                struct hdmi_codec_daifmt *daifmt,
+                                struct hdmi_codec_params *params)
+{
+        struct hdmi_context *hdata = dev_get_drvdata(dev);
+
+        if (daifmt->fmt != HDMI_I2S || daifmt->bit_clk_inv ||
+            daifmt->frame_clk_inv || daifmt->bit_clk_master ||
+            daifmt->frame_clk_master) {
+                dev_err(dev, "%s: Bad flags %d %d %d %d\n", __func__,
+                        daifmt->bit_clk_inv, daifmt->frame_clk_inv,
+                        daifmt->bit_clk_master,
+                        daifmt->frame_clk_master);
+                return -EINVAL;
+        }
+
+        mutex_lock(&hdata->mutex);
+
+        hdata->audio.params = *params;
+
+        if (hdata->powered) {
+                hdmi_audio_config(hdata);
+                hdmi_audio_infoframe_apply(hdata);
+        }
+
+        mutex_unlock(&hdata->mutex);
+
+        return 0;
+}
+
+static int hdmi_audio_digital_mute(struct device *dev, void *data, bool mute)
+{
+        struct hdmi_context *hdata = dev_get_drvdata(dev);
+
+        mutex_lock(&hdata->mutex);
+
+        hdata->audio.mute = mute;
+
+        if (hdata->powered)
+                hdmi_audio_control(hdata);
+
+        mutex_unlock(&hdata->mutex);
+
+        return 0;
+}
+
+static int hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf,
+                              size_t len)
+{
+        struct hdmi_context *hdata = dev_get_drvdata(dev);
+        struct drm_connector *connector = &hdata->connector;
+
+        memcpy(buf, connector->eld, min(sizeof(connector->eld), len));
+
+        return 0;
+}
+
+static const struct hdmi_codec_ops audio_codec_ops = {
+        .hw_params = hdmi_audio_hw_params,
+        .audio_shutdown = hdmi_audio_shutdown,
+        .digital_mute = hdmi_audio_digital_mute,
+        .get_eld = hdmi_audio_get_eld,
+};
+
+static int hdmi_register_audio_device(struct hdmi_context *hdata)
+{
+        struct hdmi_codec_pdata codec_data = {
+                .ops = &audio_codec_ops,
+                .max_i2s_channels = 6,
+                .i2s = 1,
+        };
+
+        hdata->audio.pdev = platform_device_register_data(
+                hdata->dev, HDMI_CODEC_DRV_NAME, PLATFORM_DEVID_AUTO,
+                &codec_data, sizeof(codec_data));
+
+        return PTR_ERR_OR_ZERO(hdata->audio.pdev);
+}
+
 static void hdmi_hotplug_work_func(struct work_struct *work)
 {
         struct hdmi_context *hdata;
@@ -1602,11 +1709,14 @@ static void hdmiphy_clk_enable(struct exynos_drm_clk *clk, bool enable)
 {
         struct hdmi_context *hdata = container_of(clk, struct hdmi_context,
                                                   phy_clk);
+        mutex_lock(&hdata->mutex);
 
         if (enable)
                 hdmiphy_enable(hdata);
         else
                 hdmiphy_disable(hdata);
+
+        mutex_unlock(&hdata->mutex);
 }
 
 static int hdmi_bridge_init(struct hdmi_context *hdata)
@@ -1817,6 +1927,7 @@ out:
 
 static int hdmi_probe(struct platform_device *pdev)
 {
+        struct hdmi_audio_infoframe *audio_infoframe;
         struct device *dev = &pdev->dev;
         struct hdmi_context *hdata;
         struct resource *res;
@@ -1832,6 +1943,8 @@ static int hdmi_probe(struct platform_device *pdev)
 
         hdata->dev = dev;
 
+        mutex_init(&hdata->mutex);
+
         ret = hdmi_resources_init(hdata);
         if (ret) {
                 if (ret != -EPROBE_DEFER)
@@ -1891,12 +2004,26 @@ static int hdmi_probe(struct platform_device *pdev)
 
         pm_runtime_enable(dev);
 
-        ret = component_add(&pdev->dev, &hdmi_component_ops);
+        audio_infoframe = &hdata->audio.infoframe;
+        hdmi_audio_infoframe_init(audio_infoframe);
+        audio_infoframe->coding_type = HDMI_AUDIO_CODING_TYPE_STREAM;
+        audio_infoframe->sample_size = HDMI_AUDIO_SAMPLE_SIZE_STREAM;
+        audio_infoframe->sample_frequency = HDMI_AUDIO_SAMPLE_FREQUENCY_STREAM;
+        audio_infoframe->channels = 2;
+
+        ret = hdmi_register_audio_device(hdata);
         if (ret)
                 goto err_notifier_put;
 
+        ret = component_add(&pdev->dev, &hdmi_component_ops);
+        if (ret)
+                goto err_unregister_audio;
+
         return ret;
 
+err_unregister_audio:
+        platform_device_unregister(hdata->audio.pdev);
+
 err_notifier_put:
         cec_notifier_put(hdata->notifier);
         pm_runtime_disable(dev);
@@ -1920,6 +2047,7 @@ static int hdmi_remove(struct platform_device *pdev)
         cec_notifier_set_phys_addr(hdata->notifier, CEC_PHYS_ADDR_INVALID);
 
         component_del(&pdev->dev, &hdmi_component_ops);
+        platform_device_unregister(hdata->audio.pdev);
 
         cec_notifier_put(hdata->notifier);
         pm_runtime_disable(&pdev->dev);
@@ -1935,6 +2063,8 @@ static int hdmi_remove(struct platform_device *pdev)
 
         put_device(&hdata->ddc_adpt->dev);
 
+        mutex_destroy(&hdata->mutex);
+
         return 0;
 }
 
diff --git a/drivers/gpu/drm/exynos/regs-hdmi.h b/drivers/gpu/drm/exynos/regs-hdmi.h
index a0507dc18d9e..04be0f7e8193 100644
--- a/drivers/gpu/drm/exynos/regs-hdmi.h
+++ b/drivers/gpu/drm/exynos/regs-hdmi.h
@@ -419,11 +419,9 @@
 #define HDMI_I2S_DSD_CON                HDMI_I2S_BASE(0x01c)
 #define HDMI_I2S_MUX_CON                HDMI_I2S_BASE(0x020)
 #define HDMI_I2S_CH_ST_CON              HDMI_I2S_BASE(0x024)
-#define HDMI_I2S_CH_ST_0                HDMI_I2S_BASE(0x028)
-#define HDMI_I2S_CH_ST_1                HDMI_I2S_BASE(0x02c)
-#define HDMI_I2S_CH_ST_2                HDMI_I2S_BASE(0x030)
-#define HDMI_I2S_CH_ST_3                HDMI_I2S_BASE(0x034)
-#define HDMI_I2S_CH_ST_4                HDMI_I2S_BASE(0x038)
+/* n must be within range 0...(HDMI_I2S_CH_ST_MAXNUM - 1) */
+#define HDMI_I2S_CH_ST_MAXNUM           5
+#define HDMI_I2S_CH_ST(n)               HDMI_I2S_BASE(0x028 + 4 * (n))
 #define HDMI_I2S_CH_ST_SH_0             HDMI_I2S_BASE(0x03c)
 #define HDMI_I2S_CH_ST_SH_1             HDMI_I2S_BASE(0x040)
 #define HDMI_I2S_CH_ST_SH_2             HDMI_I2S_BASE(0x044)