drm: sti: HDMI add audio infoframe

Add a default audio infoframe for HDMI compliance

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

1 files changed, 137 insertions, 42 deletions

diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index e840ca5de401..1485ade98710 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -42,8 +42,17 @@
 #define HDMI_SW_DI_1_PKT_WORD5          0x0228
 #define HDMI_SW_DI_1_PKT_WORD6          0x022C
 #define HDMI_SW_DI_CFG                  0x0230
+#define HDMI_SW_DI_2_HEAD_WORD          0x0600
+#define HDMI_SW_DI_2_PKT_WORD0          0x0604
+#define HDMI_SW_DI_2_PKT_WORD1          0x0608
+#define HDMI_SW_DI_2_PKT_WORD2          0x060C
+#define HDMI_SW_DI_2_PKT_WORD3          0x0610
+#define HDMI_SW_DI_2_PKT_WORD4          0x0614
+#define HDMI_SW_DI_2_PKT_WORD5          0x0618
+#define HDMI_SW_DI_2_PKT_WORD6          0x061C
 
 #define HDMI_IFRAME_SLOT_AVI            1
+#define HDMI_IFRAME_SLOT_AUDIO          2
 
 #define  XCAT(prefix, x, suffix)        prefix ## x ## suffix
 #define  HDMI_SW_DI_N_HEAD_WORD(x)      XCAT(HDMI_SW_DI_, x, _HEAD_WORD)
@@ -99,6 +108,10 @@
 
 #define HDMI_STA_SW_RST                 BIT(1)
 
+#define HDMI_INFOFRAME_HEADER_TYPE(x)    (((x) & 0xff) <<  0)
+#define HDMI_INFOFRAME_HEADER_VERSION(x) (((x) & 0xff) <<  8)
+#define HDMI_INFOFRAME_HEADER_LEN(x)     (((x) & 0x0f) << 16)
+
 struct sti_hdmi_connector {
         struct drm_connector drm_connector;
         struct drm_encoder *encoder;
@@ -228,6 +241,90 @@ static void hdmi_config(struct sti_hdmi *hdmi)
 }
 
 /**
+ * Helper to concatenate infoframe in 32 bits word
+ *
+ * @ptr: pointer on the hdmi internal structure
+ * @data: infoframe to write
+ * @size: size to write
+ */
+static inline unsigned int hdmi_infoframe_subpack(const u8 *ptr, size_t size)
+{
+        unsigned long value = 0;
+        size_t i;
+
+        for (i = size; i > 0; i--)
+                value = (value << 8) | ptr[i - 1];
+
+        return value;
+}
+
+/**
+ * Helper to write info frame
+ *
+ * @hdmi: pointer on the hdmi internal structure
+ * @data: infoframe to write
+ * @size: size to write
+ */
+static void hdmi_infoframe_write_infopack(struct sti_hdmi *hdmi, const u8 *data)
+{
+        const u8 *ptr = data;
+        u32 val, slot, mode, i;
+        u32 head_offset, pack_offset;
+        size_t size;
+
+        switch (*ptr) {
+        case HDMI_INFOFRAME_TYPE_AVI:
+                slot = HDMI_IFRAME_SLOT_AVI;
+                mode = HDMI_IFRAME_FIELD;
+                head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI);
+                pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI);
+                size = HDMI_AVI_INFOFRAME_SIZE;
+                break;
+
+        case HDMI_INFOFRAME_TYPE_AUDIO:
+                slot = HDMI_IFRAME_SLOT_AUDIO;
+                mode = HDMI_IFRAME_FRAME;
+                head_offset = HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AUDIO);
+                pack_offset = HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AUDIO);
+                size = HDMI_AUDIO_INFOFRAME_SIZE;
+                break;
+
+        default:
+                DRM_ERROR("unsupported infoframe type: %#x\n", *ptr);
+                return;
+        }
+
+        /* Disable transmission slot for updated infoframe */
+        val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
+        val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, slot);
+        hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
+
+        val = HDMI_INFOFRAME_HEADER_TYPE(*ptr++);
+        val |= HDMI_INFOFRAME_HEADER_VERSION(*ptr++);
+        val |= HDMI_INFOFRAME_HEADER_LEN(*ptr++);
+        writel(val, hdmi->regs + head_offset);
+
+        /*
+         * Each subpack contains 4 bytes
+         * The First Bytes of the first subpacket must contain the checksum
+         * Packet size in increase by one.
+         */
+        for (i = 0; i < size; i += sizeof(u32)) {
+                size_t num;
+
+                num = min_t(size_t, size - i, sizeof(u32));
+                val = hdmi_infoframe_subpack(ptr, num);
+                ptr += sizeof(u32);
+                writel(val, hdmi->regs + pack_offset + i);
+        }
+
+        /* Enable transmission slot for updated infoframe */
+        val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
+        val |= HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_FIELD, slot);
+        hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
+}
+
+/**
  * Prepare and configure the AVI infoframe
  *
  * AVI infoframe are transmitted at least once per two video field and
@@ -243,8 +340,6 @@ static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
         struct drm_display_mode *mode = &hdmi->mode;
         struct hdmi_avi_infoframe infoframe;
         u8 buffer[HDMI_INFOFRAME_SIZE(AVI)];
-        u8 *frame = buffer + HDMI_INFOFRAME_HEADER_SIZE;
-        u32 val;
         int ret;
 
         DRM_DEBUG_DRIVER("\n");
@@ -266,47 +361,43 @@ static int hdmi_avi_infoframe_config(struct sti_hdmi *hdmi)
                 return ret;
         }
 
-        /* Disable transmission slot for AVI infoframe */
-        val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
-        val &= ~HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_MASK, HDMI_IFRAME_SLOT_AVI);
-        hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
+        hdmi_infoframe_write_infopack(hdmi, buffer);
 
-        /* Infoframe header */
-        val =  buffer[0];
-        val |= buffer[1] << 8;
-        val |= buffer[2] << 16;
-        hdmi_write(hdmi, val, HDMI_SW_DI_N_HEAD_WORD(HDMI_IFRAME_SLOT_AVI));
-
-        /* Infoframe packet bytes */
-        val =  buffer[3];
-        val |= *(frame++) << 8;
-        val |= *(frame++) << 16;
-        val |= *(frame++) << 24;
-        hdmi_write(hdmi, val, HDMI_SW_DI_N_PKT_WORD0(HDMI_IFRAME_SLOT_AVI));
-
-        val =  *(frame++);
-        val |= *(frame++) << 8;
-        val |= *(frame++) << 16;
-        val |= *(frame++) << 24;
-        hdmi_write(hdmi, val, HDMI_SW_DI_N_PKT_WORD1(HDMI_IFRAME_SLOT_AVI));
-
-        val =  *(frame++);
-        val |= *(frame++) << 8;
-        val |= *(frame++) << 16;
-        val |= *(frame++) << 24;
-        hdmi_write(hdmi, val, HDMI_SW_DI_N_PKT_WORD2(HDMI_IFRAME_SLOT_AVI));
-
-        val = *(frame++);
-        val |= *(frame) << 8;
-        hdmi_write(hdmi, val, HDMI_SW_DI_N_PKT_WORD3(HDMI_IFRAME_SLOT_AVI));
-
-        /* Enable transmission slot for AVI infoframe
-         * According to the hdmi specification, AVI infoframe should be
-         * transmitted at least once per two video fields
-         */
-        val = hdmi_read(hdmi, HDMI_SW_DI_CFG);
-        val |= HDMI_IFRAME_CFG_DI_N(HDMI_IFRAME_FIELD, HDMI_IFRAME_SLOT_AVI);
-        hdmi_write(hdmi, val, HDMI_SW_DI_CFG);
+        return 0;
+}
+
+/**
+ * Prepare and configure the AUDIO infoframe
+ *
+ * AUDIO infoframe are transmitted once per frame and
+ * contains information about HDMI transmission mode such as audio codec,
+ * sample size, ...
+ *
+ * @hdmi: pointer on the hdmi internal structure
+ *
+ * Return negative value if error occurs
+ */
+static int hdmi_audio_infoframe_config(struct sti_hdmi *hdmi)
+{
+        struct hdmi_audio_infoframe infofame;
+        u8 buffer[HDMI_INFOFRAME_SIZE(AUDIO)];
+        int ret;
+
+        ret = hdmi_audio_infoframe_init(&infofame);
+        if (ret < 0) {
+                DRM_ERROR("failed to setup audio infoframe: %d\n", ret);
+                return ret;
+        }
+
+        infofame.channels = 2;
+
+        ret = hdmi_audio_infoframe_pack(&infofame, buffer, sizeof(buffer));
+        if (ret < 0) {
+                DRM_ERROR("failed to pack audio infoframe: %d\n", ret);
+                return ret;
+        }
+
+        hdmi_infoframe_write_infopack(hdmi, buffer);
 
         return 0;
 }
@@ -427,6 +518,10 @@ static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
         if (hdmi_avi_infoframe_config(hdmi))
                 DRM_ERROR("Unable to configure AVI infoframe\n");
 
+        /* Program AUDIO infoframe */
+        if (hdmi_audio_infoframe_config(hdmi))
+                DRM_ERROR("Unable to configure AUDIO infoframe\n");
+
         /* Sw reset */
         hdmi_swreset(hdmi);
 }