[PATCH 2/2] drm: exynos: compose and send avi and aui info frames

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This patch adds code for composing AVI and AUI info frames
and send them every VSYNC.

This patch is important for hdmi certification.

Signed-off-by: Fahad Kunnathadi <fahad.k@xxxxxxxxxxx>
Signed-off-by: Shirish S <s.shirish@xxxxxxxxxxx>
Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c |   97 +++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/exynos/exynos_hdmi.h |   23 ++++++++
 drivers/gpu/drm/exynos/regs-hdmi.h   |   17 +++++-
 3 files changed, 133 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 2c115f8..bb8a045 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -82,6 +82,7 @@ struct hdmi_context {
 
 	/* current hdmiphy conf index */
 	int cur_conf;
+	int cur_video_id;
 
 	struct hdmi_resources		res;
 	void				*parent_ctx;
@@ -944,6 +945,11 @@ static const struct hdmi_conf hdmi_confs[] = {
 	{ 1920, 1080, 60, false, hdmiphy_conf148_5, &hdmi_conf_1080p60 },
 };
 
+struct hdmi_infoframe {
+	enum HDMI_PACKET_TYPE type;
+	u8 ver;
+	u8 len;
+};
 
 static inline u32 hdmi_reg_read(struct hdmi_context *hdata, u32 reg_id)
 {
@@ -1267,6 +1273,81 @@ static int hdmi_conf_index(struct hdmi_context *hdata,
 	return hdmi_v14_conf_index(mode);
 }
 
+static u8 hdmi_chksum(struct hdmi_context *hdata,
+			u32 start, u8 len, u32 hdr_sum)
+{
+	int i;
+	/* hdr_sum : header0 + header1 + header2
+	* start : start address of packet byte1
+	* len : packet bytes - 1 */
+	for (i = 0; i < len; ++i)
+		hdr_sum += 0xff & hdmi_reg_read(hdata, start + i * 4);
+
+	return (u8)(0x100 - (hdr_sum & 0xff));
+}
+
+void hdmi_reg_infoframe(struct hdmi_context *hdata,
+			struct hdmi_infoframe *infoframe)
+{
+	u32 hdr_sum;
+	u8 chksum;
+	u32 aspect_ratio;
+	u32 mod;
+
+	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+	mod = hdmi_reg_read(hdata, HDMI_MODE_SEL);
+	if (hdata->dvi_mode) {
+		hdmi_reg_writeb(hdata, HDMI_VSI_CON,
+				HDMI_VSI_CON_DO_NOT_TRANSMIT);
+		hdmi_reg_writeb(hdata, HDMI_AVI_CON,
+				HDMI_AVI_CON_DO_NOT_TRANSMIT);
+		hdmi_reg_writeb(hdata, HDMI_AUI_CON, HDMI_AUI_CON_NO_TRAN);
+		return;
+	}
+
+	switch (infoframe->type) {
+
+	case HDMI_PACKET_TYPE_AVI:
+		hdmi_reg_writeb(hdata, HDMI_AVI_CON, HDMI_AVI_CON_EVERY_VSYNC);
+		hdmi_reg_writeb(hdata, HDMI_AVI_HEADER0, infoframe->type);
+		hdmi_reg_writeb(hdata, HDMI_AVI_HEADER1, infoframe->ver);
+		hdmi_reg_writeb(hdata, HDMI_AVI_HEADER2, infoframe->len);
+		hdr_sum = infoframe->type + infoframe->ver + infoframe->len;
+		/* Output format zero hardcoded ,RGB YBCR selection */
+		hdmi_reg_writeb(hdata, HDMI_AVI_BYTE(1), 0 << 5 |
+			AVI_ACTIVE_FORMAT_VALID |
+			AVI_UNDERSCANNED_DISPLAY_VALID);
+
+		aspect_ratio = AVI_PIC_ASPECT_RATIO_16_9;
+
+		hdmi_reg_writeb(hdata, HDMI_AVI_BYTE(2), aspect_ratio |
+				AVI_SAME_AS_PIC_ASPECT_RATIO);
+		hdmi_reg_writeb(hdata, HDMI_AVI_BYTE(4), hdata->cur_video_id);
+
+		chksum = hdmi_chksum(hdata, HDMI_AVI_BYTE(1),
+					infoframe->len, hdr_sum);
+		DRM_DEBUG_KMS("AVI checksum = 0x%x\n", chksum);
+		hdmi_reg_writeb(hdata, HDMI_AVI_CHECK_SUM, chksum);
+		break;
+
+	case HDMI_PACKET_TYPE_AUI:
+		hdmi_reg_writeb(hdata, HDMI_AUI_CON, 0x02);
+		hdmi_reg_writeb(hdata, HDMI_AUI_HEADER0, infoframe->type);
+		hdmi_reg_writeb(hdata, HDMI_AUI_HEADER1, infoframe->ver);
+		hdmi_reg_writeb(hdata, HDMI_AUI_HEADER2, infoframe->len);
+		hdr_sum = infoframe->type + infoframe->ver + infoframe->len;
+		chksum = hdmi_chksum(hdata, HDMI_AUI_BYTE(1),
+					infoframe->len, hdr_sum);
+		DRM_DEBUG_KMS("AUI checksum = 0x%x\n", chksum);
+		hdmi_reg_writeb(hdata, HDMI_AUI_CHECK_SUM, chksum);
+		break;
+
+	default:
+		break;
+	}
+}
+
 static bool hdmi_is_connected(void *ctx)
 {
 	struct hdmi_context *hdata = ctx;
@@ -1541,6 +1622,8 @@ static void hdmi_conf_reset(struct hdmi_context *hdata)
 
 static void hdmi_conf_init(struct hdmi_context *hdata)
 {
+	struct hdmi_infoframe infoframe;
+
 	/* disable HPD interrupts */
 	hdmi_reg_writemask(hdata, HDMI_INTC_CON, 0, HDMI_INTC_EN_GLOBAL |
 		HDMI_INTC_EN_HPD_PLUG | HDMI_INTC_EN_HPD_UNPLUG);
@@ -1575,9 +1658,17 @@ static void hdmi_conf_init(struct hdmi_context *hdata)
 		hdmi_reg_writeb(hdata, HDMI_V13_AUI_CON, 0x02);
 		hdmi_reg_writeb(hdata, HDMI_V13_ACR_CON, 0x04);
 	} else {
+		infoframe.type = HDMI_PACKET_TYPE_AVI;
+		infoframe.ver = HDMI_AVI_VERSION;
+		infoframe.len = HDMI_AVI_LENGTH;
+		hdmi_reg_infoframe(hdata, &infoframe);
+
+		infoframe.type = HDMI_PACKET_TYPE_AUI;
+		infoframe.ver = HDMI_AUI_VERSION;
+		infoframe.len = HDMI_AUI_LENGTH;
+		hdmi_reg_infoframe(hdata, &infoframe);
+
 		/* enable AVI packet every vsync, fixes purple line problem */
-		hdmi_reg_writeb(hdata, HDMI_AVI_CON, 0x02);
-		hdmi_reg_writeb(hdata, HDMI_AVI_BYTE(1), 2 << 5);
 		hdmi_reg_writemask(hdata, HDMI_CON_1, 2, 3 << 5);
 	}
 }
@@ -1993,6 +2084,8 @@ static void hdmi_mode_set(void *ctx, void *mode)
 
 	DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
 
+	hdata->cur_video_id = drm_match_cea_mode(mode);
+
 	conf_idx = hdmi_conf_index(hdata, mode);
 	if (conf_idx >= 0)
 		hdata->cur_conf = conf_idx;
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.h b/drivers/gpu/drm/exynos/exynos_hdmi.h
index 1c3b6d8..fc4de49 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.h
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.h
@@ -28,6 +28,29 @@
 #ifndef _EXYNOS_HDMI_H_
 #define _EXYNOS_HDMI_H_
 
+/* AVI header and aspect ratio */
+#define HDMI_AVI_VERSION		0x02
+#define HDMI_AVI_LENGTH		0x0d
+#define AVI_PIC_ASPECT_RATIO_16_9	(2 << 4)
+#define AVI_SAME_AS_PIC_ASPECT_RATIO	8
+
+/* AUI header info */
+#define HDMI_AUI_VERSION		0x01
+#define HDMI_AUI_LENGTH		0x0a
+
+/* HDMI infoframe to configure HDMI out packet header, AUI and AVI */
+enum HDMI_PACKET_TYPE {
+	/** refer to Table 5-8 Packet Type in HDMI specification v1.4a */
+	/** InfoFrame packet type */
+	HDMI_PACKET_TYPE_INFOFRAME = 0X80,
+	/** Vendor-Specific InfoFrame */
+	HDMI_PACKET_TYPE_VSI = HDMI_PACKET_TYPE_INFOFRAME + 1,
+	/** Auxiliary Video information InfoFrame */
+	HDMI_PACKET_TYPE_AVI = HDMI_PACKET_TYPE_INFOFRAME + 2,
+	/** Audio information InfoFrame */
+	HDMI_PACKET_TYPE_AUI = HDMI_PACKET_TYPE_INFOFRAME + 4
+};
+
 void hdmi_attach_ddc_client(struct i2c_client *ddc);
 void hdmi_attach_hdmiphy_client(struct i2c_client *hdmiphy);
 
diff --git a/drivers/gpu/drm/exynos/regs-hdmi.h b/drivers/gpu/drm/exynos/regs-hdmi.h
index 9cc7c5e..970cdb5 100644
--- a/drivers/gpu/drm/exynos/regs-hdmi.h
+++ b/drivers/gpu/drm/exynos/regs-hdmi.h
@@ -298,14 +298,14 @@
 #define HDMI_AVI_HEADER1		HDMI_CORE_BASE(0x0714)
 #define HDMI_AVI_HEADER2		HDMI_CORE_BASE(0x0718)
 #define HDMI_AVI_CHECK_SUM		HDMI_CORE_BASE(0x071C)
-#define HDMI_AVI_BYTE(n)		HDMI_CORE_BASE(0x0720 + 4 * (n))
+#define HDMI_AVI_BYTE(n)		HDMI_CORE_BASE(0x0720 + 4 * (n-1))
 
 #define HDMI_AUI_CON			HDMI_CORE_BASE(0x0800)
 #define HDMI_AUI_HEADER0		HDMI_CORE_BASE(0x0810)
 #define HDMI_AUI_HEADER1		HDMI_CORE_BASE(0x0814)
 #define HDMI_AUI_HEADER2		HDMI_CORE_BASE(0x0818)
 #define HDMI_AUI_CHECK_SUM		HDMI_CORE_BASE(0x081C)
-#define HDMI_AUI_BYTE(n)		HDMI_CORE_BASE(0x0820 + 4 * (n))
+#define HDMI_AUI_BYTE(n)		HDMI_CORE_BASE(0x0820 + 4 * (n-1))
 
 #define HDMI_MPG_CON			HDMI_CORE_BASE(0x0900)
 #define HDMI_MPG_CHECK_SUM		HDMI_CORE_BASE(0x091C)
@@ -338,6 +338,19 @@
 #define HDMI_AN_SEED_2			HDMI_CORE_BASE(0x0E60)
 #define HDMI_AN_SEED_3			HDMI_CORE_BASE(0x0E64)
 
+/* AVI bit definition */
+#define HDMI_AVI_CON_DO_NOT_TRANSMIT	(0 << 1)
+#define HDMI_AVI_CON_EVERY_VSYNC	(1 << 1)
+
+#define AVI_ACTIVE_FORMAT_VALID	(1 << 4)
+#define AVI_UNDERSCANNED_DISPLAY_VALID	(1 << 1)
+
+/* AUI bit definition */
+#define HDMI_AUI_CON_NO_TRAN		(0 << 0)
+
+/* VSI bit definition */
+#define HDMI_VSI_CON_DO_NOT_TRANSMIT	(0 << 0)
+
 /* HDCP related registers */
 #define HDMI_HDCP_SHA1(n)		HDMI_CORE_BASE(0x7000 + 4 * (n))
 #define HDMI_HDCP_KSV_LIST(n)		HDMI_CORE_BASE(0x7050 + 4 * (n))
-- 
1.7.0.4

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