ODROIDXU3 : add HDMI signal strength control parameter.

Change-Id: Ie48d5e8785a36c11f242861b885d6c1c9a217bad

drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -218,6 +218,243 @@ struct hdmiphy_config {
 	u8 conf[32];
 };
 
+//-----------------------------------------------------------------------------
+#if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE)
+
+//-----------------------------------------------------------------------------
+//
+//  TMDS data amplitude control.
+//  1LSB corresponds to 20 mVdiff amplitude level.
+//  tx_amp_lvl : 0 = 760 mVdiff(Min), 31 = 1380 mVdiff(Max)
+//
+//  Hardkernel default hdmi_tx_amp_lvl = 31(1380 mVdiff);
+//  Samsung default hdmi_tx_amp_lvl = 13(1020 mVdiff);
+//
+//-----------------------------------------------------------------------------
+unsigned long   gTxAmpLevel = 31;   // Default setup
+
+static int __init hdmi_tx_amp_lvl(char *line)
+{
+    if(kstrtoul(line, 10, &gTxAmpLevel) != 0)   gTxAmpLevel = 31;
+
+    if(gTxAmpLevel > 31)    gTxAmpLevel = 31;
+
+    return  0;
+}
+__setup("hdmi_tx_amp_lvl=", hdmi_tx_amp_lvl);
+
+//-----------------------------------------------------------------------------
+//
+//  TMDS data amplitude fine control for each channel.
+//  1LSB corresponds to 20 mVdiff amplitude level.
+//  tx_lvl : 0 = 0 mVdiff(Min), 3 = 60 mVdiff(Max)
+//
+//  Hardkernel default
+//      hdmi_tx_lvl_ch0 = 3, hdmi_tx_lvl_ch1 = 3, hdmi_tx_lvl_ch2 = 3,
+//  Samsung default
+//      hdmi_tx_lvl_ch0 = 1, hdmi_tx_lvl_ch1 = 0, hdmi_tx_lvl_ch2 = 2,
+//
+//-----------------------------------------------------------------------------
+unsigned long   gTxLevelCh0 = 3;    // Default setup
+unsigned long   gTxLevelCh1 = 3;    // Default setup
+unsigned long   gTxLevelCh2 = 3;    // Default setup
+
+static int __init hdmi_tx_lvl_ch0(char *line)
+{
+    if(kstrtoul(line, 10, &gTxLevelCh0) != 0)   gTxLevelCh0 = 3;
+
+    if(gTxLevelCh0 > 3)     gTxLevelCh0 = 3;
+
+    return  0;
+}
+
+static int __init hdmi_tx_lvl_ch1(char *line)
+{
+    if(kstrtoul(line, 10, &gTxLevelCh1) != 0)   gTxLevelCh1 = 3;
+
+    if(gTxLevelCh1 > 3)     gTxLevelCh1 = 3;
+
+    return  0;
+}
+
+static int __init hdmi_tx_lvl_ch2(char *line)
+{
+    if(kstrtoul(line, 10, &gTxLevelCh2) != 0)   gTxLevelCh2 = 3;
+
+    if(gTxLevelCh2 > 3)     gTxLevelCh2 = 3;
+
+    return  0;
+}
+__setup("hdmi_tx_lvl_ch0=", hdmi_tx_lvl_ch0);
+__setup("hdmi_tx_lvl_ch1=", hdmi_tx_lvl_ch1);
+__setup("hdmi_tx_lvl_ch2=", hdmi_tx_lvl_ch2);
+
+//-----------------------------------------------------------------------------
+//
+//  TMDS data pre-emphasis level control.
+//  1LSB corresponds to -0.45dB emphasis level except for 1
+//  tx_emp_lvl : 0 = 0 db(Min), 1 = -0.25 db, 2 = 0.7 db, 15 = -7.45 db(Max)
+//
+//  Hardkernel default hdmi_tx_emp_lvl = 6 (-2.50 db);
+//  Samsung default hdmi_tx_emp_lvl = 6 (-2.50 db);
+//
+//-----------------------------------------------------------------------------
+unsigned long   gTxEmpLevel = 6;    // Default setup
+
+static int __init hdmi_tx_emp_lvl(char *line)
+{
+    if(kstrtoul(line, 10, &gTxEmpLevel) != 0)   gTxEmpLevel = 6;
+
+    if(gTxEmpLevel > 15)    gTxEmpLevel = 6;
+
+    return  0;
+}
+__setup("hdmi_tx_emp_lvl=", hdmi_tx_emp_lvl);
+
+//-----------------------------------------------------------------------------
+//
+//  TMDS clock amplitude control.
+//  1LSB corresponds to 20 mVdiff amplitude level.
+//  clk_amp_lvl : 0 = 790 mVdiff(Min), 31 = 1410 mVdiff(Max)
+//
+//  Hardkernel default hdmi_clk_amp_lvl = 31 (1410 mVdiff)
+//  Samsung default hdmi_clk_amp_lvl = 16 (1110 mVdiff)
+//
+//-----------------------------------------------------------------------------
+unsigned long   gClkAmpLevel = 31;  // Default setup
+
+static int __init hdmi_clk_amp_lvl(char *line)
+{
+    if(kstrtoul(line, 10, &gClkAmpLevel) != 0)  gClkAmpLevel = 31;
+
+    if(gClkAmpLevel > 31)   gClkAmpLevel = 31;
+
+    return  0;
+}
+__setup("hdmi_clk_amp_lvl=", hdmi_clk_amp_lvl);
+
+//-----------------------------------------------------------------------------
+//
+//  TMDS data source termination resistor control.
+//  tx_res :
+//      0 = Source Termination OFF(Min), 1 = 200 ohm, 2 = 300 ohm, 3 = 120 ohm(Max)
+//
+//  Hardkernrel default hdmi_tx_res = 0 (Source Termination OFF)
+//  Samsung default hdmi_tx_res = 0 (Source Termination OFF)
+//
+//-----------------------------------------------------------------------------
+unsigned long   gTxRes = 0; // Default setup
+
+static int __init hdmi_tx_res(char *line)
+{
+    if(kstrtoul(line, 10, &gTxRes) != 0)    gTxRes = 0;
+
+    if(gTxRes > 3)  gTxRes = 0;
+
+    return  0;
+}
+__setup("hdmi_tx_res=", hdmi_tx_res);
+
+//-----------------------------------------------------------------------------
+#if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE_DEBUG)
+
+void hdmi_phy_tune_info(unsigned char *buffer)
+{
+    unsigned char  value;
+
+    printk("========================================\n");
+    printk("         HDMI PHY TUNE INFO\n");
+    printk("========================================\n");
+    value = buffer[16] & 0x0F;  value <<= 1;
+    value |= (buffer[15] & 0x80) ? 0x01 : 0x00;
+
+    printk("TX_AMP_LVL[%d] (760 mVdiff ~ 1380 mVdiff) = %d mVdiff\n",
+        value, 760 + (unsigned short)value * 20);
+
+    value = (buffer[4] & 0xC0) >> 6;
+    printk("TX_LVL_CH0[%d] (0 mVdiff ~ 60 mVdiff) = %d mVdiff\n",
+        value, value * 20);
+
+    value = buffer[19] & 0x03;
+    printk("TX_LVL_CH1[%d] (0 mVdiff ~ 60 mVdiff) = %d mVdiff\n",
+        value, value * 20);
+
+    value = buffer[23] & 0x03;
+    printk("TX_LVL_CH2[%d] (0 mVdiff ~ 60 mVdiff) = %d mVdiff\n",
+        value, value * 20);
+
+    value = (buffer[16] & 0xF0) >> 4;
+    printk("TX_EMP_LVL[%d] (0 db ~ -7.45 db) = ", value);
+
+    if(value == 1)  printk("-0.25 db\n");
+    else    {
+        if(value)   printk("-%d.%02d db\n",
+            (25 + 45 * (unsigned short)(value -1)) / 100,
+            (25 + 45 * (unsigned short)(value -1)) % 100);
+        else        printk("0 db\n");
+    }
+
+    value = (buffer[23] & 0xF8) >> 3;
+    printk("TX_CLK_LVL[%d] (790 mVdiff ~ 1410 mVdiff) = %d mVdiff\n",
+        value, 790 + (unsigned short)value * 20);
+
+    value = (buffer[15] & 0x30) >> 4;
+    printk("TX_RES[%d] = ", value);
+    switch(value)   {
+        case    0:
+        default :   printk("Source Termination OFF\n");
+            break;
+        case    1:  printk("200 ohm\n");
+            break;
+        case    2:  printk("300 ohm\n");
+            break;
+        case    3:  printk("120 ohm\n");
+            break;
+    }
+    printk("========================================\n");
+}
+
+#endif  // #if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE_DEBUG)
+
+//-----------------------------------------------------------------------------
+void hdmi_phy_tune(unsigned char *buffer)
+{
+    // TxAmpLevel Control
+    buffer[16] &= (~0x0F);    buffer[15] &= (~0x80);
+
+    buffer[16] |= (gTxAmpLevel >> 1) & 0x0F;
+    buffer[15] |= (gTxAmpLevel & 0x01) ? 0x80 : 0x00;
+
+    // TxLevel Control 0
+    buffer[4] &= (~0xC0);
+    buffer[4] |= (gTxLevelCh0 << 6) & 0xC0;
+
+    // TxLevel Control 1
+    buffer[19] &= (~0x03);
+    buffer[19] |= (gTxLevelCh1 & 0x03);
+
+    // TxLevel Control 2
+    buffer[23] &= (~0x03);
+    buffer[23] |= (gTxLevelCh2 & 0x03);
+
+    // TxEmpLevel Control
+    buffer[16] &= (~0xF0);
+    buffer[16] |= (gTxEmpLevel << 4) & 0xF0;
+
+    //ClkAmpLevel Control
+    buffer[23] &= (~0xF8);
+    buffer[23] |= (gClkAmpLevel << 3) & 0xF8;
+
+    // TxRes Control
+    buffer[15] &= (~0x30);
+    buffer[15] |= (gTxRes << 4) & 0x30;
+}
+
+//-----------------------------------------------------------------------------
+#endif  // #if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE)
+
+//-----------------------------------------------------------------------------
+
 /* list of phy config settings */
 static const struct hdmiphy_config hdmiphy_v13_configs[] = {
 	{
@@ -642,20 +879,36 @@ static int hdmiphy_reg_writeb(struct hdmi_context *hdata,
 static int hdmiphy_reg_write_buf(struct hdmi_context *hdata,
 			u32 reg_offset, const u8 *buf, u32 len)
 {
+    u8 buffer[32];
+
 	if ((reg_offset + len) > 32)
 		return -EINVAL;
 
+    memset(buffer, 0x00, sizeof(buffer));
+    memcpy(buffer, buf, len);
+
+#if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE)
+
+    hdmi_phy_tune(buffer);
+
+    #if defined(CONFIG_ODROID_EXYNOS5_HDMI_PHY_TUNE_DEBUG)
+        // Current HDMI-PHY Info Display
+        hdmi_phy_tune_info(buffer);
+    #endif
+
+#endif
+
 	if (hdata->hdmiphy_port) {
 		int ret;
 
-		ret = i2c_master_send(hdata->hdmiphy_port, buf, len);
+		ret = i2c_master_send(hdata->hdmiphy_port, buffer, len);
 		if (ret == len)
 			return 0;
 		return ret;
 	} else {
 		int i;
 		for (i = 0; i < len; i++)
-			writeb(buf[i], hdata->regs_hdmiphy +
+			writeb(buffer[i], hdata->regs_hdmiphy +
 				((reg_offset + i)<<2));
 		return 0;
 	}

drivers/hardkernel/Kconfig

@@ -28,5 +28,20 @@ config ODROID_EXYNOS5_IOBOARD_DEBUG
 	---help---
 		Enables the IOBOARD Debug Message
 
+config ODROID_EXYNOS5_HDMI_PHY_TUNE
+    bool "Enable HDMI-PHY tune functions"
+	depends on MACH_ODROIDXU3
+	default y
+	help
+	    Enables HDMI-PHY tune functions.
+
+config ODROID_EXYNOS5_HDMI_PHY_TUNE_DEBUG
+	depends on MACH_ODROIDXU3 && ODROID_EXYNOS5_HDMI_PHY_TUNE
+    bool "Enable HDMI-PHY tune info display"
+	depends on MACH_ODROIDXU3
+	default n
+	help
+	    Enables HDMI-PHY tune info display.
+
 endmenu