diff --git a/drivers/gpu/drm/ast/ast_dram_tables.h b/drivers/gpu/drm/ast/ast_dram_tables.h
index cc04539c0ff3dbc98aaa1d4db00e929897d8b188..1d9c4e75d3030a7ce67cdc4c16b15545da049538 100644
--- a/drivers/gpu/drm/ast/ast_dram_tables.h
+++ b/drivers/gpu/drm/ast/ast_dram_tables.h
@@ -141,4 +141,66 @@ static const struct ast_dramstruct ast2100_dram_table_data[] = {
 	{ 0xffff, 0xffffffff },
 };
 
+/*
+ * AST2500 DRAM settings modules
+ */
+#define REGTBL_NUM           17
+#define REGIDX_010           0
+#define REGIDX_014           1
+#define REGIDX_018           2
+#define REGIDX_020           3
+#define REGIDX_024           4
+#define REGIDX_02C           5
+#define REGIDX_030           6
+#define REGIDX_214           7
+#define REGIDX_2E0           8
+#define REGIDX_2E4           9
+#define REGIDX_2E8           10
+#define REGIDX_2EC           11
+#define REGIDX_2F0           12
+#define REGIDX_2F4           13
+#define REGIDX_2F8           14
+#define REGIDX_RFC           15
+#define REGIDX_PLL           16
+
+static const u32 ast2500_ddr3_1600_timing_table[REGTBL_NUM] = {
+	0x64604D38,		     /* 0x010 */
+	0x29690599,		     /* 0x014 */
+	0x00000300,		     /* 0x018 */
+	0x00000000,		     /* 0x020 */
+	0x00000000,		     /* 0x024 */
+	0x02181E70,		     /* 0x02C */
+	0x00000040,		     /* 0x030 */
+	0x00000024,		     /* 0x214 */
+	0x02001300,		     /* 0x2E0 */
+	0x0E0000A0,		     /* 0x2E4 */
+	0x000E001B,		     /* 0x2E8 */
+	0x35B8C105,		     /* 0x2EC */
+	0x08090408,		     /* 0x2F0 */
+	0x9B000800,		     /* 0x2F4 */
+	0x0E400A00,		     /* 0x2F8 */
+	0x9971452F,		     /* tRFC  */
+	0x000071C1		     /* PLL   */
+};
+
+static const u32 ast2500_ddr4_1600_timing_table[REGTBL_NUM] = {
+	0x63604E37,		     /* 0x010 */
+	0xE97AFA99,		     /* 0x014 */
+	0x00019000,		     /* 0x018 */
+	0x08000000,		     /* 0x020 */
+	0x00000400,		     /* 0x024 */
+	0x00000410,		     /* 0x02C */
+	0x00000101,		     /* 0x030 */
+	0x00000024,		     /* 0x214 */
+	0x03002900,		     /* 0x2E0 */
+	0x0E0000A0,		     /* 0x2E4 */
+	0x000E001C,		     /* 0x2E8 */
+	0x35B8C106,		     /* 0x2EC */
+	0x08080607,		     /* 0x2F0 */
+	0x9B000900,		     /* 0x2F4 */
+	0x0E400A00,		     /* 0x2F8 */
+	0x99714545,		     /* tRFC  */
+	0x000071C1		     /* PLL   */
+};
+
 #endif
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 5a8fa1c8522987517a9f98589eb658f72bc21901..8880f0b62e9c2832845d7df2f40e0e77817a9f91 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -65,6 +65,7 @@ enum ast_chip {
 	AST2150,
 	AST2300,
 	AST2400,
+	AST2500,
 	AST1180,
 };
 
@@ -81,6 +82,7 @@ enum ast_tx_chip {
 #define AST_DRAM_1Gx32   3
 #define AST_DRAM_2Gx16   6
 #define AST_DRAM_4Gx16   7
+#define AST_DRAM_8Gx16   8
 
 struct ast_fbdev;
 
@@ -114,7 +116,11 @@ struct ast_private {
 	struct ttm_bo_kmap_obj cache_kmap;
 	int next_cursor;
 	bool support_wide_screen;
-	bool DisableP2A;
+	enum {
+		ast_use_p2a,
+		ast_use_dt,
+		ast_use_defaults
+	} config_mode;
 
 	enum ast_tx_chip tx_chip_type;
 	u8 dp501_maxclk;
@@ -301,8 +307,8 @@ struct ast_vbios_dclk_info {
 };
 
 struct ast_vbios_mode_info {
-	struct ast_vbios_stdtable *std_table;
-	struct ast_vbios_enhtable *enh_table;
+	const struct ast_vbios_stdtable *std_table;
+	const struct ast_vbios_enhtable *enh_table;
 };
 
 extern int ast_mode_init(struct drm_device *dev);
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 993909430736f04dd9d420db5aed015b52098ccc..262c2c0e43b4b162fae7530f88b143814abe8949 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -32,8 +32,6 @@
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
 
-#include "ast_dram_tables.h"
-
 void ast_set_index_reg_mask(struct ast_private *ast,
 			    uint32_t base, uint8_t index,
 			    uint8_t mask, uint8_t val)
@@ -62,30 +60,99 @@ uint8_t ast_get_index_reg_mask(struct ast_private *ast,
 	return ret;
 }
 
+static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
+{
+	struct device_node *np = dev->pdev->dev.of_node;
+	struct ast_private *ast = dev->dev_private;
+	uint32_t data, jregd0, jregd1;
+
+	/* Defaults */
+	ast->config_mode = ast_use_defaults;
+	*scu_rev = 0xffffffff;
+
+	/* Check if we have device-tree properties */
+	if (np && !of_property_read_u32(np, "aspeed,scu-revision-id",
+					scu_rev)) {
+		/* We do, disable P2A access */
+		ast->config_mode = ast_use_dt;
+		DRM_INFO("Using device-tree for configuration\n");
+		return;
+	}
+
+	/* Not all families have a P2A bridge */
+	if (dev->pdev->device != PCI_CHIP_AST2000)
+		return;
+
+	/*
+	 * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
+	 * is disabled. We force using P2A if VGA only mode bit
+	 * is set D[7]
+	 */
+	jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
+	jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
+	if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
+		/* Double check it's actually working */
+		data = ast_read32(ast, 0xf004);
+		if (data != 0xFFFFFFFF) {
+			/* P2A works, grab silicon revision */
+			ast->config_mode = ast_use_p2a;
+
+			DRM_INFO("Using P2A bridge for configuration\n");
+
+			/* Read SCU7c (silicon revision register) */
+			ast_write32(ast, 0xf004, 0x1e6e0000);
+			ast_write32(ast, 0xf000, 0x1);
+			*scu_rev = ast_read32(ast, 0x1207c);
+			return;
+		}
+	}
+
+	/* We have a P2A bridge but it's disabled */
+	DRM_INFO("P2A bridge disabled, using default configuration\n");
+}
 
 static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 {
 	struct ast_private *ast = dev->dev_private;
-	uint32_t data, jreg;
+	uint32_t jreg, scu_rev;
+
+	/*
+	 * If VGA isn't enabled, we need to enable now or subsequent
+	 * access to the scratch registers will fail. We also inform
+	 * our caller that it needs to POST the chip
+	 * (Assumption: VGA not enabled -> need to POST)
+	 */
+	if (!ast_is_vga_enabled(dev)) {
+		ast_enable_vga(dev);
+		DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
+		*need_post = true;
+	} else
+		*need_post = false;
+
+
+	/* Enable extended register access */
+	ast_enable_mmio(dev);
 	ast_open_key(ast);
 
+	/* Find out whether P2A works or whether to use device-tree */
+	ast_detect_config_mode(dev, &scu_rev);
+
+	/* Identify chipset */
 	if (dev->pdev->device == PCI_CHIP_AST1180) {
 		ast->chip = AST1100;
 		DRM_INFO("AST 1180 detected\n");
 	} else {
-		if (dev->pdev->revision >= 0x30) {
+		if (dev->pdev->revision >= 0x40) {
+			ast->chip = AST2500;
+			DRM_INFO("AST 2500 detected\n");
+		} else if (dev->pdev->revision >= 0x30) {
 			ast->chip = AST2400;
 			DRM_INFO("AST 2400 detected\n");
 		} else if (dev->pdev->revision >= 0x20) {
 			ast->chip = AST2300;
 			DRM_INFO("AST 2300 detected\n");
 		} else if (dev->pdev->revision >= 0x10) {
-			uint32_t data;
-			ast_write32(ast, 0xf004, 0x1e6e0000);
-			ast_write32(ast, 0xf000, 0x1);
-
-			data = ast_read32(ast, 0x1207c);
-			switch (data & 0x0300) {
+			switch (scu_rev & 0x0300) {
 			case 0x0200:
 				ast->chip = AST1100;
 				DRM_INFO("AST 1100 detected\n");
@@ -110,26 +177,6 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 		}
 	}
 
-	/*
-	 * If VGA isn't enabled, we need to enable now or subsequent
-	 * access to the scratch registers will fail. We also inform
-	 * our caller that it needs to POST the chip
-	 * (Assumption: VGA not enabled -> need to POST)
-	 */
-	if (!ast_is_vga_enabled(dev)) {
-		ast_enable_vga(dev);
-		ast_enable_mmio(dev);
-		DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
-		*need_post = true;
-	} else
-		*need_post = false;
-
-	/* Check P2A Access */
-	ast->DisableP2A = true;
-	data = ast_read32(ast, 0xf004);
-	if (data != 0xFFFFFFFF)
-		ast->DisableP2A = false;
-
 	/* Check if we support wide screen */
 	switch (ast->chip) {
 	case AST1180:
@@ -146,17 +193,15 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 			ast->support_wide_screen = true;
 		else {
 			ast->support_wide_screen = false;
-			if (ast->DisableP2A == false) {
-				/* Read SCU7c (silicon revision register) */
-				ast_write32(ast, 0xf004, 0x1e6e0000);
-				ast_write32(ast, 0xf000, 0x1);
-				data = ast_read32(ast, 0x1207c);
-				data &= 0x300;
-				if (ast->chip == AST2300 && data == 0x0) /* ast1300 */
-					ast->support_wide_screen = true;
-				if (ast->chip == AST2400 && data == 0x100) /* ast1400 */
-					ast->support_wide_screen = true;
-			}
+			if (ast->chip == AST2300 &&
+			    (scu_rev & 0x300) == 0x0) /* ast1300 */
+				ast->support_wide_screen = true;
+			if (ast->chip == AST2400 &&
+			    (scu_rev & 0x300) == 0x100) /* ast1400 */
+				ast->support_wide_screen = true;
+			if (ast->chip == AST2500 &&
+			    scu_rev == 0x100)           /* ast2510 */
+				ast->support_wide_screen = true;
 		}
 		break;
 	}
@@ -220,85 +265,121 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 
 static int ast_get_dram_info(struct drm_device *dev)
 {
+	struct device_node *np = dev->pdev->dev.of_node;
 	struct ast_private *ast = dev->dev_private;
-	uint32_t data, data2;
-	uint32_t denum, num, div, ref_pll;
+	uint32_t mcr_cfg, mcr_scu_mpll, mcr_scu_strap;
+	uint32_t denum, num, div, ref_pll, dsel;
 
-	if (ast->DisableP2A)
-	{
-		ast->dram_bus_width = 16;
-		ast->dram_type = AST_DRAM_1Gx16;
-		ast->mclk = 396;
-	}
-	else
-	{
+	switch (ast->config_mode) {
+	case ast_use_dt:
+		/*
+		 * If some properties are missing, use reasonable
+		 * defaults for AST2400
+		 */
+		if (of_property_read_u32(np, "aspeed,mcr-configuration",
+					 &mcr_cfg))
+			mcr_cfg = 0x00000577;
+		if (of_property_read_u32(np, "aspeed,mcr-scu-mpll",
+					 &mcr_scu_mpll))
+			mcr_scu_mpll = 0x000050C0;
+		if (of_property_read_u32(np, "aspeed,mcr-scu-strap",
+					 &mcr_scu_strap))
+			mcr_scu_strap = 0;
+		break;
+	case ast_use_p2a:
 		ast_write32(ast, 0xf004, 0x1e6e0000);
 		ast_write32(ast, 0xf000, 0x1);
-		data = ast_read32(ast, 0x10004);
-
-		if (data & 0x40)
-			ast->dram_bus_width = 16;
+		mcr_cfg = ast_read32(ast, 0x10004);
+		mcr_scu_mpll = ast_read32(ast, 0x10120);
+		mcr_scu_strap = ast_read32(ast, 0x10170);
+		break;
+	case ast_use_defaults:
+	default:
+		ast->dram_bus_width = 16;
+		ast->dram_type = AST_DRAM_1Gx16;
+		if (ast->chip == AST2500)
+			ast->mclk = 800;
 		else
-			ast->dram_bus_width = 32;
-
-		if (ast->chip == AST2300 || ast->chip == AST2400) {
-			switch (data & 0x03) {
-			case 0:
-				ast->dram_type = AST_DRAM_512Mx16;
-				break;
-			default:
-			case 1:
-				ast->dram_type = AST_DRAM_1Gx16;
-				break;
-			case 2:
-				ast->dram_type = AST_DRAM_2Gx16;
-				break;
-			case 3:
-				ast->dram_type = AST_DRAM_4Gx16;
-				break;
-			}
-		} else {
-			switch (data & 0x0c) {
-			case 0:
-			case 4:
-				ast->dram_type = AST_DRAM_512Mx16;
-				break;
-			case 8:
-				if (data & 0x40)
-					ast->dram_type = AST_DRAM_1Gx16;
-				else
-					ast->dram_type = AST_DRAM_512Mx32;
-				break;
-			case 0xc:
-				ast->dram_type = AST_DRAM_1Gx32;
-				break;
-			}
-		}
+			ast->mclk = 396;
+		return 0;
+	}
 
-		data = ast_read32(ast, 0x10120);
-		data2 = ast_read32(ast, 0x10170);
-		if (data2 & 0x2000)
-			ref_pll = 14318;
-		else
-			ref_pll = 12000;
+	if (mcr_cfg & 0x40)
+		ast->dram_bus_width = 16;
+	else
+		ast->dram_bus_width = 32;
 
-		denum = data & 0x1f;
-		num = (data & 0x3fe0) >> 5;
-		data = (data & 0xc000) >> 14;
-		switch (data) {
-		case 3:
-			div = 0x4;
+	if (ast->chip == AST2500) {
+		switch (mcr_cfg & 0x03) {
+		case 0:
+			ast->dram_type = AST_DRAM_1Gx16;
 			break;
-		case 2:
+		default:
 		case 1:
-			div = 0x2;
+			ast->dram_type = AST_DRAM_2Gx16;
+			break;
+		case 2:
+			ast->dram_type = AST_DRAM_4Gx16;
+			break;
+		case 3:
+			ast->dram_type = AST_DRAM_8Gx16;
+			break;
+		}
+	} else if (ast->chip == AST2300 || ast->chip == AST2400) {
+		switch (mcr_cfg & 0x03) {
+		case 0:
+			ast->dram_type = AST_DRAM_512Mx16;
 			break;
 		default:
-			div = 0x1;
+		case 1:
+			ast->dram_type = AST_DRAM_1Gx16;
+			break;
+		case 2:
+			ast->dram_type = AST_DRAM_2Gx16;
+			break;
+		case 3:
+			ast->dram_type = AST_DRAM_4Gx16;
+			break;
+		}
+	} else {
+		switch (mcr_cfg & 0x0c) {
+		case 0:
+		case 4:
+			ast->dram_type = AST_DRAM_512Mx16;
+			break;
+		case 8:
+			if (mcr_cfg & 0x40)
+				ast->dram_type = AST_DRAM_1Gx16;
+			else
+				ast->dram_type = AST_DRAM_512Mx32;
+			break;
+		case 0xc:
+			ast->dram_type = AST_DRAM_1Gx32;
 			break;
 		}
-		ast->mclk = ref_pll * (num + 2) / (denum + 2) * (div * 1000);
 	}
+
+	if (mcr_scu_strap & 0x2000)
+		ref_pll = 14318;
+	else
+		ref_pll = 12000;
+
+	denum = mcr_scu_mpll & 0x1f;
+	num = (mcr_scu_mpll & 0x3fe0) >> 5;
+	dsel = (mcr_scu_mpll & 0xc000) >> 14;
+	switch (dsel) {
+	case 3:
+		div = 0x4;
+		break;
+	case 2:
+	case 1:
+		div = 0x2;
+		break;
+	default:
+		div = 0x1;
+		break;
+	}
+	ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
 	return 0;
 }
 
@@ -437,17 +518,19 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
 
 	ast_detect_chip(dev, &need_post);
 
+	if (need_post)
+		ast_post_gpu(dev);
+
 	if (ast->chip != AST1180) {
 		ret = ast_get_dram_info(dev);
 		if (ret)
 			goto out_free;
 		ast->vram_size = ast_get_vram_info(dev);
-		DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
+		DRM_INFO("dram MCLK=%u Mhz type=%d bus_width=%d size=%08x\n",
+			 ast->mclk, ast->dram_type,
+			 ast->dram_bus_width, ast->vram_size);
 	}
 
-	if (need_post)
-		ast_post_gpu(dev);
-
 	ret = ast_mm_init(ast);
 	if (ret)
 		goto out_free;
@@ -465,6 +548,7 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
 	    ast->chip == AST2200 ||
 	    ast->chip == AST2300 ||
 	    ast->chip == AST2400 ||
+	    ast->chip == AST2500 ||
 	    ast->chip == AST1180) {
 		dev->mode_config.max_width = 1920;
 		dev->mode_config.max_height = 2048;
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 606cb40f6c7cd6ccdaee2d5d1c61e7c105049689..47b78e52691cb33bb7cc3b189d92f35b11510340 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -81,9 +81,9 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
 	struct ast_private *ast = crtc->dev->dev_private;
 	const struct drm_framebuffer *fb = crtc->primary->fb;
 	u32 refresh_rate_index = 0, mode_id, color_index, refresh_rate;
+	const struct ast_vbios_enhtable *best = NULL;
 	u32 hborder, vborder;
 	bool check_sync;
-	struct ast_vbios_enhtable *best = NULL;
 
 	switch (fb->format->cpp[0] * 8) {
 	case 8:
@@ -147,7 +147,7 @@ static bool ast_get_vbios_mode_info(struct drm_crtc *crtc, struct drm_display_mo
 	refresh_rate = drm_mode_vrefresh(mode);
 	check_sync = vbios_mode->enh_table->flags & WideScreenMode;
 	do {
-		struct ast_vbios_enhtable *loop = vbios_mode->enh_table;
+		const struct ast_vbios_enhtable *loop = vbios_mode->enh_table;
 
 		while (loop->refresh_rate != 0xff) {
 			if ((check_sync) &&
@@ -227,7 +227,7 @@ static void ast_set_std_reg(struct drm_crtc *crtc, struct drm_display_mode *mode
 			    struct ast_vbios_mode_info *vbios_mode)
 {
 	struct ast_private *ast = crtc->dev->dev_private;
-	struct ast_vbios_stdtable *stdtable;
+	const struct ast_vbios_stdtable *stdtable;
 	u32 i;
 	u8 jreg;
 
@@ -273,7 +273,11 @@ static void ast_set_crtc_reg(struct drm_crtc *crtc, struct drm_display_mode *mod
 {
 	struct ast_private *ast = crtc->dev->dev_private;
 	u8 jreg05 = 0, jreg07 = 0, jreg09 = 0, jregAC = 0, jregAD = 0, jregAE = 0;
-	u16 temp;
+	u16 temp, precache = 0;
+
+	if ((ast->chip == AST2500) &&
+	    (vbios_mode->enh_table->flags & AST2500PreCatchCRT))
+		precache = 40;
 
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x7f, 0x00);
 
@@ -299,12 +303,12 @@ static void ast_set_crtc_reg(struct drm_crtc *crtc, struct drm_display_mode *mod
 		jregAD |= 0x01;  /* HBE D[5] */
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x03, 0xE0, (temp & 0x1f));
 
-	temp = (mode->crtc_hsync_start >> 3) - 1;
+	temp = ((mode->crtc_hsync_start-precache) >> 3) - 1;
 	if (temp & 0x100)
 		jregAC |= 0x40; /* HRS D[5] */
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x04, 0x00, temp);
 
-	temp = ((mode->crtc_hsync_end >> 3) - 1) & 0x3f;
+	temp = (((mode->crtc_hsync_end-precache) >> 3) - 1) & 0x3f;
 	if (temp & 0x20)
 		jregAD |= 0x04; /* HRE D[5] */
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x05, 0x60, (u8)((temp & 0x1f) | jreg05));
@@ -365,6 +369,11 @@ static void ast_set_crtc_reg(struct drm_crtc *crtc, struct drm_display_mode *mod
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x09, 0xdf, jreg09);
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xAE, 0x00, (jregAE | 0x80));
 
+	if (precache)
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0x3f, 0x80);
+	else
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0x3f, 0x00);
+
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x11, 0x7f, 0x80);
 }
 
@@ -384,14 +393,18 @@ static void ast_set_dclk_reg(struct drm_device *dev, struct drm_display_mode *mo
 			     struct ast_vbios_mode_info *vbios_mode)
 {
 	struct ast_private *ast = dev->dev_private;
-	struct ast_vbios_dclk_info *clk_info;
+	const struct ast_vbios_dclk_info *clk_info;
 
-	clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];
+	if (ast->chip == AST2500)
+		clk_info = &dclk_table_ast2500[vbios_mode->enh_table->dclk_index];
+	else
+		clk_info = &dclk_table[vbios_mode->enh_table->dclk_index];
 
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xc0, 0x00, clk_info->param1);
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xc1, 0x00, clk_info->param2);
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xbb, 0x0f,
-			       (clk_info->param3 & 0x80) | ((clk_info->param3 & 0x3) << 4));
+			       (clk_info->param3 & 0xc0) |
+			       ((clk_info->param3 & 0x3) << 4));
 }
 
 static void ast_set_ext_reg(struct drm_crtc *crtc, struct drm_display_mode *mode,
@@ -425,7 +438,8 @@ static void ast_set_ext_reg(struct drm_crtc *crtc, struct drm_display_mode *mode
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa8, 0xfd, jregA8);
 
 	/* Set Threshold */
-	if (ast->chip == AST2300 || ast->chip == AST2400) {
+	if (ast->chip == AST2300 || ast->chip == AST2400 ||
+	    ast->chip == AST2500) {
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa7, 0x78);
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa6, 0x60);
 	} else if (ast->chip == AST2100 ||
@@ -800,7 +814,9 @@ static int ast_mode_valid(struct drm_connector *connector,
 		if ((mode->hdisplay == 1600) && (mode->vdisplay == 900))
 			return MODE_OK;
 
-		if ((ast->chip == AST2100) || (ast->chip == AST2200) || (ast->chip == AST2300) || (ast->chip == AST2400) || (ast->chip == AST1180)) {
+		if ((ast->chip == AST2100) || (ast->chip == AST2200) ||
+		    (ast->chip == AST2300) || (ast->chip == AST2400) ||
+		    (ast->chip == AST2500) || (ast->chip == AST1180)) {
 			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1080))
 				return MODE_OK;
 
diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index 5331ee1df086e7ae3950e33efc38975b544abdd4..f7d421359d564756ff86d78c64293e37eea74c7e 100644
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -31,7 +31,8 @@
 
 #include "ast_dram_tables.h"
 
-static void ast_init_dram_2300(struct drm_device *dev);
+static void ast_post_chip_2300(struct drm_device *dev);
+static void ast_post_chip_2500(struct drm_device *dev);
 
 void ast_enable_vga(struct drm_device *dev)
 {
@@ -58,13 +59,9 @@ bool ast_is_vga_enabled(struct drm_device *dev)
 		/* TODO 1180 */
 	} else {
 		ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
-		if (ch) {
-			ast_open_key(ast);
-			ch = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff);
-			return ch & 0x04;
-		}
+		return !!(ch & 0x01);
 	}
-	return 0;
+	return false;
 }
 
 static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };
@@ -79,10 +76,11 @@ ast_set_def_ext_reg(struct drm_device *dev)
 	const u8 *ext_reg_info;
 
 	/* reset scratch */
-	for (i = 0x81; i <= 0x8f; i++)
+	for (i = 0x81; i <= 0x9f; i++)
 		ast_set_index_reg(ast, AST_IO_CRTC_PORT, i, 0x00);
 
-	if (ast->chip == AST2300 || ast->chip == AST2400) {
+	if (ast->chip == AST2300 || ast->chip == AST2400 ||
+	    ast->chip == AST2500) {
 		if (dev->pdev->revision >= 0x20)
 			ext_reg_info = extreginfo_ast2300;
 		else
@@ -106,7 +104,8 @@ ast_set_def_ext_reg(struct drm_device *dev)
 
 	/* Enable RAMDAC for A1 */
 	reg = 0x04;
-	if (ast->chip == AST2300 || ast->chip == AST2400)
+	if (ast->chip == AST2300 || ast->chip == AST2400 ||
+	    ast->chip == AST2500)
 		reg |= 0x20;
 	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xff, reg);
 }
@@ -375,21 +374,20 @@ void ast_post_gpu(struct drm_device *dev)
 	pci_write_config_dword(ast->dev->pdev, 0x04, reg);
 
 	ast_enable_vga(dev);
-	ast_enable_mmio(dev);
 	ast_open_key(ast);
+	ast_enable_mmio(dev);
 	ast_set_def_ext_reg(dev);
 
-	if (ast->DisableP2A == false)
-	{
-		if (ast->chip == AST2300 || ast->chip == AST2400)
-			ast_init_dram_2300(dev);
+	if (ast->config_mode == ast_use_p2a) {
+		if (ast->chip == AST2500)
+			ast_post_chip_2500(dev);
+		else if (ast->chip == AST2300 || ast->chip == AST2400)
+			ast_post_chip_2300(dev);
 		else
 			ast_init_dram_reg(dev);
 
 		ast_init_3rdtx(dev);
-	}
-	else
-	{
+	} else {
 		if (ast->tx_chip_type != AST_TX_NONE)
 			ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xcf, 0x80);	/* Enable DVO */
 	}
@@ -448,85 +446,70 @@ static const u32 pattern[8] = {
 	0x7C61D253
 };
 
-static int mmc_test_burst(struct ast_private *ast, u32 datagen)
+static bool mmc_test(struct ast_private *ast, u32 datagen, u8 test_ctl)
 {
 	u32 data, timeout;
 
 	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-	ast_moutdwm(ast, 0x1e6e0070, 0x000000c1 | (datagen << 3));
+	ast_moutdwm(ast, 0x1e6e0070, (datagen << 3) | test_ctl);
 	timeout = 0;
 	do {
 		data = ast_mindwm(ast, 0x1e6e0070) & 0x3000;
-		if (data & 0x2000) {
-			return 0;
-		}
+		if (data & 0x2000)
+			return false;
 		if (++timeout > TIMEOUT) {
 			ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-			return 0;
+			return false;
 		}
 	} while (!data);
-	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-	return 1;
+	ast_moutdwm(ast, 0x1e6e0070, 0x0);
+	return true;
 }
 
-static int mmc_test_burst2(struct ast_private *ast, u32 datagen)
+static u32 mmc_test2(struct ast_private *ast, u32 datagen, u8 test_ctl)
 {
 	u32 data, timeout;
 
 	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-	ast_moutdwm(ast, 0x1e6e0070, 0x00000041 | (datagen << 3));
+	ast_moutdwm(ast, 0x1e6e0070, (datagen << 3) | test_ctl);
 	timeout = 0;
 	do {
 		data = ast_mindwm(ast, 0x1e6e0070) & 0x1000;
 		if (++timeout > TIMEOUT) {
 			ast_moutdwm(ast, 0x1e6e0070, 0x0);
-			return -1;
+			return 0xffffffff;
 		}
 	} while (!data);
 	data = ast_mindwm(ast, 0x1e6e0078);
 	data = (data | (data >> 16)) & 0xffff;
-	ast_moutdwm(ast, 0x1e6e0070, 0x0);
+	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
 	return data;
 }
 
-static int mmc_test_single(struct ast_private *ast, u32 datagen)
+
+static bool mmc_test_burst(struct ast_private *ast, u32 datagen)
 {
-	u32 data, timeout;
+	return mmc_test(ast, datagen, 0xc1);
+}
 
-	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-	ast_moutdwm(ast, 0x1e6e0070, 0x000000c5 | (datagen << 3));
-	timeout = 0;
-	do {
-		data = ast_mindwm(ast, 0x1e6e0070) & 0x3000;
-		if (data & 0x2000)
-			return 0;
-		if (++timeout > TIMEOUT) {
-			ast_moutdwm(ast, 0x1e6e0070, 0x0);
-			return 0;
-		}
-	} while (!data);
-	ast_moutdwm(ast, 0x1e6e0070, 0x0);
-	return 1;
+static u32 mmc_test_burst2(struct ast_private *ast, u32 datagen)
+{
+	return mmc_test2(ast, datagen, 0x41);
 }
 
-static int mmc_test_single2(struct ast_private *ast, u32 datagen)
+static bool mmc_test_single(struct ast_private *ast, u32 datagen)
 {
-	u32 data, timeout;
+	return mmc_test(ast, datagen, 0xc5);
+}
 
-	ast_moutdwm(ast, 0x1e6e0070, 0x00000000);
-	ast_moutdwm(ast, 0x1e6e0070, 0x00000005 | (datagen << 3));
-	timeout = 0;
-	do {
-		data = ast_mindwm(ast, 0x1e6e0070) & 0x1000;
-		if (++timeout > TIMEOUT) {
-			ast_moutdwm(ast, 0x1e6e0070, 0x0);
-			return -1;
-		}
-	} while (!data);
-	data = ast_mindwm(ast, 0x1e6e0078);
-	data = (data | (data >> 16)) & 0xffff;
-	ast_moutdwm(ast, 0x1e6e0070, 0x0);
-	return data;
+static u32 mmc_test_single2(struct ast_private *ast, u32 datagen)
+{
+	return mmc_test2(ast, datagen, 0x05);
+}
+
+static bool mmc_test_single_2500(struct ast_private *ast, u32 datagen)
+{
+	return mmc_test(ast, datagen, 0x85);
 }
 
 static int cbr_test(struct ast_private *ast)
@@ -604,16 +587,16 @@ static u32 cbr_scan2(struct ast_private *ast)
 	return data2;
 }
 
-static u32 cbr_test3(struct ast_private *ast)
+static bool cbr_test3(struct ast_private *ast)
 {
 	if (!mmc_test_burst(ast, 0))
-		return 0;
+		return false;
 	if (!mmc_test_single(ast, 0))
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
-static u32 cbr_scan3(struct ast_private *ast)
+static bool cbr_scan3(struct ast_private *ast)
 {
 	u32 patcnt, loop;
 
@@ -624,9 +607,9 @@ static u32 cbr_scan3(struct ast_private *ast)
 				break;
 		}
 		if (loop == 2)
-			return 0;
+			return false;
 	}
-	return 1;
+	return true;
 }
 
 static bool finetuneDQI_L(struct ast_private *ast, struct ast2300_dram_param *param)
@@ -1612,7 +1595,7 @@ static void ddr2_init(struct ast_private *ast, struct ast2300_dram_param *param)
 
 }
 
-static void ast_init_dram_2300(struct drm_device *dev)
+static void ast_post_chip_2300(struct drm_device *dev)
 {
 	struct ast_private *ast = dev->dev_private;
 	struct ast2300_dram_param param;
@@ -1638,12 +1621,44 @@ static void ast_init_dram_2300(struct drm_device *dev)
 		temp |= 0x73;
 		ast_write32(ast, 0x12008, temp);
 
+		param.dram_freq = 396;
 		param.dram_type = AST_DDR3;
+		temp = ast_mindwm(ast, 0x1e6e2070);
 		if (temp & 0x01000000)
 			param.dram_type = AST_DDR2;
-		param.dram_chipid = ast->dram_type;
-		param.dram_freq = ast->mclk;
-		param.vram_size = ast->vram_size;
+                switch (temp & 0x18000000) {
+		case 0:
+			param.dram_chipid = AST_DRAM_512Mx16;
+			break;
+		default:
+		case 0x08000000:
+			param.dram_chipid = AST_DRAM_1Gx16;
+			break;
+		case 0x10000000:
+			param.dram_chipid = AST_DRAM_2Gx16;
+			break;
+		case 0x18000000:
+			param.dram_chipid = AST_DRAM_4Gx16;
+			break;
+		}
+                switch (temp & 0x0c) {
+                default:
+		case 0x00:
+			param.vram_size = AST_VIDMEM_SIZE_8M;
+			break;
+
+		case 0x04:
+			param.vram_size = AST_VIDMEM_SIZE_16M;
+			break;
+
+		case 0x08:
+			param.vram_size = AST_VIDMEM_SIZE_32M;
+			break;
+
+		case 0x0c:
+			param.vram_size = AST_VIDMEM_SIZE_64M;
+			break;
+		}
 
 		if (param.dram_type == AST_DDR3) {
 			get_ddr3_info(ast, &param);
@@ -1663,3 +1678,404 @@ static void ast_init_dram_2300(struct drm_device *dev)
 	} while ((reg & 0x40) == 0);
 }
 
+static bool cbr_test_2500(struct ast_private *ast)
+{
+	ast_moutdwm(ast, 0x1E6E0074, 0x0000FFFF);
+	ast_moutdwm(ast, 0x1E6E007C, 0xFF00FF00);
+	if (!mmc_test_burst(ast, 0))
+		return false;
+	if (!mmc_test_single_2500(ast, 0))
+		return false;
+	return true;
+}
+
+static bool ddr_test_2500(struct ast_private *ast)
+{
+	ast_moutdwm(ast, 0x1E6E0074, 0x0000FFFF);
+	ast_moutdwm(ast, 0x1E6E007C, 0xFF00FF00);
+	if (!mmc_test_burst(ast, 0))
+		return false;
+	if (!mmc_test_burst(ast, 1))
+		return false;
+	if (!mmc_test_burst(ast, 2))
+		return false;
+	if (!mmc_test_burst(ast, 3))
+		return false;
+	if (!mmc_test_single_2500(ast, 0))
+		return false;
+	return true;
+}
+
+static void ddr_init_common_2500(struct ast_private *ast)
+{
+	ast_moutdwm(ast, 0x1E6E0034, 0x00020080);
+	ast_moutdwm(ast, 0x1E6E0008, 0x2003000F);
+	ast_moutdwm(ast, 0x1E6E0038, 0x00000FFF);
+	ast_moutdwm(ast, 0x1E6E0040, 0x88448844);
+	ast_moutdwm(ast, 0x1E6E0044, 0x24422288);
+	ast_moutdwm(ast, 0x1E6E0048, 0x22222222);
+	ast_moutdwm(ast, 0x1E6E004C, 0x22222222);
+	ast_moutdwm(ast, 0x1E6E0050, 0x80000000);
+	ast_moutdwm(ast, 0x1E6E0208, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0218, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0220, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0228, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0230, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E02A8, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E02B0, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0240, 0x86000000);
+	ast_moutdwm(ast, 0x1E6E0244, 0x00008600);
+	ast_moutdwm(ast, 0x1E6E0248, 0x80000000);
+	ast_moutdwm(ast, 0x1E6E024C, 0x80808080);
+}
+
+static void ddr_phy_init_2500(struct ast_private *ast)
+{
+	u32 data, pass, timecnt;
+
+	pass = 0;
+	ast_moutdwm(ast, 0x1E6E0060, 0x00000005);
+	while (!pass) {
+		for (timecnt = 0; timecnt < TIMEOUT; timecnt++) {
+			data = ast_mindwm(ast, 0x1E6E0060) & 0x1;
+			if (!data)
+				break;
+		}
+		if (timecnt != TIMEOUT) {
+			data = ast_mindwm(ast, 0x1E6E0300) & 0x000A0000;
+			if (!data)
+				pass = 1;
+		}
+		if (!pass) {
+			ast_moutdwm(ast, 0x1E6E0060, 0x00000000);
+			udelay(10); /* delay 10 us */
+			ast_moutdwm(ast, 0x1E6E0060, 0x00000005);
+		}
+	}
+
+	ast_moutdwm(ast, 0x1E6E0060, 0x00000006);
+}
+
+/*
+ * Check DRAM Size
+ * 1Gb : 0x80000000 ~ 0x87FFFFFF
+ * 2Gb : 0x80000000 ~ 0x8FFFFFFF
+ * 4Gb : 0x80000000 ~ 0x9FFFFFFF
+ * 8Gb : 0x80000000 ~ 0xBFFFFFFF
+ */
+static void check_dram_size_2500(struct ast_private *ast, u32 tRFC)
+{
+	u32 reg_04, reg_14;
+
+	reg_04 = ast_mindwm(ast, 0x1E6E0004) & 0xfffffffc;
+	reg_14 = ast_mindwm(ast, 0x1E6E0014) & 0xffffff00;
+
+	ast_moutdwm(ast, 0xA0100000, 0x41424344);
+	ast_moutdwm(ast, 0x90100000, 0x35363738);
+	ast_moutdwm(ast, 0x88100000, 0x292A2B2C);
+	ast_moutdwm(ast, 0x80100000, 0x1D1E1F10);
+
+	/* Check 8Gbit */
+	if (ast_mindwm(ast, 0xA0100000) == 0x41424344) {
+		reg_04 |= 0x03;
+		reg_14 |= (tRFC >> 24) & 0xFF;
+		/* Check 4Gbit */
+	} else if (ast_mindwm(ast, 0x90100000) == 0x35363738) {
+		reg_04 |= 0x02;
+		reg_14 |= (tRFC >> 16) & 0xFF;
+		/* Check 2Gbit */
+	} else if (ast_mindwm(ast, 0x88100000) == 0x292A2B2C) {
+		reg_04 |= 0x01;
+		reg_14 |= (tRFC >> 8) & 0xFF;
+	} else {
+		reg_14 |= tRFC & 0xFF;
+	}
+	ast_moutdwm(ast, 0x1E6E0004, reg_04);
+	ast_moutdwm(ast, 0x1E6E0014, reg_14);
+}
+
+static void enable_cache_2500(struct ast_private *ast)
+{
+	u32 reg_04, data;
+
+	reg_04 = ast_mindwm(ast, 0x1E6E0004);
+	ast_moutdwm(ast, 0x1E6E0004, reg_04 | 0x1000);
+
+	do
+		data = ast_mindwm(ast, 0x1E6E0004);
+	while (!(data & 0x80000));
+	ast_moutdwm(ast, 0x1E6E0004, reg_04 | 0x400);
+}
+
+static void set_mpll_2500(struct ast_private *ast)
+{
+	u32 addr, data, param;
+
+	/* Reset MMC */
+	ast_moutdwm(ast, 0x1E6E0000, 0xFC600309);
+	ast_moutdwm(ast, 0x1E6E0034, 0x00020080);
+	for (addr = 0x1e6e0004; addr < 0x1e6e0090;) {
+		ast_moutdwm(ast, addr, 0x0);
+		addr += 4;
+	}
+	ast_moutdwm(ast, 0x1E6E0034, 0x00020000);
+
+	ast_moutdwm(ast, 0x1E6E2000, 0x1688A8A8);
+	data = ast_mindwm(ast, 0x1E6E2070) & 0x00800000;
+	if (data) {
+		/* CLKIN = 25MHz */
+		param = 0x930023E0;
+		ast_moutdwm(ast, 0x1E6E2160, 0x00011320);
+	} else {
+		/* CLKIN = 24MHz */
+		param = 0x93002400;
+	}
+	ast_moutdwm(ast, 0x1E6E2020, param);
+	udelay(100);
+}
+
+static void reset_mmc_2500(struct ast_private *ast)
+{
+	ast_moutdwm(ast, 0x1E78505C, 0x00000004);
+	ast_moutdwm(ast, 0x1E785044, 0x00000001);
+	ast_moutdwm(ast, 0x1E785048, 0x00004755);
+	ast_moutdwm(ast, 0x1E78504C, 0x00000013);
+	mdelay(100);
+	ast_moutdwm(ast, 0x1E785054, 0x00000077);
+	ast_moutdwm(ast, 0x1E6E0000, 0xFC600309);
+}
+
+static void ddr3_init_2500(struct ast_private *ast, const u32 *ddr_table)
+{
+
+	ast_moutdwm(ast, 0x1E6E0004, 0x00000303);
+	ast_moutdwm(ast, 0x1E6E0010, ddr_table[REGIDX_010]);
+	ast_moutdwm(ast, 0x1E6E0014, ddr_table[REGIDX_014]);
+	ast_moutdwm(ast, 0x1E6E0018, ddr_table[REGIDX_018]);
+	ast_moutdwm(ast, 0x1E6E0020, ddr_table[REGIDX_020]);	     /* MODEREG4/6 */
+	ast_moutdwm(ast, 0x1E6E0024, ddr_table[REGIDX_024]);	     /* MODEREG5 */
+	ast_moutdwm(ast, 0x1E6E002C, ddr_table[REGIDX_02C] | 0x100); /* MODEREG0/2 */
+	ast_moutdwm(ast, 0x1E6E0030, ddr_table[REGIDX_030]);	     /* MODEREG1/3 */
+
+	/* DDR PHY Setting */
+	ast_moutdwm(ast, 0x1E6E0200, 0x02492AAE);
+	ast_moutdwm(ast, 0x1E6E0204, 0x00001001);
+	ast_moutdwm(ast, 0x1E6E020C, 0x55E00B0B);
+	ast_moutdwm(ast, 0x1E6E0210, 0x20000000);
+	ast_moutdwm(ast, 0x1E6E0214, ddr_table[REGIDX_214]);
+	ast_moutdwm(ast, 0x1E6E02E0, ddr_table[REGIDX_2E0]);
+	ast_moutdwm(ast, 0x1E6E02E4, ddr_table[REGIDX_2E4]);
+	ast_moutdwm(ast, 0x1E6E02E8, ddr_table[REGIDX_2E8]);
+	ast_moutdwm(ast, 0x1E6E02EC, ddr_table[REGIDX_2EC]);
+	ast_moutdwm(ast, 0x1E6E02F0, ddr_table[REGIDX_2F0]);
+	ast_moutdwm(ast, 0x1E6E02F4, ddr_table[REGIDX_2F4]);
+	ast_moutdwm(ast, 0x1E6E02F8, ddr_table[REGIDX_2F8]);
+	ast_moutdwm(ast, 0x1E6E0290, 0x00100008);
+	ast_moutdwm(ast, 0x1E6E02C0, 0x00000006);
+
+	/* Controller Setting */
+	ast_moutdwm(ast, 0x1E6E0034, 0x00020091);
+
+	/* Wait DDR PHY init done */
+	ddr_phy_init_2500(ast);
+
+	ast_moutdwm(ast, 0x1E6E0120, ddr_table[REGIDX_PLL]);
+	ast_moutdwm(ast, 0x1E6E000C, 0x42AA5C81);
+	ast_moutdwm(ast, 0x1E6E0034, 0x0001AF93);
+
+	check_dram_size_2500(ast, ddr_table[REGIDX_RFC]);
+	enable_cache_2500(ast);
+	ast_moutdwm(ast, 0x1E6E001C, 0x00000008);
+	ast_moutdwm(ast, 0x1E6E0038, 0xFFFFFF00);
+}
+
+static void ddr4_init_2500(struct ast_private *ast, const u32 *ddr_table)
+{
+	u32 data, data2, pass, retrycnt;
+	u32 ddr_vref, phy_vref;
+	u32 min_ddr_vref = 0, min_phy_vref = 0;
+	u32 max_ddr_vref = 0, max_phy_vref = 0;
+
+	ast_moutdwm(ast, 0x1E6E0004, 0x00000313);
+	ast_moutdwm(ast, 0x1E6E0010, ddr_table[REGIDX_010]);
+	ast_moutdwm(ast, 0x1E6E0014, ddr_table[REGIDX_014]);
+	ast_moutdwm(ast, 0x1E6E0018, ddr_table[REGIDX_018]);
+	ast_moutdwm(ast, 0x1E6E0020, ddr_table[REGIDX_020]);	     /* MODEREG4/6 */
+	ast_moutdwm(ast, 0x1E6E0024, ddr_table[REGIDX_024]);	     /* MODEREG5 */
+	ast_moutdwm(ast, 0x1E6E002C, ddr_table[REGIDX_02C] | 0x100); /* MODEREG0/2 */
+	ast_moutdwm(ast, 0x1E6E0030, ddr_table[REGIDX_030]);	     /* MODEREG1/3 */
+
+	/* DDR PHY Setting */
+	ast_moutdwm(ast, 0x1E6E0200, 0x42492AAE);
+	ast_moutdwm(ast, 0x1E6E0204, 0x09002000);
+	ast_moutdwm(ast, 0x1E6E020C, 0x55E00B0B);
+	ast_moutdwm(ast, 0x1E6E0210, 0x20000000);
+	ast_moutdwm(ast, 0x1E6E0214, ddr_table[REGIDX_214]);
+	ast_moutdwm(ast, 0x1E6E02E0, ddr_table[REGIDX_2E0]);
+	ast_moutdwm(ast, 0x1E6E02E4, ddr_table[REGIDX_2E4]);
+	ast_moutdwm(ast, 0x1E6E02E8, ddr_table[REGIDX_2E8]);
+	ast_moutdwm(ast, 0x1E6E02EC, ddr_table[REGIDX_2EC]);
+	ast_moutdwm(ast, 0x1E6E02F0, ddr_table[REGIDX_2F0]);
+	ast_moutdwm(ast, 0x1E6E02F4, ddr_table[REGIDX_2F4]);
+	ast_moutdwm(ast, 0x1E6E02F8, ddr_table[REGIDX_2F8]);
+	ast_moutdwm(ast, 0x1E6E0290, 0x00100008);
+	ast_moutdwm(ast, 0x1E6E02C4, 0x3C183C3C);
+	ast_moutdwm(ast, 0x1E6E02C8, 0x00631E0E);
+
+	/* Controller Setting */
+	ast_moutdwm(ast, 0x1E6E0034, 0x0001A991);
+
+	/* Train PHY Vref first */
+	pass = 0;
+
+	for (retrycnt = 0; retrycnt < 4 && pass == 0; retrycnt++) {
+		max_phy_vref = 0x0;
+		pass = 0;
+		ast_moutdwm(ast, 0x1E6E02C0, 0x00001C06);
+		for (phy_vref = 0x40; phy_vref < 0x80; phy_vref++) {
+			ast_moutdwm(ast, 0x1E6E000C, 0x00000000);
+			ast_moutdwm(ast, 0x1E6E0060, 0x00000000);
+			ast_moutdwm(ast, 0x1E6E02CC, phy_vref | (phy_vref << 8));
+			/* Fire DFI Init */
+			ddr_phy_init_2500(ast);
+			ast_moutdwm(ast, 0x1E6E000C, 0x00005C01);
+			if (cbr_test_2500(ast)) {
+				pass++;
+				data = ast_mindwm(ast, 0x1E6E03D0);
+				data2 = data >> 8;
+				data  = data & 0xff;
+				if (data > data2)
+					data = data2;
+				if (max_phy_vref < data) {
+					max_phy_vref = data;
+					min_phy_vref = phy_vref;
+				}
+			} else if (pass > 0)
+				break;
+		}
+	}
+	ast_moutdwm(ast, 0x1E6E02CC, min_phy_vref | (min_phy_vref << 8));
+
+	/* Train DDR Vref next */
+	pass = 0;
+
+	for (retrycnt = 0; retrycnt < 4 && pass == 0; retrycnt++) {
+		min_ddr_vref = 0xFF;
+		max_ddr_vref = 0x0;
+		pass = 0;
+		for (ddr_vref = 0x00; ddr_vref < 0x40; ddr_vref++) {
+			ast_moutdwm(ast, 0x1E6E000C, 0x00000000);
+			ast_moutdwm(ast, 0x1E6E0060, 0x00000000);
+			ast_moutdwm(ast, 0x1E6E02C0, 0x00000006 | (ddr_vref << 8));
+			/* Fire DFI Init */
+			ddr_phy_init_2500(ast);
+			ast_moutdwm(ast, 0x1E6E000C, 0x00005C01);
+			if (cbr_test_2500(ast)) {
+				pass++;
+				if (min_ddr_vref > ddr_vref)
+					min_ddr_vref = ddr_vref;
+				if (max_ddr_vref < ddr_vref)
+					max_ddr_vref = ddr_vref;
+			} else if (pass != 0)
+				break;
+		}
+	}
+
+	ast_moutdwm(ast, 0x1E6E000C, 0x00000000);
+	ast_moutdwm(ast, 0x1E6E0060, 0x00000000);
+	ddr_vref = (min_ddr_vref + max_ddr_vref + 1) >> 1;
+	ast_moutdwm(ast, 0x1E6E02C0, 0x00000006 | (ddr_vref << 8));
+
+	/* Wait DDR PHY init done */
+	ddr_phy_init_2500(ast);
+
+	ast_moutdwm(ast, 0x1E6E0120, ddr_table[REGIDX_PLL]);
+	ast_moutdwm(ast, 0x1E6E000C, 0x42AA5C81);
+	ast_moutdwm(ast, 0x1E6E0034, 0x0001AF93);
+
+	check_dram_size_2500(ast, ddr_table[REGIDX_RFC]);
+	enable_cache_2500(ast);
+	ast_moutdwm(ast, 0x1E6E001C, 0x00000008);
+	ast_moutdwm(ast, 0x1E6E0038, 0xFFFFFF00);
+}
+
+static bool ast_dram_init_2500(struct ast_private *ast)
+{
+	u32 data;
+	u32 max_tries = 5;
+
+	do {
+		if (max_tries-- == 0)
+			return false;
+		set_mpll_2500(ast);
+		reset_mmc_2500(ast);
+		ddr_init_common_2500(ast);
+
+		data = ast_mindwm(ast, 0x1E6E2070);
+		if (data & 0x01000000)
+			ddr4_init_2500(ast, ast2500_ddr4_1600_timing_table);
+		else
+			ddr3_init_2500(ast, ast2500_ddr3_1600_timing_table);
+	} while (!ddr_test_2500(ast));
+
+	ast_moutdwm(ast, 0x1E6E2040, ast_mindwm(ast, 0x1E6E2040) | 0x41);
+
+	/* Patch code */
+	data = ast_mindwm(ast, 0x1E6E200C) & 0xF9FFFFFF;
+	ast_moutdwm(ast, 0x1E6E200C, data | 0x10000000);
+
+	return true;
+}
+
+void ast_post_chip_2500(struct drm_device *dev)
+{
+	struct ast_private *ast = dev->dev_private;
+	u32 temp;
+	u8 reg;
+
+	reg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
+	if ((reg & 0x80) == 0) {/* vga only */
+		/* Clear bus lock condition */
+		ast_moutdwm(ast, 0x1e600000, 0xAEED1A03);
+		ast_moutdwm(ast, 0x1e600084, 0x00010000);
+		ast_moutdwm(ast, 0x1e600088, 0x00000000);
+		ast_moutdwm(ast, 0x1e6e2000, 0x1688A8A8);
+		ast_write32(ast, 0xf004, 0x1e6e0000);
+		ast_write32(ast, 0xf000, 0x1);
+		ast_write32(ast, 0x12000, 0x1688a8a8);
+		while (ast_read32(ast, 0x12000) != 0x1)
+			;
+
+		ast_write32(ast, 0x10000, 0xfc600309);
+		while (ast_read32(ast, 0x10000) != 0x1)
+			;
+
+		/* Slow down CPU/AHB CLK in VGA only mode */
+		temp = ast_read32(ast, 0x12008);
+		temp |= 0x73;
+		ast_write32(ast, 0x12008, temp);
+
+		/* Reset USB port to patch USB unknown device issue */
+		ast_moutdwm(ast, 0x1e6e2090, 0x20000000);
+		temp  = ast_mindwm(ast, 0x1e6e2094);
+		temp |= 0x00004000;
+		ast_moutdwm(ast, 0x1e6e2094, temp);
+		temp  = ast_mindwm(ast, 0x1e6e2070);
+		if (temp & 0x00800000) {
+			ast_moutdwm(ast, 0x1e6e207c, 0x00800000);
+			mdelay(100);
+			ast_moutdwm(ast, 0x1e6e2070, 0x00800000);
+		}
+
+		if (!ast_dram_init_2500(ast))
+			DRM_ERROR("DRAM init failed !\n");
+
+		temp = ast_mindwm(ast, 0x1e6e2040);
+		ast_moutdwm(ast, 0x1e6e2040, temp | 0x40);
+	}
+
+	/* wait ready */
+	do {
+		reg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
+	} while ((reg & 0x40) == 0);
+}
diff --git a/drivers/gpu/drm/ast/ast_tables.h b/drivers/gpu/drm/ast/ast_tables.h
index 3608d5aa7451a458a07fcfe3199ce3984108992b..5f4c2e833a650dd6be2e6afb5e9835cf7e434e17 100644
--- a/drivers/gpu/drm/ast/ast_tables.h
+++ b/drivers/gpu/drm/ast/ast_tables.h
@@ -47,6 +47,7 @@
 #define SyncPN			(PVSync | NHSync)
 #define SyncNP			(NVSync | PHSync)
 #define SyncNN			(NVSync | NHSync)
+#define AST2500PreCatchCRT		0x00004000
 
 /* DCLK Index */
 #define VCLK25_175     		0x00
@@ -78,37 +79,67 @@
 #define VCLK97_75     		0x19
 #define VCLK118_25			0x1A
 
-static struct ast_vbios_dclk_info dclk_table[] = {
-	{0x2C, 0xE7, 0x03},					/* 00: VCLK25_175	*/
-	{0x95, 0x62, 0x03},				        /* 01: VCLK28_322	*/
-	{0x67, 0x63, 0x01},				        /* 02: VCLK31_5         */
-	{0x76, 0x63, 0x01},				        /* 03: VCLK36         	*/
-	{0xEE, 0x67, 0x01},				        /* 04: VCLK40          	*/
-	{0x82, 0x62, 0x01}, 			        /* 05: VCLK49_5        	*/
-	{0xC6, 0x64, 0x01},                        	        /* 06: VCLK50          	*/
-	{0x94, 0x62, 0x01},                        	        /* 07: VCLK56_25       	*/
-	{0x80, 0x64, 0x00},                        	        /* 08: VCLK65		*/
-	{0x7B, 0x63, 0x00},                        	        /* 09: VCLK75	        */
-	{0x67, 0x62, 0x00},				        /* 0A: VCLK78_75       	*/
-	{0x7C, 0x62, 0x00},                        	        /* 0B: VCLK94_5        	*/
-	{0x8E, 0x62, 0x00},                        	        /* 0C: VCLK108         	*/
-	{0x85, 0x24, 0x00},                        	        /* 0D: VCLK135         	*/
-	{0x67, 0x22, 0x00},                        	        /* 0E: VCLK157_5       	*/
-	{0x6A, 0x22, 0x00},				        /* 0F: VCLK162         	*/
-	{0x4d, 0x4c, 0x80},				        /* 10: VCLK154      	*/
-	{0xa7, 0x78, 0x80},					/* 11: VCLK83.5         */
-	{0x28, 0x49, 0x80},					/* 12: VCLK106.5        */
-	{0x37, 0x49, 0x80},					/* 13: VCLK146.25       */
-	{0x1f, 0x45, 0x80},					/* 14: VCLK148.5        */
-	{0x47, 0x6c, 0x80},					/* 15: VCLK71       */
-	{0x25, 0x65, 0x80},					/* 16: VCLK88.75    */
-	{0x77, 0x58, 0x80},					/* 17: VCLK119      */
-	{0x32, 0x67, 0x80},				    /* 18: VCLK85_5     */
-	{0x6a, 0x6d, 0x80},					/* 19: VCLK97_75	*/
-	{0x3b, 0x2c, 0x81},					/* 1A: VCLK118_25	*/
+static const struct ast_vbios_dclk_info dclk_table[] = {
+	{0x2C, 0xE7, 0x03},			/* 00: VCLK25_175	*/
+	{0x95, 0x62, 0x03},			/* 01: VCLK28_322	*/
+	{0x67, 0x63, 0x01},			/* 02: VCLK31_5		*/
+	{0x76, 0x63, 0x01},			/* 03: VCLK36		*/
+	{0xEE, 0x67, 0x01},			/* 04: VCLK40		*/
+	{0x82, 0x62, 0x01},			/* 05: VCLK49_5		*/
+	{0xC6, 0x64, 0x01},			/* 06: VCLK50		*/
+	{0x94, 0x62, 0x01},			/* 07: VCLK56_25	*/
+	{0x80, 0x64, 0x00},			/* 08: VCLK65		*/
+	{0x7B, 0x63, 0x00},			/* 09: VCLK75		*/
+	{0x67, 0x62, 0x00},			/* 0A: VCLK78_75	*/
+	{0x7C, 0x62, 0x00},			/* 0B: VCLK94_5		*/
+	{0x8E, 0x62, 0x00},			/* 0C: VCLK108		*/
+	{0x85, 0x24, 0x00},			/* 0D: VCLK135		*/
+	{0x67, 0x22, 0x00},			/* 0E: VCLK157_5	*/
+	{0x6A, 0x22, 0x00},			/* 0F: VCLK162		*/
+	{0x4d, 0x4c, 0x80},			/* 10: VCLK154		*/
+	{0xa7, 0x78, 0x80},			/* 11: VCLK83.5		*/
+	{0x28, 0x49, 0x80},			/* 12: VCLK106.5	*/
+	{0x37, 0x49, 0x80},			/* 13: VCLK146.25	*/
+	{0x1f, 0x45, 0x80},			/* 14: VCLK148.5	*/
+	{0x47, 0x6c, 0x80},			/* 15: VCLK71		*/
+	{0x25, 0x65, 0x80},			/* 16: VCLK88.75	*/
+	{0x77, 0x58, 0x80},			/* 17: VCLK119		*/
+	{0x32, 0x67, 0x80},			/* 18: VCLK85_5		*/
+	{0x6a, 0x6d, 0x80},			/* 19: VCLK97_75	*/
+	{0x3b, 0x2c, 0x81},			/* 1A: VCLK118_25	*/
 };
 
-static struct ast_vbios_stdtable vbios_stdtable[] = {
+static const struct ast_vbios_dclk_info dclk_table_ast2500[] = {
+	{0x2C, 0xE7, 0x03},			/* 00: VCLK25_175	*/
+	{0x95, 0x62, 0x03},			/* 01: VCLK28_322	*/
+	{0x67, 0x63, 0x01},			/* 02: VCLK31_5		*/
+	{0x76, 0x63, 0x01},			/* 03: VCLK36		*/
+	{0xEE, 0x67, 0x01},			/* 04: VCLK40		*/
+	{0x82, 0x62, 0x01},			/* 05: VCLK49_5		*/
+	{0xC6, 0x64, 0x01},			/* 06: VCLK50		*/
+	{0x94, 0x62, 0x01},			/* 07: VCLK56_25	*/
+	{0x80, 0x64, 0x00},			/* 08: VCLK65		*/
+	{0x7B, 0x63, 0x00},			/* 09: VCLK75		*/
+	{0x67, 0x62, 0x00},			/* 0A: VCLK78_75	*/
+	{0x7C, 0x62, 0x00},			/* 0B: VCLK94_5		*/
+	{0x8E, 0x62, 0x00},			/* 0C: VCLK108		*/
+	{0x85, 0x24, 0x00},			/* 0D: VCLK135		*/
+	{0x67, 0x22, 0x00},			/* 0E: VCLK157_5	*/
+	{0x6A, 0x22, 0x00},			/* 0F: VCLK162		*/
+	{0x4d, 0x4c, 0x80},			/* 10: VCLK154		*/
+	{0xa7, 0x78, 0x80},			/* 11: VCLK83.5		*/
+	{0x28, 0x49, 0x80},			/* 12: VCLK106.5	*/
+	{0x37, 0x49, 0x80},			/* 13: VCLK146.25	*/
+	{0x1f, 0x45, 0x80},			/* 14: VCLK148.5	*/
+	{0x47, 0x6c, 0x80},			/* 15: VCLK71		*/
+	{0x25, 0x65, 0x80},			/* 16: VCLK88.75	*/
+	{0x58, 0x01, 0x42},			/* 17: VCLK119		*/
+	{0x32, 0x67, 0x80},			/* 18: VCLK85_5		*/
+	{0x6a, 0x6d, 0x80},			/* 19: VCLK97_75	*/
+	{0x44, 0x20, 0x43},			/* 1A: VCLK118_25	*/
+};
+
+static const struct ast_vbios_stdtable vbios_stdtable[] = {
 	/* MD_2_3_400 */
 	{
 		0x67,
@@ -181,21 +212,21 @@ static struct ast_vbios_stdtable vbios_stdtable[] = {
 	},
 };
 
-static struct ast_vbios_enhtable res_640x480[] = {
+static const struct ast_vbios_enhtable res_640x480[] = {
 	{ 800, 640, 8, 96, 525, 480, 2, 2, VCLK25_175,	/* 60Hz */
 	  (SyncNN | HBorder | VBorder | Charx8Dot), 60, 1, 0x2E },
 	{ 832, 640, 16, 40, 520, 480, 1, 3, VCLK31_5,	/* 72Hz */
 	  (SyncNN | HBorder | VBorder | Charx8Dot), 72, 2, 0x2E  },
 	{ 840, 640, 16, 64, 500, 480, 1, 3, VCLK31_5,	/* 75Hz */
 	  (SyncNN | Charx8Dot) , 75, 3, 0x2E },
-	{ 832, 640, 56, 56, 509, 480, 1, 3, VCLK36,		/* 85Hz */
+	{ 832, 640, 56, 56, 509, 480, 1, 3, VCLK36,	/* 85Hz */
 	  (SyncNN | Charx8Dot) , 85, 4, 0x2E },
-	{ 832, 640, 56, 56, 509, 480, 1, 3, VCLK36,		/* end */
+	{ 832, 640, 56, 56, 509, 480, 1, 3, VCLK36,	/* end */
 	  (SyncNN | Charx8Dot) , 0xFF, 4, 0x2E },
 };
 
-static struct ast_vbios_enhtable res_800x600[] = {
-	{1024, 800, 24, 72, 625, 600, 1, 2, VCLK36,		/* 56Hz */
+static const struct ast_vbios_enhtable res_800x600[] = {
+	{1024, 800, 24, 72, 625, 600, 1, 2, VCLK36,	/* 56Hz */
 	 (SyncPP | Charx8Dot), 56, 1, 0x30 },
 	{1056, 800, 40, 128, 628, 600, 1, 4, VCLK40,	/* 60Hz */
 	 (SyncPP | Charx8Dot), 60, 2, 0x30 },
@@ -210,7 +241,7 @@ static struct ast_vbios_enhtable res_800x600[] = {
 };
 
 
-static struct ast_vbios_enhtable res_1024x768[] = {
+static const struct ast_vbios_enhtable res_1024x768[] = {
 	{1344, 1024, 24, 136, 806, 768, 3, 6, VCLK65,	/* 60Hz */
 	 (SyncNN | Charx8Dot), 60, 1, 0x31 },
 	{1328, 1024, 24, 136, 806, 768, 3, 6, VCLK75,	/* 70Hz */
@@ -223,7 +254,7 @@ static struct ast_vbios_enhtable res_1024x768[] = {
 	 (SyncPP | Charx8Dot), 0xFF, 4, 0x31 },
 };
 
-static struct ast_vbios_enhtable res_1280x1024[] = {
+static const struct ast_vbios_enhtable res_1280x1024[] = {
 	{1688, 1280, 48, 112, 1066, 1024, 1, 3, VCLK108,	/* 60Hz */
 	 (SyncPP | Charx8Dot), 60, 1, 0x32 },
 	{1688, 1280, 16, 144, 1066, 1024, 1, 3, VCLK135,	/* 75Hz */
@@ -234,7 +265,7 @@ static struct ast_vbios_enhtable res_1280x1024[] = {
 	 (SyncPP | Charx8Dot), 0xFF, 3, 0x32 },
 };
 
-static struct ast_vbios_enhtable res_1600x1200[] = {
+static const struct ast_vbios_enhtable res_1600x1200[] = {
 	{2160, 1600, 64, 192, 1250, 1200, 1, 3, VCLK162,	/* 60Hz */
 	 (SyncPP | Charx8Dot), 60, 1, 0x33 },
 	{2160, 1600, 64, 192, 1250, 1200, 1, 3, VCLK162,	/* end */
@@ -242,34 +273,39 @@ static struct ast_vbios_enhtable res_1600x1200[] = {
 };
 
 /* 16:9 */
-static struct ast_vbios_enhtable res_1360x768[] = {
-	{1792, 1360, 64,112, 795,  768, 3, 6, VCLK85_5,	         /* 60Hz */
+static const struct ast_vbios_enhtable res_1360x768[] = {
+	{1792, 1360, 64, 112, 795, 768, 3, 6, VCLK85_5,		/* 60Hz */
 	 (SyncPP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x39 },
-	{1792, 1360, 64,112, 795,  768, 3, 6, VCLK85_5,	         /* end */
-	 (SyncPP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 1, 0x39 },
+	{1792, 1360, 64, 112, 795, 768, 3, 6, VCLK85_5,	         /* end */
+	 (SyncPP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 0xFF, 1, 0x39 },
 };
 
-static struct ast_vbios_enhtable res_1600x900[] = {
-	{1760, 1600, 48, 32, 926,  900, 3, 5, VCLK97_75,	/* 60Hz CVT RB */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x3A },
-	{2112, 1600, 88,168, 934,  900, 3, 5, VCLK118_25,	/* 60Hz CVT */
+static const struct ast_vbios_enhtable res_1600x900[] = {
+	{1760, 1600, 48, 32, 926, 900, 3, 5, VCLK97_75,		/* 60Hz CVT RB */
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x3A },
+	{2112, 1600, 88, 168, 934, 900, 3, 5, VCLK118_25,	/* 60Hz CVT */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 2, 0x3A },
-	{2112, 1600, 88,168, 934,  900, 3, 5, VCLK118_25,	/* 60Hz CVT */
+	{2112, 1600, 88, 168, 934, 900, 3, 5, VCLK118_25,	/* 60Hz CVT */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 2, 0x3A },
 };
 
-static struct ast_vbios_enhtable res_1920x1080[] = {
+static const struct ast_vbios_enhtable res_1920x1080[] = {
 	{2200, 1920, 88, 44, 1125, 1080, 4, 5, VCLK148_5,	/* 60Hz */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x38 },
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x38 },
 	{2200, 1920, 88, 44, 1125, 1080, 4, 5, VCLK148_5,	/* 60Hz */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 1, 0x38 },
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 0xFF, 1, 0x38 },
 };
 
 
 /* 16:10 */
-static struct ast_vbios_enhtable res_1280x800[] = {
-	{1440, 1280, 48, 32,  823,  800, 3, 6, VCLK71,	/* 60Hz RB */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x35 },
+static const struct ast_vbios_enhtable res_1280x800[] = {
+	{1440, 1280, 48, 32,  823,  800, 3, 6, VCLK71,		/* 60Hz RB */
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x35 },
 	{1680, 1280, 72,128,  831,  800, 3, 6, VCLK83_5,	/* 60Hz */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 2, 0x35 },
 	{1680, 1280, 72,128,  831,  800, 3, 6, VCLK83_5,	/* 60Hz */
@@ -277,29 +313,33 @@ static struct ast_vbios_enhtable res_1280x800[] = {
 
 };
 
-static struct ast_vbios_enhtable res_1440x900[] = {
+static const struct ast_vbios_enhtable res_1440x900[] = {
 	{1600, 1440, 48, 32,  926,  900, 3, 6, VCLK88_75,	/* 60Hz RB */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x36 },
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x36 },
 	{1904, 1440, 80,152,  934,  900, 3, 6, VCLK106_5,	/* 60Hz */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 2, 0x36 },
 	{1904, 1440, 80,152,  934,  900, 3, 6, VCLK106_5,	/* 60Hz */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 2, 0x36 },
 };
 
-static struct ast_vbios_enhtable res_1680x1050[] = {
-	{1840, 1680, 48, 32, 1080, 1050, 3, 6, VCLK119,	/* 60Hz RB */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x37 },
+static const struct ast_vbios_enhtable res_1680x1050[] = {
+	{1840, 1680, 48, 32, 1080, 1050, 3, 6, VCLK119,		/* 60Hz RB */
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x37 },
 	{2240, 1680,104,176, 1089, 1050, 3, 6, VCLK146_25,	/* 60Hz */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 2, 0x37 },
 	{2240, 1680,104,176, 1089, 1050, 3, 6, VCLK146_25,	/* 60Hz */
 	 (SyncPN | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 2, 0x37 },
 };
 
-static struct ast_vbios_enhtable res_1920x1200[] = {
-	{2080, 1920, 48, 32, 1235, 1200, 3, 6, VCLK154,	/* 60Hz RB*/
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 60, 1, 0x34 },
-	{2080, 1920, 48, 32, 1235, 1200, 3, 6, VCLK154,	/* 60Hz RB */
-	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo), 0xFF, 1, 0x34 },
+static const struct ast_vbios_enhtable res_1920x1200[] = {
+	{2080, 1920, 48, 32, 1235, 1200, 3, 6, VCLK154,		/* 60Hz RB*/
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 60, 1, 0x34 },
+	{2080, 1920, 48, 32, 1235, 1200, 3, 6, VCLK154,		/* 60Hz RB */
+	 (SyncNP | Charx8Dot | LineCompareOff | WideScreenMode | NewModeInfo |
+	  AST2500PreCatchCRT), 0xFF, 1, 0x34 },
 };
 
 #endif