drm/ast: Add resolution support for 1152x864@75

Add 1152x864 into support list.
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220916085058.3386-1-jammy_huang@aspeedtech.com

drivers/gpu/drm/ast/ast_mode.c

@@ -113,6 +113,9 @@ static bool ast_get_vbios_mode_info(const struct drm_format_info *format,
 	case 1024:
 		vbios_mode->enh_table = &res_1024x768[refresh_rate_index];
 		break;
+	case 1152:
+		vbios_mode->enh_table = &res_1152x864[refresh_rate_index];
+		break;
 	case 1280:
 		if (mode->crtc_vdisplay == 800)
 			vbios_mode->enh_table = &res_1280x800[refresh_rate_index];
@@ -1057,6 +1060,8 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 			return MODE_OK;
 		if ((mode->hdisplay == 1600) && (mode->vdisplay == 900))
 			return MODE_OK;
+		if ((mode->hdisplay == 1152) && (mode->vdisplay == 864))
+			return MODE_OK;
 
 		if ((ast->chip == AST2100) || (ast->chip == AST2200) ||
 		    (ast->chip == AST2300) || (ast->chip == AST2400) ||
@@ -1089,6 +1094,10 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 		if (mode->vdisplay == 768)
 			status = MODE_OK;
 		break;
+	case 1152:
+		if (mode->vdisplay == 864)
+			status = MODE_OK;
+		break;
 	case 1280:
 		if (mode->vdisplay == 1024)
 			status = MODE_OK;

drivers/gpu/drm/ast/ast_tables.h

@@ -272,6 +272,13 @@ static const struct ast_vbios_enhtable res_1600x1200[] = {
 	 (SyncPP | Charx8Dot), 0xFF, 1, 0x33 },
 };
 
+static const struct ast_vbios_enhtable res_1152x864[] = {
+	{1600, 1152, 64, 128,  900,  864, 1, 3, VCLK108,	/* 75Hz */
+	 (SyncPP | Charx8Dot | NewModeInfo), 75, 1, 0x3B },
+	{1600, 1152, 64, 128,  900,  864, 1, 3, VCLK108,	/* end */
+	 (SyncPP | Charx8Dot | NewModeInfo), 0xFF, 1, 0x3B },
+};
+
 /* 16:9 */
 static const struct ast_vbios_enhtable res_1360x768[] = {
 	{1792, 1360, 64, 112, 795, 768, 3, 6, VCLK85_5,		/* 60Hz */