commit cb0ac57a4163fba7a3e73ff613670dc5792fb5b6
Author: schmitz <schmitz@michael.waratah.dyndns.org>
Date:   Sat Jul 14 15:26:25 2012 +1200

    [m68k] Atari: experimental truecolor support for atafb (ARAnyM only!)

diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c
index 64e41f5..71f9279 100644
--- a/drivers/video/atafb.c
+++ b/drivers/video/atafb.c
@@ -409,6 +409,7 @@ static char *vga16_names[] = { "vga16", "default3", NULL };
 static char *vga256_names[] = { "vga256", NULL };
 static char *falh2_names[] = { "falh2", NULL };
 static char *falh16_names[] = { "falh16", NULL };
+static char *truecol_names[] = { "truecolor", NULL };
 
 static char **fb_var_names[] = {
 	autodetect_names,
@@ -424,6 +425,7 @@ static char **fb_var_names[] = {
 	vga256_names,
 	falh2_names,
 	falh16_names,
+	truecol_names,
 	NULL
 };
 
@@ -483,6 +485,10 @@ static struct fb_var_screeninfo atafb_predefined[] = {
 	  896, 608, 896, 0, 0, 0, 4, 0,
 	  {0, 6, 0}, {0, 6, 0}, {0, 6, 0}, {0, 0, 0},
 	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
+	{ /* truecolor */
+	  640, 480, 640, 0, 0, 0, 16, 0,
+	  {0, 5, 0}, {0, 6, 0}, {0, 5, 0}, {0, 0, 0},
+	  0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, 0 },
 };
 
 static int num_atafb_predefined = ARRAY_SIZE(atafb_predefined);
@@ -547,6 +553,14 @@ static struct fb_videomode atafb_modedb[] __initdata = {
 		"falh", 60, 896, 608, 32000, 18, 42, 31, 1, 96,3,
 		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
 	},
+
+	{
+		/* 640x400, 31 kHz, 70 Hz (VGA) */
+		"truecolor", 70, 640, 400, 32000, 18, 42, 31, 11, 96, 3,
+		FB_SYNC_VERT_HIGH_ACT | FB_SYNC_COMP_HIGH_ACT, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	},
+
+
 };
 
 #define NUM_TOTAL_MODES  ARRAY_SIZE(atafb_modedb)
@@ -1181,8 +1195,13 @@ static int falcon_decode_var(struct fb_var_screeninfo *var,
 	}
 	/* Is video bus bandwidth (32MB/s) too low for this resolution? */
 	/* this is definitely wrong if bus clock != 32MHz */
-	if (pclock->f / plen / 8 * bpp > 32000000L)
-		return -EINVAL;
+	if (bpp == 16) {
+		if (pclock->f / plen / 16 * bpp > 32000000L)
+			return -EINVAL;
+	} else {
+		if (pclock->f / plen / 8 * bpp > 32000000L)
+			return -EINVAL;
+	}
 
 	if (vsync_len < 1)
 		vsync_len = 1;
@@ -3147,7 +3166,7 @@ int __init atafb_init(void)
 	/* Multisync monitor capabilities */
 	/* Atari-TOS defaults if no boot option present */
 	if (fb_info.monspecs.hfmin == 0) {
-		fb_info.monspecs.hfmin = 31000;
+		fb_info.monspecs.hfmin = 16000;
 		fb_info.monspecs.hfmax = 32000;
 		fb_info.monspecs.vfmin = 58;
 		fb_info.monspecs.vfmax = 62;