OLPC: gxfb/lxfb: add DCON panel modes to framebuffer drivers

Since there's no way to autodetect panel modes, we're forced to hardcode them
in the driver and add a big fat #ifdef. The OLPC DCON needs a specific mode
line (at 1200x900). This adds it to both gxfb and lxfb.

(Jordan said: We could probably detect the panel mode, but there isn't any
reason to since the panel timings are well known and won't change. While OFW
detection would be good computer science fu, it would be a wasted effort since
its so easy to hard code them into the table.)

Signed-off-by: Andres Salomon <[e-mail]>
Cc: Jordan Crouse <[e-mail]>
Cc: "Antonino A. Daplas" <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/geode/gxfb_core.c

···
 static int vt_switch;
 
 /* Modes relevant to the GX (taken from modedb.c) */
-static const struct fb_videomode gx_modedb[] __initdata = {
+static struct fb_videomode gx_modedb[] __initdata = {
 	/* 640x480-60 VESA */
 	{ NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
 	  0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
···
 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 	  FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 };
+
+#ifdef CONFIG_OLPC
+#include <asm/olpc.h>
+
+static struct fb_videomode gx_dcon_modedb[] __initdata = {
+	/* The only mode the DCON has is 1200x900 */
+	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, 0 }
+};
+
+static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
+{
+	if (olpc_has_dcon()) {
+		*modedb = (struct fb_videomode *) gx_dcon_modedb;
+		*size = ARRAY_SIZE(gx_dcon_modedb);
+	} else {
+		*modedb = (struct fb_videomode *) gx_modedb;
+		*size = ARRAY_SIZE(gx_modedb);
+	}
+}
+
+#else
+static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
+{
+	*modedb = (struct fb_videomode *) gx_modedb;
+	*size = ARRAY_SIZE(gx_modedb);
+}
+#endif
 
 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 {
···
 	int ret;
 	unsigned long val;
 
+	struct fb_videomode *modedb_ptr;
+	unsigned int modedb_size;
+
 	info = gxfb_init_fbinfo(&pdev->dev);
 	if (!info)
 		return -ENOMEM;
···
 	else
 		par->enable_crt = 1;
 
+	get_modedb(&modedb_ptr, &modedb_size);
 	ret = fb_find_mode(&info->var, info, mode_option,
-			   gx_modedb, ARRAY_SIZE(gx_modedb), NULL, 16);
+			   modedb_ptr, modedb_size, NULL, 16);
 	if (ret == 0 || ret == 4) {
 		dev_err(&pdev->dev, "could not find valid video mode\n");
 		ret = -EINVAL;

drivers/video/geode/lxfb_core.c

···
  * we try to make it something sane - 640x480-60 is sane
  */
 
-static const struct fb_videomode geode_modedb[] __initdata = {
+static struct fb_videomode geode_modedb[] __initdata = {
 	/* 640x480-60 */
 	{ NULL, 60, 640, 480, 39682, 48, 8, 25, 2, 88, 2,
 	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
···
 	{ NULL, 85, 1920, 1440, 2929, 368, 152, 68, 1, 216, 3,
 	  0, FB_VMODE_NONINTERLACED, 0 },
 };
+
+#ifdef CONFIG_OLPC
+#include <asm/olpc.h>
+
+static struct fb_videomode olpc_dcon_modedb[] __initdata = {
+	/* The only mode the DCON has is 1200x900 */
+	{ NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
+	  FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
+	  FB_VMODE_NONINTERLACED, 0 }
+};
+
+static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
+{
+	if (olpc_has_dcon()) {
+		*modedb = (struct fb_videomode *) olpc_dcon_modedb;
+		*size = ARRAY_SIZE(olpc_dcon_modedb);
+	} else {
+		*modedb = (struct fb_videomode *) geode_modedb;
+		*size = ARRAY_SIZE(geode_modedb);
+	}
+}
+
+#else
+static void __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
+{
+	*modedb = (struct fb_videomode *) geode_modedb;
+	*size = ARRAY_SIZE(geode_modedb);
+}
+#endif
 
 static int lxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 {
···
 	int ret;
 
 	struct fb_videomode *modedb_ptr;
-	int modedb_size;
+	unsigned int modedb_size;
 
 	info = lxfb_init_fbinfo(&pdev->dev);
 
···
 
 	/* Set up the mode database */
 
-	modedb_ptr = (struct fb_videomode *) geode_modedb;
-	modedb_size = ARRAY_SIZE(geode_modedb);
-
+	get_modedb(&modedb_ptr, &modedb_size);
 	ret = fb_find_mode(&info->var, info, mode_option,
 			   modedb_ptr, modedb_size, NULL, 16);