radeonfb: Add quirk for the graphics adapter in some JSxx

These devices are set to 640x480 by firmware, switch them to 800x600@60
so that the graphical installer can run on remote console.

Reported by IBM during SLES10 SP2 beta testing:

https://bugzilla.novell.com/show_bug.cgi?id=461002
LTC50817

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/video/aty/radeon_monitor.c b/drivers/video/aty/radeon_monitor.c
index 9261c918fde87cc61712b993f93aae2f4dd28c84..5c23eac0eb9afe185b27ee871df22db61e78aa3b 100644 (file)
--- a/drivers/video/aty/radeon_monitor.c
+++ b/drivers/video/aty/radeon_monitor.c
@@ -730,6 +730,25 @@ static void radeon_videomode_to_var(struct fb_var_screeninfo *var,
        var->vmode = mode->vmode;
 }
 
+#ifdef CONFIG_PPC_PSERIES
+static int is_powerblade(const char *model)
+{
+       struct device_node *root;
+       const char* cp;
+       int len, l, rc = 0;
+
+       root = of_find_node_by_path("/");
+       if (root && model) {
+               l = strlen(model);
+               cp = of_get_property(root, "model", &len);
+               if (cp)
+                       rc = memcmp(model, cp, min(len, l)) == 0;
+               of_node_put(root);
+       }
+       return rc;
+}
+#endif
+
 /*
  * Build the modedb for head 1 (head 2 will come later), check panel infos
  * from either BIOS or EDID, and pick up the default mode
@@ -865,6 +884,22 @@ void __devinit radeon_check_modes(struct radeonfb_info *rinfo, const char *mode_
                        has_default_mode = 1;
        }
 
+#ifdef CONFIG_PPC_PSERIES
+       if (!has_default_mode && (
+               is_powerblade("IBM,8842") || /* JS20 */
+               is_powerblade("IBM,8844") || /* JS21 */
+               is_powerblade("IBM,7998") || /* JS12/JS21/JS22 */
+               is_powerblade("IBM,0792") || /* QS21 */
+               is_powerblade("IBM,0793")    /* QS22 */
+           )) {
+               printk("Falling back to 800x600 on JSxx hardware\n");
+               if (fb_find_mode(&info->var, info, "800x600@60",
+                                info->monspecs.modedb,
+                                info->monspecs.modedb_len, NULL, 8) != 0)
+                       has_default_mode = 1;
+       }
+#endif
+
        /*
         * Still no mode, let's pick up a default from the db
         */