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>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/video/aty/radeon_monitor.c b/drivers/video/aty/radeon_monitor.c
index 9261c918fde8..5c23eac0eb9a 100644
--- 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
          */