[PATCH] savagefb: Fix black screen on load in Savage IX

This is a hack that seems to kick start the 2D engine of the Savage IX in some
Toshiba laptops.  Without this, the laptop starts with a black screen and
occasionally crashes X.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/video/savage/savagefb_driver.c b/drivers/video/savage/savagefb_driver.c
index 4afa30522fdb..d952bf3199a6 100644
--- a/drivers/video/savage/savagefb_driver.c
+++ b/drivers/video/savage/savagefb_driver.c
@@ -384,6 +384,19 @@ SavageSetup2DEngine(struct savagefb_par  *par)
         BCI_SEND(0);
         BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD2);
         BCI_SEND(GlobalBitmapDescriptor);
+
+        /*
+         * I don't know why, sending this twice fixes the intial black screen,
+         * prevents X from crashing at least in Toshiba laptops with SavageIX.
+         * --Tony
+         */
+        par->bci_ptr = 0;
+        par->SavageWaitFifo(par, 4);
+
+        BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD1);
+        BCI_SEND(0);
+        BCI_SEND(BCI_CMD_SETREG | (1 << 16) | BCI_GBD2);
+        BCI_SEND(GlobalBitmapDescriptor);
 }
 
 static void savagefb_set_clip(struct fb_info *info)