vserver 1.9.5.x5

[linux-2.6.git] / drivers / video / aty / radeon_accel.c

diff --git a/drivers/video/aty/radeon_accel.c b/drivers/video/aty/radeon_accel.c
index e3883cf..dc8598d 100644 (file)
--- a/drivers/video/aty/radeon_accel.c
+++ b/drivers/video/aty/radeon_accel.c
@@ -4,6 +4,41 @@
  * "ACCEL_MMIO" ifdef branches in XFree86
  * --dte
  */
+
+static void radeon_fixup_offset(struct radeonfb_info *rinfo)
+{
+       u32 local_base;
+
+       /* *** Ugly workaround *** */
+       /*
+        * On some platforms, the video memory is mapped at 0 in radeon chip space
+        * (like PPCs) by the firmware. X will always move it up so that it's seen
+        * by the chip to be at the same address as the PCI BAR.
+        * That means that when switching back from X, there is a mismatch between
+        * the offsets programmed into the engine. This means that potentially,
+        * accel operations done before radeonfb has a chance to re-init the engine
+        * will have incorrect offsets, and potentially trash system memory !
+        *
+        * The correct fix is for fbcon to never call any accel op before the engine
+        * has properly been re-initialized (by a call to set_var), but this is a
+        * complex fix. This workaround in the meantime, called before every accel
+        * operation, makes sure the offsets are in sync.
+        */
+
+       radeon_fifo_wait (1);
+       local_base = INREG(MC_FB_LOCATION) << 16;
+       if (local_base == rinfo->fb_local_base)
+               return;
+
+       rinfo->fb_local_base = local_base;
+
+       radeon_fifo_wait (3);
+       OUTREG(DEFAULT_PITCH_OFFSET, (rinfo->pitch << 0x16) |
+                                    (rinfo->fb_local_base >> 10));
+       OUTREG(DST_PITCH_OFFSET, (rinfo->pitch << 0x16) | (rinfo->fb_local_base >> 10));
+       OUTREG(SRC_PITCH_OFFSET, (rinfo->pitch << 0x16) | (rinfo->fb_local_base >> 10));
+}
+
 static void radeonfb_prim_fillrect(struct radeonfb_info *rinfo, 
                                   const struct fb_fillrect *region)
 {
@@ -38,6 +73,8 @@ void radeonfb_fillrect(struct fb_info *info, const struct fb_fillrect *region)
                return;
        }
 
+       radeon_fixup_offset(rinfo);
+
        vxres = info->var.xres_virtual;
        vyres = info->var.yres_virtual;
 
@@ -105,6 +142,8 @@ void radeonfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
                return;
        }
 
+       radeon_fixup_offset(rinfo);
+
        vxres = info->var.xres_virtual;
        vyres = info->var.yres_virtual;