Change in libgfxinit[master]: gma: Always add rotated FB page mapping on y-tiling

[Nico Huber (Code Review)]

Nico Huber has uploaded this change for review. ( https://review.coreboot.org/c/libgfxinit/+/48825 )

Change subject: gma: Always add rotated FB page mapping on y-tiling
......................................................................

gma: Always add rotated FB page mapping on y-tiling

Y-tiling is usually only used to allow rotated framebuffers. If one
display is rotated but others aren't, we need a GTT mapping for each
case. To help with that, always map it both ways if y-tiling is used.

Change-Id: I934a36ba620d99108c7259fcaae13f92abf8cd64
Signed-off-by: Nico Huber 
---
M common/hw-gfx-gma.adb
1 file changed, 6 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/25/48825/1

diff --git a/common/hw-gfx-gma.adb b/common/hw-gfx-gma.adb
index 1c1ff6e..e2461a7 100644
--- a/common/hw-gfx-gma.adb
+++ b/common/hw-gfx-gma.adb
@@ -652,10 +652,11 @@
      (Valid_Stride (FB) and
       FB_First_Page (FB) in GTT_Range and
       FB_Last_Page (FB) + 256 in GTT_Range and
-      (not Rotation_90 (FB) or
+      (FB.Tiling /= Y_Tiled or
        (FB_First_Page (FB) mod 64 = 0 and
-        FB_Last_Page (FB) + 256 + GTT_Rotation_Offset in GTT_Range and
-        FB.Offset >= Word32 (GTT_Rotation_Offset) * GTT_Page_Size)));
+        FB_Last_Page (FB) + 256 + GTT_Rotation_Offset in GTT_Range)) and
+      (not Rotation_90 (FB) or
+        FB.Offset >= Word32 (GTT_Rotation_Offset) * GTT_Page_Size));

-- Also check that we don't overflow the GTT's 39-bit space
    -- (always true with a 32-bit base)
@@ -708,7 +709,7 @@
          Registers.Write_GTT (Idx, Phys_Addr, True);
       end loop;

-      if Rotation_90 (FB) and FB.Tiling = Y_Tiled and FB.V_Stride >= 32 then
+      if FB.Tiling = Y_Tiled and FB.V_Stride >= 32 then
          declare
             V_Pages : constant Natural := Natural (FB.V_Stride) / 32;
             Bytes_Per_Row : constant GTT_Address_Type :=
@@ -819,7 +820,7 @@
       Post => (if Valid then Valid_FB (FB))
    is
       GTT_Off : constant Natural :=
-         (if Rotation_90 (FB) then GTT_Rotation_Offset else 0);
+         (if FB.Tiling = Y_Tiled then GTT_Rotation_Offset else 0);

GTT_Size, Aperture_Size : Natural;
       Stolen_Size : Stolen_Size_Range;