commit 1b65b84bc2733675fa9233ece5943a5df6826b11
author Tim Wawrzynczak <twawrzynczak@chromium.org> Fri Sep 09 10:23:06 2022 -0600
committer Nico Huber <nico.h@gmx.de> Mon May 29 19:23:08 2023 +0000
tree 9f6c6357f78e6a8a0158af6d7184dba18f548129
parent 79a53797f70d218c049339ddce135be52e1b5d5b

gma: Update BDSM register offset for TGL onwards

BDSM moved and is also 64 bits on TGL. If the register indicates that
BSDM is 64-bits, then right now libgfxinit will error out.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I0a3e7a92dcb08ea33e08c9f2c5135d4269c9e0b9
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/65178
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>

common/hw-gfx-gma.adb

diff --git a/common/hw-gfx-gma.adb b/common/hw-gfx-gma.adb
index c66fa5d..83ded92 100644
--- a/common/hw-gfx-gma.adb
+++ b/common/hw-gfx-gma.adb
@@ -866,7 +866,6 @@
       Clear    : in     Boolean := True;
       Success  :    out Boolean)
    is
-      GMA_Phys_Base      : constant PCI.Index := 16#5c#;
       GMA_Phys_Base_Mask : constant := 16#fff0_0000#;
 
       Phys_Base : Word32;
@@ -874,7 +873,16 @@
       Validate_FB (FB, Success);
 
       if Success then
-         Dev.Read32 (Phys_Base, GMA_Phys_Base);
+         if Config.GMA_Base_Is_64bit then
+            Dev.Read32 (Phys_Base, Config.GMA_Phys_Base_Index + 4);
+            if Phys_Base /= 0 then
+               pragma Debug (Debug.Put_Line ("Cannot handle 64-bit DSM yet."));
+               Success := False;
+               return;
+            end if;
+         end if;
+
+         Dev.Read32 (Phys_Base, Config.GMA_Phys_Base_Index);
          Phys_Base := Phys_Base and GMA_Phys_Base_Mask;
          Success := Phys_Base /= GMA_Phys_Base_Mask and Phys_Base /= 0;
          pragma Debug (not Success, Debug.Put_Line