commit fc49b60f2378c2dd649a4826cef58e63237fec63
author Tim Wawrzynczak <twawrzynczak@chromium.org> Fri Sep 09 10:29:24 2022 -0600
committer Nico Huber <nico.h@gmx.de> Sun Jun 04 12:12:26 2023 +0000
tree 5fb9fe9e540b63b8148d805f671a898d98ceb40a
parent 1b65b84bc2733675fa9233ece5943a5df6826b11

gma: Update PCH Rawclk programming for TGL

Tigerlake onwards needs the Rawclk numerator programmed into the
RAWCLK register in addition the fields from to prior generations.

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Iad36221a44db4128332392bd6610132ea08c0e35
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/67491
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-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 83ded92..cacafd3 100644
--- a/common/hw-gfx-gma.adb
+++ b/common/hw-gfx-gma.adb
@@ -97,8 +97,20 @@
 
    ----------------------------------------------------------------------------
 
-   PCH_RAWCLK_FREQ_MASK : constant :=
-     (if Config.Has_Fractional_RawClk then 16#3fff# * 2 ** 16 else 16#3ff# * 2 ** 0);
+   ICP_RAWCLK_NUM : constant := 1 * 2 ** 11;
+
+   function PCH_RAWCLK_FREQ_MASK return Word32 is
+      Mask : Word32;
+   begin
+      if Config.Need_Rawclk_Numerator then
+         Mask := 16#ffff_ffff#;
+      elsif Config.Has_Fractional_RawClk then
+         Mask := 16#3fff# * 2 ** 16;
+      else
+         Mask := 16#3ff# * 2 ** 0;
+      end if;
+      return Mask;
+   end PCH_RAWCLK_FREQ_MASK;
 
    function PCH_RAWCLK_FREQ (Freq : Frequency_Type) return Word32
    is
@@ -112,6 +124,10 @@
                Freq32 := Freq32 or Shift_Left
                  (Word32 (Div_Round_Closest (1_000, Fraction_K) - 1), 26);
             end if;
+
+            if Config.Need_Rawclk_Numerator then
+               Freq32 := Freq32 or ICP_RAWCLK_NUM;
+            end if;
             return Freq32;
          end;
       else