[coreboot-gerrit] Change in libgfxinit[master]: [HACK] Implement WaHardHangonHotPlug: cnp

[Angel Pons (Code Review)]

Angel Pons has uploaded this change for review. ( https://review.coreboot.org/c/libgfxinit/+/46632 )

Change subject: [HACK] Implement WaHardHangonHotPlug: cnp
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[HACK] Implement WaHardHangonHotPlug: cnp

Change-Id: I861a1f4c7257dbe40af64c7aafac7add94651dfd
Signed-off-by: Angel Pons 
---
M common/haswell_shared/hw-gfx-gma-port_detect.adb
1 file changed, 9 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/32/46632/1

diff --git a/common/haswell_shared/hw-gfx-gma-port_detect.adb b/common/haswell_shared/hw-gfx-gma-port_detect.adb
index 5765941..18d5402 100644
--- a/common/haswell_shared/hw-gfx-gma-port_detect.adb
+++ b/common/haswell_shared/hw-gfx-gma-port_detect.adb
@@ -29,6 +29,8 @@

SHOTPLUG_CTL_DETECT_MASK            : constant := 16#0303_0303#;

+   CHASSIS_CLK_REQ_DURATION_MASK       : constant := 16#f# * 2 **  8
+
    type Digital_Port_Value is array (Digital_Port) of Word32;
    DDI_PORT_DETECTED : constant Digital_Port_Value :=
      (DIGI_B => 1 * 2 **  2,
@@ -87,6 +89,13 @@
          Config.Valid_Port (Analog) := not (DDI_A_X4 or DAC_Disabled);
       end if;

+      -- Display WA #1179 WaHardHangonHotPlug: cnp
+      if Config.CPU_Coffeelake then
+         Registers.Set_Mask
+           (Register => PCH_FDI_CHICKEN_B_C,
+            Mask     => CHASSIS_CLK_REQ_DURATION_MASK);
+      end if;
+
       -- DDI_A
       if Config.Has_Presence_Straps and not Config.Ignore_Presence_Straps then
          Registers.Is_Set_Mask