[PATCH v2] drm/i915/vrr: Stop writing VRR_CTL_IGN_MAX_SHIFT for MTL onwards

[Jouni Högander]

According to Bspec VRR_CTL_IGN_MAX_SHIFT doesn't exist for MTL and
onwards. On LunarLake and onwards Bit 30 is "Mask Block PkgC" instead. Stop
writing the bit for MeteorLake and onwards

v2: "Ignore Max Shift" bit doesn't exist on MeteorLake either

Bspec: 68925
Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vrr.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 633a66f6b73b..c6565baf815a 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -444,7 +444,10 @@ static u32 trans_vrr_ctl(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 
-	if (DISPLAY_VER(display) >= 13)
+	if (DISPLAY_VER(display) >= 14)
+		return VRR_CTL_FLIP_LINE_EN |
+			XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state->vrr.guardband);
+	else if (DISPLAY_VER(display) >= 13)
 		return VRR_CTL_IGN_MAX_SHIFT | VRR_CTL_FLIP_LINE_EN |
 			XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state->vrr.guardband);
 	else
-- 
2.43.0