[PATCH v2] drm/i915/display: Don't update DBUF_TRACKER_STATE_SERVICE

[Ravi Kumar Vodapalli]

DBUF_TRACKER_STATE_SERVICE is set only during initialization.
We see that it was done for TGL (display version 12) and DG2,
because the field didn't actually have 0x8 as default value,
so the driver had to take care of it.

According to the BSpec.
The most compeling reason why we should not program
that field for other display versions that is not part of the
official programming sequence in BSpec, and doing so could affect
future platforms if the default is changed for some reason.

So we need to check for
1. display version 12
2. DG2.
Other platforms unless stated should use their default value

Bspec: 49213
Signed-off-by: Ravi Kumar Vodapalli <ravi.kumar.vodapalli at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 34465d56def0..9c20459053fe 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -1126,9 +1126,6 @@ static void gen12_dbuf_slices_config(struct intel_display *display)
 {
 	enum dbuf_slice slice;
 
-	if (display->platform.alderlake_p)
-		return;
-
 	for_each_dbuf_slice(display, slice)
 		intel_de_rmw(display, DBUF_CTL_S(slice),
 			     DBUF_TRACKER_STATE_SERVICE_MASK,
@@ -1681,7 +1678,7 @@ static void icl_display_core_init(struct intel_display *display,
 	/* 4. Enable CDCLK. */
 	intel_cdclk_init_hw(display);
 
-	if (DISPLAY_VER(display) >= 12)
+	if (DISPLAY_VER(display) == 12 || display->platform.dg2)
 		gen12_dbuf_slices_config(display);
 
 	/* 5. Enable DBUF. */
-- 
2.25.1