[PATCH 39/53] drm/i915/dg2: Don't program BW_BUDDY registers

[Matt Roper]

Although the BW_BUDDY registers still exist, they are not used for
anything on DG2.  This change is expected to hold true for future dgpu's
too.

Bspec: 49218
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index c34ff0947b85..df6358638fee 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -5814,6 +5814,10 @@ static void tgl_bw_buddy_init(struct drm_i915_private *dev_priv)
 	unsigned long abox_mask = INTEL_INFO(dev_priv)->abox_mask;
 	int config, i;
 
+	/* BW_BUDDY registers are not used on dgpu's beyond DG1 */
+	if (IS_DGFX(dev_priv) && !IS_DG1(dev_priv))
+		return;
+
 	if (IS_ALDERLAKE_S(dev_priv) ||
 	    IS_DG1_REVID(dev_priv, DG1_REVID_A0, DG1_REVID_A0) ||
 	    IS_TGL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0))
-- 
2.25.4