From 85c53878f43431334070065f447ed51d1571688f Mon Sep 17 00:00:00 2001
From: Matt Roper <matthew.d.roper@intel.com>
Date: Wed, 21 Jul 2021 15:30:41 -0700
Subject: drm/i915/dg2: Don't program BW_BUDDY registers
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Git-commit: 47753748ad05f662e54c15a3088d783e5f4772f2
Patch-mainline: v5.15-rc1
References: jsc#SLE-22601
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@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721223043.834562-17-matthew.d.roper@intel.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 b4cd51099771..913647985806 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_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0) ||
IS_RKL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0) ||
--
2.33.1