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

Matt Roper
2021-07-01T20:26:36Z

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>
---
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))