TGL BIOS seems to enable both DBuf slices ocasionally, depending
how many displays are connected, while i915 according to BSpec
was powering on S1 DBuf slice, until a modeset was done.
This was causing a brief flash during the boot as we were
disabling slice, previously used by BIOS with that.
To prevent this, now we are ensuring tht we are enabling
_at least_ one slice, but if there are more, let's not
power them off.
Fixes: ff2cd8635e41 ("drm/i915: Correctly map DBUF slices to pipes")
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display_power.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 53056def5414..b9a9cbad8a03 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -4470,11 +4470,13 @@ void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
{
+ skl_ddb_get_hw_state(dev_priv);
/*
- * Just power up 1 slice, we will
+ * Just power up at least 1 slice, we will
* figure out later which slices we have and what we need.
*/
- icl_dbuf_slices_update(dev_priv, BIT(DBUF_S1));
+ icl_dbuf_slices_update(dev_priv, dev_priv->enabled_dbuf_slices_mask |
+ BIT(DBUF_S1));
}
static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
--
2.24.1.485.gad05a3d8e5
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