[Intel-gfx] [PATCH v4 4/9] drm/i915/tgl: mutual exclusive handling for DC3CO and DC5/6

[Anshuman Gupta]

As per B.Specs DC5 and DC6 not allowed when DC3CO is enabled
and DC3CO should be enabled only during VIDEO playback.
Which essentially means both can DC5 and DC3CO can not be
enabled at same time, it makes DC3CO and DC5 mutual exclusive.

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Animesh Manna <animesh.manna at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index c570fda290c4..cd500fbdd8f3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -996,6 +996,10 @@ static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
 
 	gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
 
+	/* DC3CO and DC5/6 are mutually exclusive */
+	if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO)
+		tgl_allow_dc3co(dev_priv);
+
 	dev_priv->display.get_cdclk(dev_priv, &cdclk_state);
 	/* Can't read out voltage_level so can't use intel_cdclk_changed() */
 	WARN_ON(intel_cdclk_needs_modeset(&dev_priv->cdclk.hw, &cdclk_state));
@@ -1020,6 +1024,10 @@ static void gen9_dc_off_power_well_disable(struct drm_i915_private *dev_priv,
 	if (!dev_priv->csr.dmc_payload)
 		return;
 
+	/* DC3CO and DC5/6 are mutually exclusive */
+	if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_DC3CO)
+		tgl_disallow_dc3co(dev_priv);
+
 	if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC6)
 		skl_enable_dc6(dev_priv);
 	else if (dev_priv->csr.allowed_dc_mask & DC_STATE_EN_UPTO_DC5)
-- 
2.21.0