[PATCH v4 4/4] drm/i915/display: tie DMC wakelock to DC5/6 state transitions

[Luca Coelho]

We only need DMC wakelocks when we allow DC5 and DC6 states.  Add the
calls to enable and disable DMC wakelock accordingly.

Signed-off-by: Luca Coelho <luciano.coe...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power_well.c | 7 +++++++
 drivers/gpu/drm/i915/display/intel_dmc.c                | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c 
b/drivers/gpu/drm/i915/display/intel_display_power_well.c
index e4de40228997..7f4b7602cf02 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -17,6 +17,7 @@
 #include "intel_dkl_phy.h"
 #include "intel_dkl_phy_regs.h"
 #include "intel_dmc.h"
+#include "intel_dmc_wl.h"
 #include "intel_dp_aux_regs.h"
 #include "intel_dpio_phy.h"
 #include "intel_dpll.h"
@@ -821,6 +822,8 @@ void gen9_enable_dc5(struct drm_i915_private *dev_priv)
                intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
                             0, SKL_SELECT_ALTERNATE_DC_EXIT);
 
+       intel_dmc_wl_enable(dev_priv);
+
        gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC5);
 }
 
@@ -850,6 +853,8 @@ void skl_enable_dc6(struct drm_i915_private *dev_priv)
                intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
                             0, SKL_SELECT_ALTERNATE_DC_EXIT);
 
+       intel_dmc_wl_enable(dev_priv);
+
        gen9_set_dc_state(dev_priv, DC_STATE_EN_UPTO_DC6);
 }
 
@@ -970,6 +975,8 @@ void gen9_disable_dc_states(struct drm_i915_private 
*dev_priv)
        if (!HAS_DISPLAY(dev_priv))
                return;
 
+       intel_dmc_wl_disable(dev_priv);
+
        intel_cdclk_get_cdclk(dev_priv, &cdclk_config);
        /* Can't read out voltage_level so can't use intel_cdclk_changed() */
        drm_WARN_ON(&dev_priv->drm,
diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c 
b/drivers/gpu/drm/i915/display/intel_dmc.c
index 3fa851b5c7a6..b20cc018b9a8 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc.c
@@ -550,6 +550,8 @@ void intel_dmc_disable_program(struct drm_i915_private 
*i915)
        pipedmc_clock_gating_wa(i915, true);
        disable_all_event_handlers(i915);
        pipedmc_clock_gating_wa(i915, false);
+
+       intel_dmc_wl_disable(i915);
 }
 
 void assert_dmc_loaded(struct drm_i915_private *i915)
@@ -1079,6 +1081,8 @@ void intel_dmc_suspend(struct drm_i915_private *i915)
        if (dmc)
                flush_work(&dmc->work);
 
+       intel_dmc_wl_disable(i915);
+
        /* Drop the reference held in case DMC isn't loaded. */
        if (!intel_dmc_has_payload(i915))
                intel_dmc_runtime_pm_put(i915);
-- 
2.39.2