From: "Dhinakaran Pandiyan" <dhinakaran.pandi...@intel.com>

PSR on CNL requires AUX IO wells to be kept on and the existing AUX domain
for AUX-A enables DC_OFF well too. This is not required, so add a new
AUX_IO_A domain for AUX-A to allow DC states to remain enabled. Other AUX
channels re-use the existing AUX domains.

v4: Reword comment (Rodrigo and Ville)
    Rename _get and _put functions to include aux_io substring(Rodrigo)
    Remove unnecessary diff that got included.
v3: Extract aux domain selection into a function (Ville)
v2: Add AUX IO domain only for AUX-A
    Rebased on top of Ville's AUX series.

Cc: Imre Deak <imre.d...@intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Suggested-by: Imre Deak <imre.d...@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
 drivers/gpu/drm/i915/intel_display.h    |  1 +
 drivers/gpu/drm/i915/intel_psr.c        | 41 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_runtime_pm.c |  3 +++
 3 files changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.h 
b/drivers/gpu/drm/i915/intel_display.h
index f5733a2576e7..4e7418b345bc 100644
--- a/drivers/gpu/drm/i915/intel_display.h
+++ b/drivers/gpu/drm/i915/intel_display.h
@@ -186,6 +186,7 @@ enum intel_display_power_domain {
        POWER_DOMAIN_AUX_C,
        POWER_DOMAIN_AUX_D,
        POWER_DOMAIN_AUX_F,
+       POWER_DOMAIN_AUX_IO_A,
        POWER_DOMAIN_GMBUS,
        POWER_DOMAIN_MODESET,
        POWER_DOMAIN_GT_IRQ,
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 2ef374f936b9..04430d4c99c9 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -56,6 +56,43 @@
 #include "intel_drv.h"
 #include "i915_drv.h"
 
+static inline enum intel_display_power_domain
+psr_aux_domain(struct intel_dp *intel_dp)
+{
+       /* CNL HW requires corresponding AUX IOs to be powered up for PSR.
+        * However, for non-A AUX ports the corresponding non-EDP transcoders
+        * would have already enabled power well 2 and DC_OFF. This means we can
+        * acquire a wider POWER_DOMAIN_AUX_{B,C,D,F} reference instead of a
+        * specific AUX_IO reference without powering up any extra wells.
+        * Note that PSR is enabled only on Port A even though this function
+        * returns the correct domain for other ports too.
+        */
+       return intel_dp->aux_ch == AUX_CH_A ? POWER_DOMAIN_AUX_IO_A :
+                                             intel_dp->aux_power_domain;
+}
+
+static void psr_aux_io_power_get(struct intel_dp *intel_dp)
+{
+       struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+       struct drm_i915_private *dev_priv = 
to_i915(intel_dig_port->base.base.dev);
+
+       if (INTEL_GEN(dev_priv) < 10)
+               return;
+
+       intel_display_power_get(dev_priv, psr_aux_domain(intel_dp));
+}
+
+static void psr_aux_io_power_put(struct intel_dp *intel_dp)
+{
+       struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+       struct drm_i915_private *dev_priv = 
to_i915(intel_dig_port->base.base.dev);
+
+       if (INTEL_GEN(dev_priv) < 10)
+               return;
+
+       intel_display_power_put(dev_priv, psr_aux_domain(intel_dp));
+}
+
 static bool vlv_is_psr_active_on_pipe(struct drm_device *dev, int pipe)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);
@@ -459,6 +496,8 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp,
        enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
        u32 chicken;
 
+       psr_aux_io_power_get(intel_dp);
+
        if (dev_priv->psr.psr2_support) {
                chicken = PSR2_VSC_ENABLE_PROG_HEADER;
                if (dev_priv->psr.y_cord_support)
@@ -617,6 +656,8 @@ static void hsw_psr_disable(struct intel_dp *intel_dp,
                else
                        WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
        }
+
+       psr_aux_io_power_put(intel_dp);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c 
b/drivers/gpu/drm/i915/intel_runtime_pm.c
index b7924feb9f27..53ea564f971e 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -130,6 +130,8 @@ intel_display_power_domain_str(enum 
intel_display_power_domain domain)
                return "AUX_D";
        case POWER_DOMAIN_AUX_F:
                return "AUX_F";
+       case POWER_DOMAIN_AUX_IO_A:
+               return "AUX_IO_A";
        case POWER_DOMAIN_GMBUS:
                return "GMBUS";
        case POWER_DOMAIN_INIT:
@@ -1853,6 +1855,7 @@ void intel_display_power_put(struct drm_i915_private 
*dev_priv,
        BIT_ULL(POWER_DOMAIN_INIT))
 #define CNL_DISPLAY_AUX_A_POWER_DOMAINS (              \
        BIT_ULL(POWER_DOMAIN_AUX_A) |                   \
+       BIT_ULL(POWER_DOMAIN_AUX_IO_A) |                \
        BIT_ULL(POWER_DOMAIN_INIT))
 #define CNL_DISPLAY_AUX_B_POWER_DOMAINS (              \
        BIT_ULL(POWER_DOMAIN_AUX_B) |                   \
-- 
2.14.1

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