[Intel-gfx] [RFC] drm/i915/pps: Add PPS power domain

[Anshuman Gupta]

It abstracts getting the AUX power domain in pps_lock under
PPS power domain. This makes sure that the platforms which really
requires AUX power in order to access PPS registers will get the
reference to necessary power wells.

PPS power domain requires only to track the AUX_A associated
power wells as the platforms need AUX power in order to access PPS
registers supports eDP only on PORT_A.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 7 +++++++
 drivers/gpu/drm/i915/display/intel_display_power.h | 1 +
 drivers/gpu/drm/i915/display/intel_dp.c            | 3 +--
 3 files changed, 9 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 d52374f01316..1dc4ca9e5d1a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -107,6 +107,8 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
 		return "VGA";
 	case POWER_DOMAIN_AUDIO:
 		return "AUDIO";
+	case POWER_DOMAIN_PPS:
+		return "PPS";
 	case POWER_DOMAIN_AUX_A:
 		return "AUX_A";
 	case POWER_DOMAIN_AUX_B:
@@ -2651,11 +2653,13 @@ intel_display_power_put_mask_in_set(struct drm_i915_private *i915,
 	BIT_ULL(POWER_DOMAIN_GT_IRQ) |			\
 	BIT_ULL(POWER_DOMAIN_MODESET) |			\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
+	BIT_ULL(POWER_DOMAIN_PPS) |			\
 	BIT_ULL(POWER_DOMAIN_GMBUS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 #define BXT_DPIO_CMN_A_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |		\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
+	BIT_ULL(POWER_DOMAIN_PPS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 #define BXT_DPIO_CMN_BC_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |		\
@@ -2688,6 +2692,7 @@ intel_display_power_put_mask_in_set(struct drm_i915_private *i915,
 #define GLK_DPIO_CMN_A_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) |		\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
+	BIT_ULL(POWER_DOMAIN_PPS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 #define GLK_DPIO_CMN_B_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) |		\
@@ -2700,6 +2705,7 @@ intel_display_power_put_mask_in_set(struct drm_i915_private *i915,
 #define GLK_DISPLAY_AUX_A_POWER_DOMAINS (		\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |		\
 	BIT_ULL(POWER_DOMAIN_AUX_IO_A) |		\
+	BIT_ULL(POWER_DOMAIN_PPS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 #define GLK_DISPLAY_AUX_B_POWER_DOMAINS (		\
 	BIT_ULL(POWER_DOMAIN_AUX_B) |		\
@@ -2712,6 +2718,7 @@ intel_display_power_put_mask_in_set(struct drm_i915_private *i915,
 	BIT_ULL(POWER_DOMAIN_GT_IRQ) |			\
 	BIT_ULL(POWER_DOMAIN_MODESET) |			\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
+	BIT_ULL(POWER_DOMAIN_PPS) |			\
 	BIT_ULL(POWER_DOMAIN_GMBUS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h b/drivers/gpu/drm/i915/display/intel_display_power.h
index bc30c479be53..7642be3c8e2e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power.h
@@ -55,6 +55,7 @@ enum intel_display_power_domain {
 	POWER_DOMAIN_PORT_OTHER,
 	POWER_DOMAIN_VGA,
 	POWER_DOMAIN_AUDIO,
+	POWER_DOMAIN_PPS,
 	POWER_DOMAIN_AUX_A,
 	POWER_DOMAIN_AUX_B,
 	POWER_DOMAIN_AUX_C,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 8a00e609085f..0e6e5e2d873e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -895,8 +895,7 @@ pps_lock(struct intel_dp *intel_dp)
 	 * See intel_power_sequencer_reset() why we need
 	 * a power domain reference here.
 	 */
-	wakeref = intel_display_power_get(dev_priv,
-					  intel_aux_power_domain(dp_to_dig_port(intel_dp)));
+	wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_PPS);
 
 	mutex_lock(&dev_priv->pps_mutex);
 
-- 
2.26.2