[Intel-gfx] [PATCH v2 08/11] drm/i915: Remove the unneeded AUX power ref from intel_dp_hpd_pulse()

[Imre Deak]

The power get/put was added in

commit 1c767b339b3938b19076ffdc9d70aa1e4235a45b
Author: Imre Deak <imre.deak at intel.com>
Date:   Mon Aug 18 14:42:42 2014 +0300

    drm/i915: take display port power domain in DP HPD handle

to account for the HW access in ibx_digital_port_connected(). This
latter call was in turn removed in

commit 7d23e3c37bb3fc6952dc84007ee60cb533fd2d5c
Author: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
Date:   Wed Mar 30 18:05:23 2016 +0530

    drm/i915: Cleaning up intel_dp_hpd_pulse

after which we didn't actually need the power reference.

One way we are accessing the HW during HPD pulse handling is via DP AUX
transfers, but the transfer function takes its own reference, so doesn't
need the reference in intel_dp_hpd_pulse().

The other spot is in the PSR code doing register access, for that we can
use the DISPLAY_CORE power domain in a similar way done in the previous
patch.

Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c  | 20 ++++----------------
 drivers/gpu/drm/i915/intel_psr.c |  6 ++++++
 2 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 24cca12a9a3e..de881bfea011 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -6308,9 +6308,6 @@ enum irqreturn
 intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 {
 	struct intel_dp *intel_dp = &intel_dig_port->dp;
-	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
-	enum irqreturn ret = IRQ_NONE;
-	intel_wakeref_t wakeref;
 
 	if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) {
 		/*
@@ -6333,9 +6330,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 		return IRQ_NONE;
 	}
 
-	wakeref = intel_display_power_get(dev_priv,
-					  intel_aux_power_domain(intel_dig_port));
-
 	if (intel_dp->is_mst) {
 		if (intel_dp_check_mst_status(intel_dp) == -EINVAL) {
 			/*
@@ -6347,7 +6341,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 			intel_dp->is_mst = false;
 			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
 							intel_dp->is_mst);
-			goto put_power;
+
+			return IRQ_NONE;
 		}
 	}
 
@@ -6357,17 +6352,10 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 		handled = intel_dp_short_pulse(intel_dp);
 
 		if (!handled)
-			goto put_power;
+			return IRQ_NONE;
 	}
 
-	ret = IRQ_HANDLED;
-
-put_power:
-	intel_display_power_put(dev_priv,
-				intel_aux_power_domain(intel_dig_port),
-				wakeref);
-
-	return ret;
+	return IRQ_HANDLED;
 }
 
 /* check the VBT to see whether the eDP is on another port */
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 963663ba0edf..856a39c7ee77 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -1251,10 +1251,13 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
 	const u8 errors = DP_PSR_RFB_STORAGE_ERROR |
 			  DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
 			  DP_PSR_LINK_CRC_ERROR;
+	intel_wakeref_t wakeref;
 
 	if (!CAN_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
 		return;
 
+	wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
+
 	mutex_lock(&psr->lock);
 
 	if (!psr->enabled || psr->dp != intel_dp)
@@ -1294,6 +1297,9 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
 	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_ERROR_STATUS, val);
 exit:
 	mutex_unlock(&psr->lock);
+
+	intel_display_power_put_async(dev_priv, POWER_DOMAIN_DISPLAY_CORE,
+				      wakeref);
 }
 
 bool intel_psr_enabled(struct intel_dp *intel_dp)
-- 
2.17.1