[PATCH 2/5] drm/i915: keep AUX powered while PSR is enabled

[José Roberto de Souza]

Hardware can send AUX transactions by it self when PSR is enabled and it
expects that AUX is kept powered up.

Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/intel_psr.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 8b456e4e1b47..225fde979e57 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -516,6 +516,12 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 		goto unlock;
 	}
 
+	/*
+	 * hardware can send AUX transactions by it self when PSR is enabled,
+	 * and it expects that AUX is kept powered up.
+	 */
+	intel_display_power_get(dev_priv, intel_dp->aux_power_domain);
+
 	dev_priv->psr.psr2_support = crtc_state->has_psr2;
 	dev_priv->psr.busy_frontbuffer_bits = 0;
 
@@ -656,6 +662,8 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 	/* Disable PSR on Sink */
 	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, 0);
 
+	intel_display_power_put(dev_priv, intel_dp->aux_power_domain);
+
 	dev_priv->psr.enabled = NULL;
 	mutex_unlock(&dev_priv->psr.lock);
 
-- 
2.16.1