[Intel-gfx] [RFC PATCH 2/2] drm/i915/display: Add sleep for power state connector

[Vinod Govindapillai]

From: Mohammed Khajapasha <mohammed.khajapasha at intel.com>

Add 2sec sleep for power state connector when a monitor
is in power sleep state before atomic commit enable.

Monitors like LG 27UL650-W, 27UK850 goes into power
sleep state and generates long duration hotplug events
even the monitor connected for display, sleep for 2sec
for power state monitor become available before enable
atomic commit.

Signed-off-by: Mohammed Khajapasha <mohammed.khajapasha at intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 80 ++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_display.h |  8 ++
 2 files changed, 88 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 54db81c2cce6..a793f4234460 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -224,6 +224,81 @@ static int intel_compute_global_watermarks(struct intel_atomic_state *state)
 	return 0;
 }
 
+static void
+intel_connectors_wakeup_hpd_suppress(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct i915_hotplug *hpd = &i915->hotplug;
+	bool do_delay = false;
+	struct intel_connector *connector;
+	struct intel_digital_connector_state *conn_state;
+	int i;
+
+	if (!hpd->suppress_wakeup_hpd_enabled)
+		return;
+
+	for_each_new_intel_connector_in_state(state, connector,
+					      conn_state, i) {
+		struct intel_crtc *crtc = to_intel_crtc(conn_state->base.crtc);
+		struct intel_crtc_state *crtc_state;
+
+		if (!crtc || !intel_connector_needs_modeset(state,
+							    &connector->base))
+			continue;
+
+		crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
+		if (!crtc_state->hw.active)
+			continue;
+
+		if (!intel_connector_need_suppress_wakeup_hpd(connector))
+			continue;
+
+		if (time_is_before_jiffies64(connector->disabled_time +
+					     msecs_to_jiffies(MSEC_PER_SEC * 10))) {
+			drm_dbg_kms(&i915->drm,
+				    "[CONNECTOR:%d:%s] Suppress wakeup HPD for 2 secs\n",
+				    connector->base.base.id, connector->base.name);
+			do_delay = true;
+		}
+	}
+
+	if (do_delay)
+		msleep(2 * MSEC_PER_SEC);
+}
+
+static void
+intel_connectors_wakeup_hpd_track_disabling(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct i915_hotplug *hpd = &i915->hotplug;
+	struct intel_connector *connector;
+	struct intel_digital_connector_state *conn_state;
+	int i;
+
+	if (!hpd->suppress_wakeup_hpd_enabled)
+		return;
+
+	for_each_old_intel_connector_in_state(state, connector,
+					      conn_state, i) {
+		struct intel_crtc *crtc = to_intel_crtc(conn_state->base.crtc);
+		struct intel_crtc_state *crtc_state;
+
+		if (!crtc || !intel_connector_needs_modeset(state,
+							    &connector->base))
+			continue;
+
+		crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
+		if (!crtc_state->hw.active)
+			continue;
+
+		drm_dbg_kms(&i915->drm,
+			    "[CONNECTOR:%d:%s] Update disabled time for wakeup HPD handling\n",
+			    connector->base.base.id, connector->base.name);
+
+		connector->disabled_time = get_jiffies_64();
+	}
+}
+
 /* returns HPLL frequency in kHz */
 int vlv_get_hpll_vco(struct drm_i915_private *dev_priv)
 {
@@ -8517,6 +8592,8 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		}
 	}
 
+	intel_connectors_wakeup_hpd_track_disabling(state);
+
 	intel_commit_modeset_disables(state);
 
 	/* FIXME: Eventually get rid of our crtc->config pointer */
@@ -8560,6 +8637,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	dev_priv->display->commit_modeset_enables(state);
 
+	/* sleep for 2sec for power state connector become available */
+	intel_connectors_wakeup_hpd_suppress(state);
+
 	intel_encoders_update_complete(state);
 
 	if (state->modeset)
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index 8513703086b7..12ecf1497b07 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -539,6 +539,14 @@ enum hpd_pin {
 			     ((connector) = to_intel_connector((__state)->base.connectors[__i].ptr), \
 			     (new_connector_state) = to_intel_digital_connector_state((__state)->base.connectors[__i].new_state), 1))
 
+#define for_each_old_intel_connector_in_state(__state, connector, old_connector_state, __i) \
+	for ((__i) = 0; \
+		(__i) < (__state)->base.num_connector; \
+		(__i)++) \
+		for_each_if((__state)->base.connectors[__i].ptr && \
+				((connector) = to_intel_connector((__state)->base.connectors[__i].ptr), \
+				(old_connector_state) = to_intel_digital_connector_state((__state)->base.connectors[__i].old_state), 1))
+
 int intel_atomic_add_affected_planes(struct intel_atomic_state *state,
 				     struct intel_crtc *crtc);
 u8 intel_calc_active_pipes(struct intel_atomic_state *state,
-- 
2.25.1