drm/i915: Fix TypeC mode initialization during system resume

During system resume DP MST requires AUX to be working already before
the HW state readout of the given encoder. Since AUX requires the
encoder/PHY TypeC mode to be initialized, which atm only happens during
HW state readout, these AUX transfers can change the TypeC mode
incorrectly (disconnecting the PHY for an enabled encoder) and trigger
the state check WARNs in intel_tc_port_sanitize().

Fix this by initializing the TypeC mode earlier both during driver
loading and system resume and making sure that the mode can't change
until the encoder's state is read out. While at it add the missing
DocBook comments and rename
intel_tc_port_sanitize()->intel_tc_port_sanitize_mode() for consistency.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922172148.2913088-1-imre.deak@intel.com

1 files changed, 51 insertions, 15 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index e5af955b5600..b0aa1edd8302 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -687,18 +687,58 @@ static void
 intel_tc_port_link_init_refcount(struct intel_digital_port *dig_port,
 				 int refcount)
 {
+	dig_port->tc_link_refcount = refcount;
+}
+
+/**
+ * intel_tc_port_init_mode: Read out HW state and init the given port's TypeC mode
+ * @dig_port: digital port
+ *
+ * Read out the HW state and initialize the TypeC mode of @dig_port. The mode
+ * will be locked until intel_tc_port_sanitize_mode() is called.
+ */
+void intel_tc_port_init_mode(struct intel_digital_port *dig_port)
+{
 	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	intel_wakeref_t tc_cold_wref;
+	enum intel_display_power_domain domain;
+
+	mutex_lock(&dig_port->tc_lock);
 
+	drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_DISCONNECTED);
+	drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
 	drm_WARN_ON(&i915->drm, dig_port->tc_link_refcount);
-	dig_port->tc_link_refcount = refcount;
+
+	tc_cold_wref = tc_cold_block(dig_port, &domain);
+
+	dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
+	/* Prevent changing dig_port->tc_mode until intel_tc_port_sanitize_mode() is called. */
+	intel_tc_port_link_init_refcount(dig_port, 1);
+	dig_port->tc_lock_wakeref = tc_cold_block(dig_port, &dig_port->tc_lock_power_domain);
+
+	tc_cold_unblock(dig_port, domain, tc_cold_wref);
+
+	drm_dbg_kms(&i915->drm, "Port %s: init mode (%s)\n",
+		    dig_port->tc_port_name,
+		    tc_port_mode_name(dig_port->tc_mode));
+
+	mutex_unlock(&dig_port->tc_lock);
 }
 
-void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
+/**
+ * intel_tc_port_sanitize_mode: Sanitize the given port's TypeC mode
+ * @dig_port: digital port
+ *
+ * Sanitize @dig_port's TypeC mode wrt. the encoder's state right after driver
+ * loading and system resume:
+ * If the encoder is enabled keep the TypeC mode/PHY connected state locked until
+ * the encoder is disabled.
+ * If the encoder is disabled make sure the PHY is disconnected.
+ */
+void intel_tc_port_sanitize_mode(struct intel_digital_port *dig_port)
 {
 	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 	struct intel_encoder *encoder = &dig_port->base;
-	intel_wakeref_t tc_cold_wref;
-	enum intel_display_power_domain domain;
 	int active_links = 0;
 
 	mutex_lock(&dig_port->tc_lock);
@@ -708,21 +748,14 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
 	else if (encoder->base.crtc)
 		active_links = to_intel_crtc(encoder->base.crtc)->active;
 
-	drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_DISCONNECTED);
-	drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
-
-	tc_cold_wref = tc_cold_block(dig_port, &domain);
+	drm_WARN_ON(&i915->drm, dig_port->tc_link_refcount != 1);
+	intel_tc_port_link_init_refcount(dig_port, active_links);
 
-	dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
 	if (active_links) {
 		if (!icl_tc_phy_is_connected(dig_port))
 			drm_dbg_kms(&i915->drm,
 				    "Port %s: PHY disconnected with %d active link(s)\n",
 				    dig_port->tc_port_name, active_links);
-		intel_tc_port_link_init_refcount(dig_port, active_links);
-
-		dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
-							  &dig_port->tc_lock_power_domain);
 	} else {
 		/*
 		 * TBT-alt is the default mode in any case the PHY ownership is not
@@ -736,9 +769,10 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
 				    dig_port->tc_port_name,
 				    tc_port_mode_name(dig_port->tc_mode));
 		icl_tc_phy_disconnect(dig_port);
-	}
 
-	tc_cold_unblock(dig_port, domain, tc_cold_wref);
+		tc_cold_unblock(dig_port, dig_port->tc_lock_power_domain,
+				fetch_and_zero(&dig_port->tc_lock_wakeref));
+	}
 
 	drm_dbg_kms(&i915->drm, "Port %s: sanitize mode (%s)\n",
 		    dig_port->tc_port_name,
@@ -923,4 +957,6 @@ void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy)
 	dig_port->tc_mode = TC_PORT_DISCONNECTED;
 	dig_port->tc_link_refcount = 0;
 	tc_port_load_fia_params(i915, dig_port);
+
+	intel_tc_port_init_mode(dig_port);
 }