diff mbox series

[9/9,SRU,L,OEM-6.1] drm/i915: Improve PPS debugs

Message ID 20230110101755.1107104-10-acelan.kao@canonical.com
State New
Headers show
Series Lost display on built-in monitor after suspend | expand

Commit Message

AceLan Kao Jan. 10, 2023, 10:17 a.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

BugLink: https://launchpad.net/bugs/2001599

Always include both the encoder and PPS instance information
in the debug prints so that we know what piece of hardware
we're actually dealing with.

v2: Make sure pps is selected before debug prints/etc. in
    intel_pps_vdd_on_unlocked() on vlv/chv
    There is no pps on pipe C on chv
v3: Allow PPS=INVALID_PIPE for vlv/chv

Cc: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221127155239.26973-1-ville.syrjala@linux.intel.com
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
(cherry picked from commit 4c0eb35fc103eb71e9b842270f449b79b1cf69b2 drm-tip)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
---
 drivers/gpu/drm/i915/display/intel_pps.c | 194 +++++++++++++++--------
 1 file changed, 128 insertions(+), 66 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_pps.c b/drivers/gpu/drm/i915/display/intel_pps.c
index 04ee2fb420e0f..444a00bed1908 100644
--- a/drivers/gpu/drm/i915/display/intel_pps.c
+++ b/drivers/gpu/drm/i915/display/intel_pps.c
@@ -20,6 +20,40 @@  static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
 static void pps_init_delays(struct intel_dp *intel_dp);
 static void pps_init_registers(struct intel_dp *intel_dp, bool force_disable_vdd);
 
+static const char *pps_name(struct drm_i915_private *i915,
+			    struct intel_pps *pps)
+{
+	if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
+		switch (pps->pps_pipe) {
+		case INVALID_PIPE:
+			/*
+			 * FIXME would be nice if we can guarantee
+			 * to always have a valid PPS when calling this.
+			 */
+			return "PPS <none>";
+		case PIPE_A:
+			return "PPS A";
+		case PIPE_B:
+			return "PPS B";
+		default:
+			MISSING_CASE(pps->pps_pipe);
+			break;
+		}
+	} else {
+		switch (pps->pps_idx) {
+		case 0:
+			return "PPS 0";
+		case 1:
+			return "PPS 1";
+		default:
+			MISSING_CASE(pps->pps_idx);
+			break;
+		}
+	}
+
+	return "PPS <invalid>";
+}
+
 intel_wakeref_t intel_pps_lock(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@@ -58,15 +92,15 @@  vlv_power_sequencer_kick(struct intel_dp *intel_dp)
 
 	if (drm_WARN(&dev_priv->drm,
 		     intel_de_read(dev_priv, intel_dp->output_reg) & DP_PORT_EN,
-		     "skipping pipe %c power sequencer kick due to [ENCODER:%d:%s] being active\n",
-		     pipe_name(pipe), dig_port->base.base.base.id,
-		     dig_port->base.base.name))
+		     "skipping %s kick due to [ENCODER:%d:%s] being active\n",
+		     pps_name(dev_priv, &intel_dp->pps),
+		     dig_port->base.base.base.id, dig_port->base.base.name))
 		return;
 
 	drm_dbg_kms(&dev_priv->drm,
-		    "kicking pipe %c power sequencer for [ENCODER:%d:%s]\n",
-		    pipe_name(pipe), dig_port->base.base.base.id,
-		    dig_port->base.base.name);
+		    "kicking %s for [ENCODER:%d:%s]\n",
+		    pps_name(dev_priv, &intel_dp->pps),
+		    dig_port->base.base.base.id, dig_port->base.base.name);
 
 	/* Preserve the BIOS-computed detected bit. This is
 	 * supposed to be read-only.
@@ -93,7 +127,7 @@  vlv_power_sequencer_kick(struct intel_dp *intel_dp)
 
 		if (vlv_force_pll_on(dev_priv, pipe, vlv_get_dpll(dev_priv))) {
 			drm_err(&dev_priv->drm,
-				"Failed to force on pll for pipe %c!\n",
+				"Failed to force on PLL for pipe %c!\n",
 				pipe_name(pipe));
 			return;
 		}
@@ -188,10 +222,9 @@  vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
 	intel_dp->pps.pps_pipe = pipe;
 
 	drm_dbg_kms(&dev_priv->drm,
-		    "picked pipe %c power sequencer for [ENCODER:%d:%s]\n",
-		    pipe_name(intel_dp->pps.pps_pipe),
-		    dig_port->base.base.base.id,
-		    dig_port->base.base.name);
+		    "picked %s for [ENCODER:%d:%s]\n",
+		    pps_name(dev_priv, &intel_dp->pps),
+		    dig_port->base.base.base.id, dig_port->base.base.name);
 
 	/* init power sequencer on this pipe and port */
 	pps_init_delays(intel_dp);
@@ -295,17 +328,15 @@  vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
 	/* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
 	if (intel_dp->pps.pps_pipe == INVALID_PIPE) {
 		drm_dbg_kms(&dev_priv->drm,
-			    "no initial power sequencer for [ENCODER:%d:%s]\n",
-			    dig_port->base.base.base.id,
-			    dig_port->base.base.name);
+			    "[ENCODER:%d:%s] no initial power sequencer\n",
+			    dig_port->base.base.base.id, dig_port->base.base.name);
 		return;
 	}
 
 	drm_dbg_kms(&dev_priv->drm,
-		    "initial power sequencer for [ENCODER:%d:%s]: pipe %c\n",
-		    dig_port->base.base.base.id,
-		    dig_port->base.base.name,
-		    pipe_name(intel_dp->pps.pps_pipe));
+		    "[ENCODER:%d:%s] initial power sequencer: %s\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 }
 
 static int intel_num_pps(struct drm_i915_private *i915)
@@ -384,14 +415,14 @@  pps_initial_setup(struct intel_dp *intel_dp)
 		intel_dp->pps.pps_idx = bxt_initial_pps_idx(i915, pps_any);
 
 		drm_dbg_kms(&i915->drm,
-			    "[ENCODER:%d:%s] no initial power sequencer, assuming %d\n",
+			    "[ENCODER:%d:%s] no initial power sequencer, assuming %s\n",
 			    encoder->base.base.id, encoder->base.name,
-			    intel_dp->pps.pps_idx);
+			    pps_name(i915, &intel_dp->pps));
 	} else {
 		drm_dbg_kms(&i915->drm,
-			    "[ENCODER:%d:%s] initial power sequencer: %d\n",
+			    "[ENCODER:%d:%s] initial power sequencer: %s\n",
 			    encoder->base.base.id, encoder->base.name,
-			    intel_dp->pps.pps_idx);
+			    pps_name(i915, &intel_dp->pps));
 	}
 
 	return intel_pps_is_valid(intel_dp);
@@ -518,15 +549,20 @@  static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
 void intel_pps_check_power_unlocked(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 
 	if (!intel_dp_is_edp(intel_dp))
 		return;
 
 	if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
 		drm_WARN(&dev_priv->drm, 1,
-			 "eDP powered off while attempting aux channel communication.\n");
+			 "[ENCODER:%d:%s] %s powered off while attempting AUX CH communication.\n",
+			 dig_port->base.base.base.id, dig_port->base.base.name,
+			 pps_name(dev_priv, &intel_dp->pps));
 		drm_dbg_kms(&dev_priv->drm,
-			    "PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+			    "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+			    dig_port->base.base.base.id, dig_port->base.base.name,
+			    pps_name(dev_priv, &intel_dp->pps),
 			    intel_de_read(dev_priv, _pp_stat_reg(intel_dp)),
 			    intel_de_read(dev_priv, _pp_ctrl_reg(intel_dp)));
 	}
@@ -544,10 +580,10 @@  void intel_pps_check_power_unlocked(struct intel_dp *intel_dp)
 static void intel_pps_verify_state(struct intel_dp *intel_dp);
 
 static void wait_panel_status(struct intel_dp *intel_dp,
-				       u32 mask,
-				       u32 value)
+			      u32 mask, u32 value)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	i915_reg_t pp_stat_reg, pp_ctrl_reg;
 
 	lockdep_assert_held(&dev_priv->display.pps.mutex);
@@ -558,7 +594,9 @@  static void wait_panel_status(struct intel_dp *intel_dp,
 	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
 	drm_dbg_kms(&dev_priv->drm,
-		    "mask: 0x%08x value: 0x%08x PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+		    "[ENCODER:%d:%s] %s mask: 0x%08x value: 0x%08x PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps),
 		    mask, value,
 		    intel_de_read(dev_priv, pp_stat_reg),
 		    intel_de_read(dev_priv, pp_ctrl_reg));
@@ -566,7 +604,9 @@  static void wait_panel_status(struct intel_dp *intel_dp,
 	if (intel_de_wait_for_register(dev_priv, pp_stat_reg,
 				       mask, value, 5000))
 		drm_err(&dev_priv->drm,
-			"Panel status timeout: PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+			"[ENCODER:%d:%s] %s panel status timeout: PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+			dig_port->base.base.base.id, dig_port->base.base.name,
+			pps_name(dev_priv, &intel_dp->pps),
 			intel_de_read(dev_priv, pp_stat_reg),
 			intel_de_read(dev_priv, pp_ctrl_reg));
 
@@ -576,26 +616,35 @@  static void wait_panel_status(struct intel_dp *intel_dp,
 static void wait_panel_on(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 
-	drm_dbg_kms(&i915->drm, "Wait for panel power on\n");
+	drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power on\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(i915, &intel_dp->pps));
 	wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
 }
 
 static void wait_panel_off(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 
-	drm_dbg_kms(&i915->drm, "Wait for panel power off time\n");
+	drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power off time\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(i915, &intel_dp->pps));
 	wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
 }
 
 static void wait_panel_power_cycle(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	ktime_t panel_power_on_time;
 	s64 panel_power_off_duration;
 
-	drm_dbg_kms(&i915->drm, "Wait for panel power cycle\n");
+	drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] %s wait for panel power cycle\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(i915, &intel_dp->pps));
 
 	/* take the difference of current time and panel power off time
 	 * and then make panel wait for t11_t12 if needed. */
@@ -682,9 +731,12 @@  bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
 	intel_dp->pps.vdd_wakeref = intel_display_power_get(dev_priv,
 							    intel_aux_power_domain(dig_port));
 
-	drm_dbg_kms(&dev_priv->drm, "Turning [ENCODER:%d:%s] VDD on\n",
-		    dig_port->base.base.base.id,
-		    dig_port->base.base.name);
+	pp_stat_reg = _pp_stat_reg(intel_dp);
+	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
+
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turning VDD on\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 
 	if (!edp_have_panel_power(intel_dp))
 		wait_panel_power_cycle(intel_dp);
@@ -692,12 +744,11 @@  bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
 	pp = ilk_get_pp_control(intel_dp);
 	pp |= EDP_FORCE_VDD;
 
-	pp_stat_reg = _pp_stat_reg(intel_dp);
-	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
-
 	intel_de_write(dev_priv, pp_ctrl_reg, pp);
 	intel_de_posting_read(dev_priv, pp_ctrl_reg);
-	drm_dbg_kms(&dev_priv->drm, "PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps),
 		    intel_de_read(dev_priv, pp_stat_reg),
 		    intel_de_read(dev_priv, pp_ctrl_reg));
 	/*
@@ -705,9 +756,9 @@  bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
 	 */
 	if (!edp_have_panel_power(intel_dp)) {
 		drm_dbg_kms(&dev_priv->drm,
-			    "[ENCODER:%d:%s] panel power wasn't enabled\n",
-			    dig_port->base.base.base.id,
-			    dig_port->base.base.name);
+			    "[ENCODER:%d:%s] %s panel power wasn't enabled\n",
+			    dig_port->base.base.base.id, dig_port->base.base.name,
+			    pps_name(dev_priv, &intel_dp->pps));
 		msleep(intel_dp->pps.panel_power_up_delay);
 	}
 
@@ -722,6 +773,7 @@  bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
  */
 void intel_pps_vdd_on(struct intel_dp *intel_dp)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	intel_wakeref_t wakeref;
 	bool vdd;
 
@@ -731,9 +783,10 @@  void intel_pps_vdd_on(struct intel_dp *intel_dp)
 	vdd = false;
 	with_intel_pps_lock(intel_dp, wakeref)
 		vdd = intel_pps_vdd_on_unlocked(intel_dp);
-	I915_STATE_WARN(!vdd, "[ENCODER:%d:%s] VDD already requested on\n",
+	I915_STATE_WARN(!vdd, "[ENCODER:%d:%s] %s VDD already requested on\n",
 			dp_to_dig_port(intel_dp)->base.base.base.id,
-			dp_to_dig_port(intel_dp)->base.base.name);
+			dp_to_dig_port(intel_dp)->base.base.name,
+			pps_name(i915, &intel_dp->pps));
 }
 
 static void intel_pps_vdd_off_sync_unlocked(struct intel_dp *intel_dp)
@@ -751,9 +804,9 @@  static void intel_pps_vdd_off_sync_unlocked(struct intel_dp *intel_dp)
 	if (!edp_have_panel_vdd(intel_dp))
 		return;
 
-	drm_dbg_kms(&dev_priv->drm, "Turning [ENCODER:%d:%s] VDD off\n",
-		    dig_port->base.base.base.id,
-		    dig_port->base.base.name);
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turning VDD off\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 
 	pp = ilk_get_pp_control(intel_dp);
 	pp &= ~EDP_FORCE_VDD;
@@ -765,7 +818,9 @@  static void intel_pps_vdd_off_sync_unlocked(struct intel_dp *intel_dp)
 	intel_de_posting_read(dev_priv, pp_ctrl_reg);
 
 	/* Make sure sequencer is idle before allowing subsequent activity */
-	drm_dbg_kms(&dev_priv->drm, "PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps),
 		    intel_de_read(dev_priv, pp_stat_reg),
 		    intel_de_read(dev_priv, pp_ctrl_reg));
 
@@ -840,9 +895,10 @@  void intel_pps_vdd_off_unlocked(struct intel_dp *intel_dp, bool sync)
 	if (!intel_dp_is_edp(intel_dp))
 		return;
 
-	I915_STATE_WARN(!intel_dp->pps.want_panel_vdd, "[ENCODER:%d:%s] VDD not forced on",
+	I915_STATE_WARN(!intel_dp->pps.want_panel_vdd, "[ENCODER:%d:%s] %s VDD not forced on",
 			dp_to_dig_port(intel_dp)->base.base.base.id,
-			dp_to_dig_port(intel_dp)->base.base.name);
+			dp_to_dig_port(intel_dp)->base.base.name,
+			pps_name(dev_priv, &intel_dp->pps));
 
 	intel_dp->pps.want_panel_vdd = false;
 
@@ -863,14 +919,16 @@  void intel_pps_on_unlocked(struct intel_dp *intel_dp)
 	if (!intel_dp_is_edp(intel_dp))
 		return;
 
-	drm_dbg_kms(&dev_priv->drm, "Turn [ENCODER:%d:%s] panel power on\n",
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turn panel power on\n",
 		    dp_to_dig_port(intel_dp)->base.base.base.id,
-		    dp_to_dig_port(intel_dp)->base.base.name);
+		    dp_to_dig_port(intel_dp)->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 
 	if (drm_WARN(&dev_priv->drm, edp_have_panel_power(intel_dp),
-		     "[ENCODER:%d:%s] panel power already on\n",
+		     "[ENCODER:%d:%s] %s panel power already on\n",
 		     dp_to_dig_port(intel_dp)->base.base.base.id,
-		     dp_to_dig_port(intel_dp)->base.base.name))
+		     dp_to_dig_port(intel_dp)->base.base.name,
+		     pps_name(dev_priv, &intel_dp->pps)))
 		return;
 
 	wait_panel_power_cycle(intel_dp);
@@ -924,12 +982,14 @@  void intel_pps_off_unlocked(struct intel_dp *intel_dp)
 	if (!intel_dp_is_edp(intel_dp))
 		return;
 
-	drm_dbg_kms(&dev_priv->drm, "Turn [ENCODER:%d:%s] panel power off\n",
-		    dig_port->base.base.base.id, dig_port->base.base.name);
+	drm_dbg_kms(&dev_priv->drm, "[ENCODER:%d:%s] %s turn panel power off\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 
 	drm_WARN(&dev_priv->drm, !intel_dp->pps.want_panel_vdd,
-		 "Need [ENCODER:%d:%s] VDD to turn off panel\n",
-		 dig_port->base.base.base.id, dig_port->base.base.name);
+		 "[ENCODER:%d:%s] %s need VDD to turn off panel\n",
+		 dig_port->base.base.base.id, dig_port->base.base.name,
+		 pps_name(dev_priv, &intel_dp->pps));
 
 	pp = ilk_get_pp_control(intel_dp);
 	/* We need to switch off panel power _and_ force vdd, for otherwise some
@@ -1064,9 +1124,9 @@  static void vlv_detach_power_sequencer(struct intel_dp *intel_dp)
 	 * from a port.
 	 */
 	drm_dbg_kms(&dev_priv->drm,
-		    "detaching pipe %c power sequencer from [ENCODER:%d:%s]\n",
-		    pipe_name(pipe), dig_port->base.base.base.id,
-		    dig_port->base.base.name);
+		    "detaching %s from [ENCODER:%d:%s]\n",
+		    pps_name(dev_priv, &intel_dp->pps),
+		    dig_port->base.base.base.id, dig_port->base.base.name);
 	intel_de_write(dev_priv, pp_on_reg, 0);
 	intel_de_posting_read(dev_priv, pp_on_reg);
 
@@ -1084,7 +1144,7 @@  static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
 		drm_WARN(&dev_priv->drm, intel_dp->pps.active_pipe == pipe,
-			 "stealing pipe %c power sequencer from active [ENCODER:%d:%s]\n",
+			 "stealing PPS %c from active [ENCODER:%d:%s]\n",
 			 pipe_name(pipe), encoder->base.base.id,
 			 encoder->base.name);
 
@@ -1092,7 +1152,7 @@  static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
 			continue;
 
 		drm_dbg_kms(&dev_priv->drm,
-			    "stealing pipe %c power sequencer from [ENCODER:%d:%s]\n",
+			    "stealing PPS %c from [ENCODER:%d:%s]\n",
 			    pipe_name(pipe), encoder->base.base.id,
 			    encoder->base.name);
 
@@ -1137,9 +1197,9 @@  void vlv_pps_init(struct intel_encoder *encoder,
 	intel_dp->pps.pps_pipe = crtc->pipe;
 
 	drm_dbg_kms(&dev_priv->drm,
-		    "initializing pipe %c power sequencer for [ENCODER:%d:%s]\n",
-		    pipe_name(intel_dp->pps.pps_pipe), encoder->base.base.id,
-		    encoder->base.name);
+		    "initializing %s for [ENCODER:%d:%s]\n",
+		    pps_name(dev_priv, &intel_dp->pps),
+		    encoder->base.base.id, encoder->base.name);
 
 	/* init power sequencer on this pipe and port */
 	pps_init_delays(intel_dp);
@@ -1163,7 +1223,9 @@  static void pps_vdd_init(struct intel_dp *intel_dp)
 	 * indefinitely.
 	 */
 	drm_dbg_kms(&dev_priv->drm,
-		    "VDD left on by BIOS, adjusting state tracking\n");
+		    "[ENCODER:%d:%s] %s VDD left on by BIOS, adjusting state tracking\n",
+		    dig_port->base.base.base.id, dig_port->base.base.name,
+		    pps_name(dev_priv, &intel_dp->pps));
 	drm_WARN_ON(&dev_priv->drm, intel_dp->pps.vdd_wakeref);
 	intel_dp->pps.vdd_wakeref = intel_display_power_get(dev_priv,
 							    intel_aux_power_domain(dig_port));