drm/i915: Don't bail early from intel_dp_initial_fastset_check()

Do all the checks in intel_dp_initial_fastset_check() instead
of bailing out on the first condition that triggers.

This makes for better debug logs since we see all the reasons
why the full modeset computation is forced.

Also avoid the risk of someone accidentally adding a check
later in the function that would require connectors_changed=true
(ie. no fastset at all), but an earlier check may have already
bailed out with just mode_changed=true (ie. fastset is still
possible).

Pimp the debugs with the encoder id+name while at it.

v2: Call the return variable 'fastset' to convey its meaning
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922191314.4252-1-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_dp.c

@@ -2306,6 +2306,7 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
 {
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+	bool fastset = true;
 
 	/*
 	 * If BIOS has set an unsupported or non-standard link rate for some
@@ -2313,9 +2314,10 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
 	 */
 	if (intel_dp_rate_index(intel_dp->source_rates, intel_dp->num_source_rates,
 				crtc_state->port_clock) < 0) {
-		drm_dbg_kms(&i915->drm, "Forcing full modeset due to unsupported link rate\n");
+		drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] Forcing full modeset due to unsupported link rate\n",
+			    encoder->base.base.id, encoder->base.name);
 		crtc_state->uapi.connectors_changed = true;
-		return false;
+		fastset = false;
 	}
 
 	/*
@@ -2326,18 +2328,20 @@ bool intel_dp_initial_fastset_check(struct intel_encoder *encoder,
 	 * Remove once we have readout for DSC.
 	 */
 	if (crtc_state->dsc.compression_enable) {
-		drm_dbg_kms(&i915->drm, "Forcing full modeset due to DSC being enabled\n");
+		drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] Forcing full modeset due to DSC being enabled\n",
+			    encoder->base.base.id, encoder->base.name);
 		crtc_state->uapi.mode_changed = true;
-		return false;
+		fastset = false;
 	}
 
 	if (CAN_PSR(intel_dp)) {
-		drm_dbg_kms(&i915->drm, "Forcing full modeset to compute PSR state\n");
+		drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] Forcing full modeset to compute PSR state\n",
+			    encoder->base.base.id, encoder->base.name);
 		crtc_state->uapi.mode_changed = true;
-		return false;
+		fastset = false;
 	}
 
-	return true;
+	return fastset;
 }
 
 static void intel_dp_get_pcon_dsc_cap(struct intel_dp *intel_dp)