From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Thu, 2 Jun 2022 20:56:49 +0000 (+0300)
Subject: drm/i915: Update eDP fast link training link rate parsing
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f06d1d66d54c223e4f0f73393d94afd88105b6f3;p=linux.git

drm/i915: Update eDP fast link training link rate parsing

We're not parsing the 5.4 Gbps value for the old eDP fast link
training link rate, nor are we parsing the new fast link training
link rate field. Remedy both.

Also we'll now use the actual link rate instead of the DPCD BW
register value.

Note that we're not even using this information for anything
currently, so should perhaps just nuke it all unless someone
is planning on implementing fast link training finally...

v2: Stop using the DPCD BW values (Jani)
    *20 instead of *2 to get the rate in correct units (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220602205649.11283-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
---

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 0f95ca6521159..ccd39daacdbf5 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1366,18 +1366,26 @@ parse_edp(struct drm_i915_private *i915,
 
 	panel->vbt.edp.pps = *edp_pps;
 
-	switch (edp_link_params->rate) {
-	case EDP_RATE_1_62:
-		panel->vbt.edp.rate = DP_LINK_BW_1_62;
-		break;
-	case EDP_RATE_2_7:
-		panel->vbt.edp.rate = DP_LINK_BW_2_7;
-		break;
-	default:
-		drm_dbg_kms(&i915->drm,
-			    "VBT has unknown eDP link rate value %u\n",
-			     edp_link_params->rate);
-		break;
+	if (i915->vbt.version >= 224) {
+		panel->vbt.edp.rate =
+			edp->edp_fast_link_training_rate[panel_type] * 20;
+	} else {
+		switch (edp_link_params->rate) {
+		case EDP_RATE_1_62:
+			panel->vbt.edp.rate = 162000;
+			break;
+		case EDP_RATE_2_7:
+			panel->vbt.edp.rate = 270000;
+			break;
+		case EDP_RATE_5_4:
+			panel->vbt.edp.rate = 540000;
+			break;
+		default:
+			drm_dbg_kms(&i915->drm,
+				    "VBT has unknown eDP link rate value %u\n",
+				    edp_link_params->rate);
+			break;
+		}
 	}
 
 	switch (edp_link_params->lanes) {
diff --git a/drivers/gpu/drm/i915/display/intel_vbt_defs.h b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
index 14f1e1cc92c5f..58aee0a040cfb 100644
--- a/drivers/gpu/drm/i915/display/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/display/intel_vbt_defs.h
@@ -638,6 +638,7 @@ struct bdb_sdvo_panel_dtds {
 #define EDP_30BPP	2
 #define EDP_RATE_1_62	0
 #define EDP_RATE_2_7	1
+#define EDP_RATE_5_4	2
 #define EDP_LANE_1	0
 #define EDP_LANE_2	1
 #define EDP_LANE_4	3