From f36af22d3ad203ca1ee62917b50cff877243f64d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 2 Jun 2022 23:56:49 +0300
Subject: drm/i915: Update eDP fast link training link rate parsing
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: f06d1d66d54c223e4f0f73393d94afd88105b6f3
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

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>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_bios.c     | 32 ++++++++++++-------
 drivers/gpu/drm/i915/display/intel_vbt_defs.h |  1 +
 2 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index 0922c2eab04b..7078b10dcb5e 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -1368,18 +1368,26 @@ 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 14f1e1cc92c5..58aee0a040cf 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
-- 
2.38.1