From 1a92c70ed8053855811d5e8c62e6a14e1d06e4ab Mon Sep 17 00:00:00 2001
From: Manasi Navare <manasi.d.navare@intel.com>
Date: Thu, 8 Jun 2017 13:41:02 -0700
Subject: [PATCH] drm/i915/dp: Generalize intel_dp_link_params function to accept arguments to be validated
Git-commit: 1a92c70ed8053855811d5e8c62e6a14e1d06e4ab
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900

This function now takes the link rate and lane ocunt to be validated
as an argument so that this can be used for validating even the
compliance test link parameters.

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@linux.intel.com>
Tested-by: Nathan Ciobanu <nathan.d.ciobanu@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1496954463-18038-1-git-send-email-manasi.d.navare@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_dp.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -334,19 +334,20 @@ static int intel_dp_common_len_rate_limi
 	return 0;
 }
 
-static bool intel_dp_link_params_valid(struct intel_dp *intel_dp)
+static bool intel_dp_link_params_valid(struct intel_dp *intel_dp, int link_rate,
+				       uint8_t lane_count)
 {
 	/*
 	 * FIXME: we need to synchronize the current link parameters with
 	 * hardware readout. Currently fast link training doesn't work on
 	 * boot-up.
 	 */
-	if (intel_dp->link_rate == 0 ||
-	    intel_dp->link_rate > intel_dp->max_link_rate)
+	if (link_rate == 0 ||
+	    link_rate > intel_dp->max_link_rate)
 		return false;
 
-	if (intel_dp->lane_count == 0 ||
-	    intel_dp->lane_count > intel_dp_max_lane_count(intel_dp))
+	if (lane_count == 0 ||
+	    lane_count > intel_dp_max_lane_count(intel_dp))
 		return false;
 
 	return true;
@@ -4275,7 +4276,8 @@ intel_dp_check_link_status(struct intel_
 	 * Validate the cached values of intel_dp->link_rate and
 	 * intel_dp->lane_count before attempting to retrain.
 	 */
-	if (!intel_dp_link_params_valid(intel_dp))
+	if (!intel_dp_link_params_valid(intel_dp, intel_dp->link_rate,
+					intel_dp->lane_count))
 		return;
 
 	/* Retrain if Channel EQ or CR not ok */