From 8e128e9dc24b53017a5268d5ef43afbf3b1e3fa1 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@intel.com>
Date: Thu, 14 Oct 2021 18:00:59 +0300
Subject: drm/i915/dp: use new link training delay helpers
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Git-commit: b7d5abda8e64fb9cbbd219e667ccb34e4761ce2f
Patch-mainline: v5.17-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

Use the new link training delay helpers, fixing the delays for
128b/132b.

For existing 8b/10b functionality, this will cause additional 1-byte
DPCD reads for LTTPR delays instead of using the cached values. It's
just too complicated to combine generic helpers with local caching in a
sensible way.

Cc: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211014150059.28957-3-jani.nikula@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 .../drm/i915/display/intel_dp_link_training.c | 38 +++++++------------
 1 file changed, 13 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
index 85676c953e0a..a72f2dc93718 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -683,15 +683,6 @@ intel_dp_prepare_link_train(struct intel_dp *intel_dp,
 	return true;
 }
 
-static void intel_dp_link_training_clock_recovery_delay(struct intel_dp *intel_dp,
-							enum drm_dp_phy dp_phy)
-{
-	if (dp_phy == DP_PHY_DPRX)
-		drm_dp_link_train_clock_recovery_delay(&intel_dp->aux, intel_dp->dpcd);
-	else
-		drm_dp_lttpr_link_train_clock_recovery_delay();
-}
-
 static bool intel_dp_adjust_request_changed(const struct intel_crtc_state *crtc_state,
 					    const u8 old_link_status[DP_LINK_STATUS_SIZE],
 					    const u8 new_link_status[DP_LINK_STATUS_SIZE])
@@ -750,6 +741,11 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
 	u8 link_status[DP_LINK_STATUS_SIZE];
 	bool max_vswing_reached = false;
 	char phy_name[10];
+	int delay_us;
+
+	delay_us = drm_dp_read_clock_recovery_delay(&intel_dp->aux,
+						    intel_dp->dpcd, dp_phy,
+						    intel_dp_is_uhbr(crtc_state));
 
 	intel_dp_phy_name(dp_phy, phy_name, sizeof(phy_name));
 
@@ -777,7 +773,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp,
 
 	voltage_tries = 1;
 	for (cr_tries = 0; cr_tries < max_cr_tries; ++cr_tries) {
-		intel_dp_link_training_clock_recovery_delay(intel_dp, dp_phy);
+		usleep_range(delay_us, 2 * delay_us);
 
 		if (drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, dp_phy,
 						     link_status) < 0) {
@@ -895,19 +891,6 @@ static u32 intel_dp_training_pattern(struct intel_dp *intel_dp,
 	return DP_TRAINING_PATTERN_2;
 }
 
-static void
-intel_dp_link_training_channel_equalization_delay(struct intel_dp *intel_dp,
-						  enum drm_dp_phy dp_phy)
-{
-	if (dp_phy == DP_PHY_DPRX) {
-		drm_dp_link_train_channel_eq_delay(&intel_dp->aux, intel_dp->dpcd);
-	} else {
-		const u8 *phy_caps = intel_dp_lttpr_phy_caps(intel_dp, dp_phy);
-
-		drm_dp_lttpr_link_train_channel_eq_delay(&intel_dp->aux, phy_caps);
-	}
-}
-
 /*
  * Perform the link training channel equalization phase on the given DP PHY
  * using one of training pattern 2, 3 or 4 depending on the source and
@@ -925,6 +908,11 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp,
 	u8 link_status[DP_LINK_STATUS_SIZE];
 	bool channel_eq = false;
 	char phy_name[10];
+	int delay_us;
+
+	delay_us = drm_dp_read_channel_eq_delay(&intel_dp->aux,
+						intel_dp->dpcd, dp_phy,
+						intel_dp_is_uhbr(crtc_state));
 
 	intel_dp_phy_name(dp_phy, phy_name, sizeof(phy_name));
 
@@ -944,8 +932,8 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp,
 	}
 
 	for (tries = 0; tries < 5; tries++) {
-		intel_dp_link_training_channel_equalization_delay(intel_dp,
-								  dp_phy);
+		usleep_range(delay_us, 2 * delay_us);
+
 		if (drm_dp_dpcd_read_phy_link_status(&intel_dp->aux, dp_phy,
 						     link_status) < 0) {
 			drm_err(&i915->drm,
-- 
2.38.1