[Intel-gfx] [PATCH] drm/i915: Enable TPS3/4 on all platforms that support them

[Ville Syrjala <ville.syrjala@linux.intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Stop using HBR2/3 support as a proxy for TPS3/4 support.
The two are no longer 1:1 in the hardware, arguably they
never were due to HSW ULX which does support TPS3 while
being limited to HBR1.

In more recent times GLK gained support for TPS4 while
being limited to HBR2. And on CNL+ some ports support
HBR3 while others are limited to HBR2, but all ports
support TPS4.

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
Let's see if anything has changed regarding this...

 drivers/gpu/drm/i915/display/intel_dp.c       | 12 +++-----
 drivers/gpu/drm/i915/display/intel_dp.h       |  4 +--
 .../drm/i915/display/intel_dp_link_training.c | 30 +++++++++----------
 drivers/gpu/drm/i915/display/intel_psr.c      |  2 +-
 4 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 1400c5b44c83..0028253b4b95 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -817,18 +817,14 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	return intel_mode_valid_max_plane_size(dev_priv, mode, bigjoiner);
 }
 
-bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp)
+bool intel_dp_source_supports_tps3(struct drm_i915_private *i915)
 {
-	int max_rate = intel_dp->source_rates[intel_dp->num_source_rates - 1];
-
-	return max_rate >= 540000;
+	return INTEL_GEN(i915) >= 9 || IS_BROADWELL(i915) || IS_HASWELL(i915);
 }
 
-bool intel_dp_source_supports_hbr3(struct intel_dp *intel_dp)
+bool intel_dp_source_supports_tps4(struct drm_i915_private *i915)
 {
-	int max_rate = intel_dp->source_rates[intel_dp->num_source_rates - 1];
-
-	return max_rate >= 810000;
+	return INTEL_GEN(i915) >= 10 || IS_GEMINILAKE(i915);
 }
 
 static void snprintf_int_array(char *str, size_t len,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 8db5062f6c4a..71ccaee99a0c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -83,8 +83,8 @@ void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
 
 void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
 			   u8 *link_bw, u8 *rate_select);
-bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp);
-bool intel_dp_source_supports_hbr3(struct intel_dp *intel_dp);
+bool intel_dp_source_supports_tps3(struct drm_i915_private *i915);
+bool intel_dp_source_supports_tps4(struct drm_i915_private *i915);
 
 bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp);
 int intel_dp_link_required(int pixel_clock, int bpp);
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 7f3979577fce..cec696af4da3 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
@@ -616,44 +616,44 @@ static u32 intel_dp_training_pattern(struct intel_dp *intel_dp,
 				     const struct intel_crtc_state *crtc_state,
 				     enum drm_dp_phy dp_phy)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	bool source_tps3, sink_tps3, source_tps4, sink_tps4;
 
 	/*
-	 * Intel platforms that support HBR3 also support TPS4. It is mandatory
-	 * for all downstream devices that support HBR3. There are no known eDP
-	 * panels that support TPS4 as of Feb 2018 as per VESA eDP_v1.4b_E1
-	 * specification.
+	 * TPS4 support is mandatory for all downstream devices that
+	 * support HBR3. There are no known eDP panels that support
+	 * TPS4 as of Feb 2018 as per VESA eDP_v1.4b_E1 specification.
 	 * LTTPRs must support TPS4.
 	 */
-	source_tps4 = intel_dp_source_supports_hbr3(intel_dp);
+	source_tps4 = intel_dp_source_supports_tps4(i915);
 	sink_tps4 = dp_phy != DP_PHY_DPRX ||
 		    drm_dp_tps4_supported(intel_dp->dpcd);
 	if (source_tps4 && sink_tps4) {
 		return DP_TRAINING_PATTERN_4;
 	} else if (crtc_state->port_clock == 810000) {
 		if (!source_tps4)
-			drm_dbg_kms(&dp_to_i915(intel_dp)->drm,
-				    "8.1 Gbps link rate without source HBR3/TPS4 support\n");
+			drm_dbg_kms(&i915->drm,
+				    "8.1 Gbps link rate without source TPS4 support\n");
 		if (!sink_tps4)
-			drm_dbg_kms(&dp_to_i915(intel_dp)->drm,
+			drm_dbg_kms(&i915->drm,
 				    "8.1 Gbps link rate without sink TPS4 support\n");
 	}
+
 	/*
-	 * Intel platforms that support HBR2 also support TPS3. TPS3 support is
-	 * also mandatory for downstream devices that support HBR2. However, not
-	 * all sinks follow the spec.
+	 * TPS3 support is mandatory for downstream devices that
+	 * support HBR2. However, not all sinks follow the spec.
 	 */
-	source_tps3 = intel_dp_source_supports_hbr2(intel_dp);
+	source_tps3 = intel_dp_source_supports_tps3(i915);
 	sink_tps3 = dp_phy != DP_PHY_DPRX ||
 		    drm_dp_tps3_supported(intel_dp->dpcd);
 	if (source_tps3 && sink_tps3) {
 		return  DP_TRAINING_PATTERN_3;
 	} else if (crtc_state->port_clock >= 540000) {
 		if (!source_tps3)
-			drm_dbg_kms(&dp_to_i915(intel_dp)->drm,
-				    ">=5.4/6.48 Gbps link rate without source HBR2/TPS3 support\n");
+			drm_dbg_kms(&i915->drm,
+				    ">=5.4/6.48 Gbps link rate without source TPS3 support\n");
 		if (!sink_tps3)
-			drm_dbg_kms(&dp_to_i915(intel_dp)->drm,
+			drm_dbg_kms(&i915->drm,
 				    ">=5.4/6.48 Gbps link rate without sink TPS3 support\n");
 	}
 
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index cd434285e3b7..c47643306328 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -444,7 +444,7 @@ static u32 intel_psr1_get_tp_time(struct intel_dp *intel_dp)
 		val |= EDP_PSR_TP2_TP3_TIME_2500us;
 
 check_tp3_sel:
-	if (intel_dp_source_supports_hbr2(intel_dp) &&
+	if (intel_dp_source_supports_tps3(dev_priv) &&
 	    drm_dp_tps3_supported(intel_dp->dpcd))
 		val |= EDP_PSR_TP1_TP3_SEL;
 	else
-- 
2.26.2

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