[PATCH 3/7] drm/i915/vrr: Use TRANS_PUSH mechanism for PSR frame change

[Jouni Högander]

In Lunarlake and onwards it is possible to generate "PSR frame change"
event using TRANS_PUSH mechanism. Implement function to enable this and
take PSR into account in intel_vrr_send_push.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c |  6 ++++
 drivers/gpu/drm/i915/display/intel_vrr.c | 45 ++++++++++++++++++++++--
 drivers/gpu/drm/i915/display/intel_vrr.h |  2 ++
 3 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index e3357f3b5c705..be73c1aaf1ee2 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -44,6 +44,7 @@
 #include "intel_psr.h"
 #include "intel_psr_regs.h"
 #include "intel_snps_phy.h"
+#include "intel_vrr.h"
 #include "skl_universal_plane.h"
 
 /**
@@ -1928,6 +1929,9 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 			intel_de_rmw(display, CLKGATE_DIS_MISC, 0,
 				     CLKGATE_DIS_MISC_DMASC_GATING_DIS);
 	}
+
+	if (DISPLAY_VER(dev_priv) >= 20)
+		intel_vrr_psr_frame_change_enable(crtc_state);
 }
 
 static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
@@ -2164,6 +2168,8 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 
 	mutex_lock(&intel_dp->psr.lock);
 
+	if (DISPLAY_VER(display) >= 20)
+		intel_vrr_psr_frame_change_disable(old_crtc_state);
 	intel_psr_disable_locked(intel_dp);
 
 	mutex_unlock(&intel_dp->psr.lock);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 8b4e3f938efea..5925ade4591d4 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -312,12 +312,20 @@ void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+	u32 trans_push_val = TRANS_PUSH_SEND;
 
-	if (!crtc_state->vrr.enable)
+	if (!crtc_state->vrr.enable && (DISPLAY_VER(display) < 20 ||
+					!crtc_state->has_psr))
 		return;
 
+	if (crtc_state->vrr.enable)
+		trans_push_val |= TRANS_PUSH_EN;
+
+	if (DISPLAY_VER(display) >= 20 && crtc_state->has_psr)
+		trans_push_val |= LNL_TRANS_PUSH_PSR_PR_EN;
+
 	intel_de_write(display, TRANS_PUSH(display, cpu_transcoder),
-		       TRANS_PUSH_EN | TRANS_PUSH_SEND);
+		       trans_push_val);
 }
 
 bool intel_vrr_is_push_sent(const struct intel_crtc_state *crtc_state)
@@ -325,7 +333,8 @@ bool intel_vrr_is_push_sent(const struct intel_crtc_state *crtc_state)
 	struct intel_display *display = to_intel_display(crtc_state);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 
-	if (!crtc_state->vrr.enable)
+	if (!crtc_state->vrr.enable && (DISPLAY_VER(display) < 20 ||
+					!crtc_state->has_psr))
 		return false;
 
 	return intel_de_read(display, TRANS_PUSH(display, cpu_transcoder)) & TRANS_PUSH_SEND;
@@ -358,6 +367,36 @@ void intel_vrr_enable(const struct intel_crtc_state *crtc_state)
 	}
 }
 
+/**
+ * intel_vrr_psr_frame_change_enable - Enable PSR frame change mechanism
+ * @crtc_state: Intel crtc state
+ *
+ * This function is for PSR to enable PSR frame change mechanism which is more
+ * controlled way to generate frame change event.
+ */
+void intel_vrr_psr_frame_change_enable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+
+	intel_de_rmw(display, TRANS_PUSH(display, crtc_state->cpu_transcoder),
+		     0, LNL_TRANS_PUSH_PSR_PR_EN);
+}
+
+/**
+ * intel_vrr_psr_frame_change_disable - Disable PSR frame change mechanism
+ * @crtc_state: Intel crtc state
+ *
+ * This function is for PSR to disable PSR frame change mechanism.
+ */
+void intel_vrr_psr_frame_change_disable(const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	intel_de_rmw(dev_priv, TRANS_PUSH(dev_priv, cpu_transcoder),
+		     LNL_TRANS_PUSH_PSR_PR_EN, 0);
+}
+
 void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
 {
 	struct intel_display *display = to_intel_display(old_crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h b/drivers/gpu/drm/i915/display/intel_vrr.h
index 89937858200d3..a75f159168c11 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -23,6 +23,8 @@ void intel_vrr_enable(const struct intel_crtc_state *crtc_state);
 void intel_vrr_send_push(const struct intel_crtc_state *crtc_state);
 bool intel_vrr_is_push_sent(const struct intel_crtc_state *crtc_state);
 void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state);
+void intel_vrr_psr_frame_change_enable(const struct intel_crtc_state *crtc_state);
+void intel_vrr_psr_frame_change_disable(const struct intel_crtc_state *crtc_state);
 void intel_vrr_get_config(struct intel_crtc_state *crtc_state);
 int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state);
 int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state);
-- 
2.34.1