[PATCH v2 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.

v2: use intel_vrr_trans_push_enabled_set_clear instead of rmw

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 | 33 ++++++++++++++++++++++--
 drivers/gpu/drm/i915/display/intel_vrr.h |  2 ++
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 4176163ec19a..8f335909f320 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"
 
 /**
@@ -1930,6 +1931,9 @@ 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)
@@ -2166,6 +2170,8 @@ 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 e181aa550cb8..61a9344fcebc 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -324,7 +324,8 @@ void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	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;
 
 	intel_de_write(display, TRANS_PUSH(display, cpu_transcoder),
@@ -336,7 +337,8 @@ 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;
@@ -379,6 +381,33 @@ 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_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	intel_vrr_trans_push_enabled_set_clear(crtc, 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 intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+
+	intel_vrr_trans_push_enabled_set_clear(crtc, 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 b3b45c675020..b954a60e1aae 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -25,6 +25,8 @@ 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