[PATCH v6 10/12] drm/i915/psr: Add function for triggering "Frame Change" event

["Jouni Högander" <jouni.hogander@intel.com>]

Add new function to trigger "Frame Change" event for ensuring we are waking
up before vblank evasion.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_psr.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index c6712312a04d4..945cab1537732 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_vblank.h"
 #include "skl_universal_plane.h"
 
 /**
@@ -2289,6 +2290,27 @@ bool intel_psr_needs_block_dc_vblank(const struct intel_crtc_state *crtc_state)
 	return false;
 }
 
+/**
+ * intel_psr_trigger_frame_change_event - Trigger "Frame Change" event
+ * @state: the atomic state
+ * @dsb: DSB context
+ * @crtc: the CRTC
+ *
+ * Generate PSR "Frame Change" event.
+ */
+void intel_psr_trigger_frame_change_event(struct intel_atomic_state *state,
+					  struct intel_dsb *dsb,
+					  struct intel_crtc *crtc)
+{
+	const struct intel_crtc_state *crtc_state =
+		intel_pre_commit_crtc_state(state, crtc);
+	struct intel_display *display = to_intel_display(crtc);
+
+	if (crtc_state->has_psr)
+		intel_de_write_dsb(display, dsb,
+				   CURSURFLIVE(display, crtc->pipe), 0);
+}
+
 static u32 man_trk_ctl_enable_bit_get(struct intel_display *display)
 {
 	struct drm_i915_private *dev_priv = to_i915(display->drm);
diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index e6eba6633a92b..1cd9ab8aa6e81 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -64,6 +64,9 @@ bool intel_psr_link_ok(struct intel_dp *intel_dp);
 
 void intel_psr_lock(const struct intel_crtc_state *crtc_state);
 void intel_psr_unlock(const struct intel_crtc_state *crtc_state);
+void intel_psr_trigger_frame_change_event(struct intel_atomic_state *state,
+					  struct intel_dsb *dsb,
+					  struct intel_crtc *crtc);
 void intel_psr_connector_debugfs_add(struct intel_connector *connector);
 void intel_psr_debugfs_register(struct intel_display *display);
 
-- 
2.43.0