[RFC PATCH 08/11] drm/i915/psr: Add interface to notify PSR of vblank enable/disable

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

To implement Wa_16025596647 we need to get notification of vblank interrupt
enable/disable. Add new interface to PSR code for this notification.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 40 ++++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_psr.h |  2 ++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index baf6a7110a55..afb9faed7784 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -3820,6 +3820,46 @@ void intel_psr_notify_pipe_change(struct intel_atomic_state *state,
 	}
 }
 
+/**
+ * intel_psr_notify_vblank_enable_disable - Notify PSR about enable/disable of vblank
+ * @display: intel display struct
+ * @enable: enable/disable
+ *
+ * This is targeted for underrun on idle PSR HW bug (Wa_16025596647) to apply
+ * remove the workaround when vblank is getting enabled/disabled
+ */
+void intel_psr_notify_vblank_enable_disable(struct intel_display *display,
+					    bool enable)
+{
+	struct intel_encoder *encoder;
+
+	for_each_intel_encoder_with_psr(display->drm, encoder) {
+		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+		mutex_lock(&intel_dp->psr.lock);
+		if (intel_dp->psr.panel_replay_enabled) {
+			mutex_unlock(&intel_dp->psr.lock);
+			break;
+		}
+
+		if (intel_dp->psr.enabled)
+			intel_psr_apply_underrun_on_idle_wa_locked(intel_dp);
+
+		mutex_unlock(&intel_dp->psr.lock);
+		return;
+	}
+
+	/*
+	 * NOTE: intel_display_power_set_target_dc_state is used
+	 * only by PSR * code for DC3CO handling. DC3CO target
+	 * state is currently disabled in * PSR code. If DC3CO
+	 * is taken into use we need take that into account here
+	 * as well.
+	 */
+	intel_display_power_set_target_dc_state(display, enable ? DC_STATE_DISABLE :
+						DC_STATE_EN_UPTO_DC6);
+}
+
 static void
 psr_source_status(struct intel_dp *intel_dp, struct seq_file *m)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index bfe368239bc2..a914b7ee3756 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -64,6 +64,8 @@ void intel_psr_notify_pipe_change(struct intel_atomic_state *state,
 				  struct intel_crtc *crtc, bool enable);
 void intel_psr_notify_dc5_dc6(struct intel_display *display);
 void intel_psr_dc5_dc6_wa_init(struct intel_display *display);
+void intel_psr_notify_vblank_enable_disable(struct intel_display *display,
+					    bool enable);
 bool intel_psr_link_ok(struct intel_dp *intel_dp);
 
 void intel_psr_lock(const struct intel_crtc_state *crtc_state);
-- 
2.43.0