drm/i915/display: Add own counter for Panel Replay vblank workaround

We are about to change meaning of vblank_enabled to fix Panel Replay vblank
workaround. For sake of clarity we need to rename it. Vblank_enabled is
used for i915gm/i945gm vblank irq workaround as well -> instead of rename
add new counter named as vblank_wa_pipes.

v2:
  - s/vblank_wa_pipes/vblank_wa_num_pipes/
  - use int as a type for the counter

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241009134225.1322820-1-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_display_core.h

@@ -455,6 +455,8 @@ struct intel_display {
 		/* For i915gm/i945gm vblank irq workaround */
 		u8 vblank_enabled;
 
+		int vblank_wa_num_pipes;
+
 		struct work_struct vblank_dc_work;
 
 		u32 de_irq_mask[I915_MAX_PIPES];

drivers/gpu/drm/i915/display/intel_display_irq.c

@@ -1424,15 +1424,15 @@ static void intel_display_vblank_dc_work(struct work_struct *work)
 	struct intel_display *display =
 		container_of(work, typeof(*display), irq.vblank_dc_work);
 	struct drm_i915_private *i915 = to_i915(display->drm);
-	u8 vblank_enabled = READ_ONCE(display->irq.vblank_enabled);
+	int vblank_wa_num_pipes = READ_ONCE(display->irq.vblank_wa_num_pipes);
 
 	/*
 	 * 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(i915, vblank_enabled ? DC_STATE_DISABLE :
+	intel_display_power_set_target_dc_state(i915, vblank_wa_num_pipes ? DC_STATE_DISABLE :
 						DC_STATE_EN_UPTO_DC6);
 }
 
@@ -1447,7 +1447,7 @@ int bdw_enable_vblank(struct drm_crtc *_crtc)
 	if (gen11_dsi_configure_te(crtc, true))
 		return 0;
 
-	if (display->irq.vblank_enabled++ == 0 && crtc->block_dc_for_vblank)
+	if (display->irq.vblank_wa_num_pipes++ == 0 && crtc->block_dc_for_vblank)
 		schedule_work(&display->irq.vblank_dc_work);
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
@@ -1478,7 +1478,7 @@ void bdw_disable_vblank(struct drm_crtc *_crtc)
 	bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
 
-	if (--display->irq.vblank_enabled == 0 && crtc->block_dc_for_vblank)
+	if (--display->irq.vblank_wa_num_pipes == 0 && crtc->block_dc_for_vblank)
 		schedule_work(&display->irq.vblank_dc_work);
 }