i915/dsi: Configure TE interrupt for cmd mode

Configure TE interrupt as part of the vblank enable call flow.

v2: Hide the private flags check inside configure_te (Jani)

v3: Fix the position of masking de_port_masked for DSI_TE.

v4: Simplify the caller of configure_te (Jani)

v5: Clear IIR, remove the usage of private_flags

v6: including icl_dsi header is not needed
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200924124209.17916-3-vandita.kulkarni@intel.com

drivers/gpu/drm/i915/i915_irq.c

@@ -2651,12 +2651,47 @@ int ilk_enable_vblank(struct drm_crtc *crtc)
 	return 0;
 }
 
+static bool gen11_dsi_configure_te(struct intel_crtc *intel_crtc,
+				   bool enable)
+{
+	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
+	enum port port;
+	u32 tmp;
+
+	if (!(intel_crtc->mode_flags &
+	    (I915_MODE_FLAG_DSI_USE_TE1 | I915_MODE_FLAG_DSI_USE_TE0)))
+		return false;
+
+	/* for dual link cases we consider TE from slave */
+	if (intel_crtc->mode_flags & I915_MODE_FLAG_DSI_USE_TE1)
+		port = PORT_B;
+	else
+		port = PORT_A;
+
+	tmp =  I915_READ(DSI_INTR_MASK_REG(port));
+	if (enable)
+		tmp &= ~DSI_TE_EVENT;
+	else
+		tmp |= DSI_TE_EVENT;
+
+	I915_WRITE(DSI_INTR_MASK_REG(port), tmp);
+
+	tmp = I915_READ(DSI_INTR_IDENT_REG(port));
+	I915_WRITE(DSI_INTR_IDENT_REG(port), tmp);
+
+	return true;
+}
+
 int bdw_enable_vblank(struct drm_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
-	enum pipe pipe = to_intel_crtc(crtc)->pipe;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	enum pipe pipe = intel_crtc->pipe;
 	unsigned long irqflags;
 
+	if (gen11_dsi_configure_te(intel_crtc, true))
+		return 0;
+
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 	bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
@@ -2735,9 +2770,13 @@ void ilk_disable_vblank(struct drm_crtc *crtc)
 void bdw_disable_vblank(struct drm_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
-	enum pipe pipe = to_intel_crtc(crtc)->pipe;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	enum pipe pipe = intel_crtc->pipe;
 	unsigned long irqflags;
 
+	if (gen11_dsi_configure_te(intel_crtc, false))
+		return;
+
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 	bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK);
 	spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
@@ -3449,6 +3488,13 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	if (IS_GEN9_LP(dev_priv))
 		de_port_masked |= BXT_DE_PORT_GMBUS;
 
+	if (INTEL_GEN(dev_priv) >= 11) {
+		enum port port;
+
+		if (intel_bios_is_dsi_present(dev_priv, &port))
+			de_port_masked |= DSI0_TE | DSI1_TE;
+	}
+
 	de_pipe_enables = de_pipe_masked | GEN8_PIPE_VBLANK |
 					   GEN8_PIPE_FIFO_UNDERRUN;