[Intel-gfx] [RFC 6/7] drm/i915/dsi: Add TE handler for dsi cmd mode.

[Vandita Kulkarni]

In case of dual link, we get the TE on slave.
So clear the TE on slave DSI IIR.

Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 61 +++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index bfb2a63504fb..d12efa72943b 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2628,6 +2628,61 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
 		DRM_ERROR("Unexpected DE Misc interrupt\n");
 }
 
+void gen11_dsi_te_interrupt_handler(struct drm_i915_private *dev_priv,
+				    u32 iir_value)
+{
+	enum pipe pipe = INVALID_PIPE;
+	enum port port;
+	enum transcoder dsi_trans;
+	u32 val;
+
+	/*
+	 * Incase of dual link, TE comes from DSI_1
+	 * this is to check if dual link is enabled
+	 */
+	val = I915_READ(TRANS_DDI_FUNC_CTL2(TRANSCODER_DSI_0));
+	val &= PORT_SYNC_MODE_ENABLE;
+
+	/*
+	 * if dual link is enabled, then read DSI_0
+	 * transcoder registers
+	 */
+	port = ((iir_value & ICL_DSI_1) && val) || (iir_value & ICL_DSI_0) ? PORT_A : PORT_B;
+	dsi_trans = (port == PORT_A) ? TRANSCODER_DSI_0 : TRANSCODER_DSI_1;
+
+	/* Check if DSI configured in command mode */
+	val = I915_READ(DSI_TRANS_FUNC_CONF(dsi_trans));
+	val = (val & OP_MODE_MASK) >> 28;
+
+	if (val) {
+		DRM_ERROR("DSI trancoder not configured in command mode\n");
+		return;
+	}
+
+	/* Get PIPE for handling VBLANK event */
+	val = I915_READ(TRANS_DDI_FUNC_CTL(dsi_trans));
+	switch (val & TRANS_DDI_EDP_INPUT_MASK) {
+	case TRANS_DDI_EDP_INPUT_A_ON:
+		pipe = PIPE_A;
+		break;
+	case TRANS_DDI_EDP_INPUT_B_ONOFF:
+		pipe = PIPE_B;
+		break;
+	case TRANS_DDI_EDP_INPUT_C_ONOFF:
+		pipe = PIPE_C;
+		break;
+	default:
+		DRM_ERROR("Invalid PIPE\n");
+	}
+
+	/* clear TE in dsi IIR */
+	port = (iir_value & ICL_DSI_1) ? PORT_B : PORT_A;
+	val = I915_READ(ICL_DSI_INTR_IDENT_REG(port));
+	I915_WRITE((ICL_DSI_INTR_IDENT_REG(port)), val);
+
+	drm_handle_vblank(&dev_priv->drm, pipe);
+}
+
 static irqreturn_t
 gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 {
@@ -2692,6 +2747,12 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 				found = true;
 			}
 
+			if ((INTEL_GEN(dev_priv) >= 11) &&
+				(iir & (ICL_DSI_0 | ICL_DSI_1))) {
+				gen11_dsi_te_interrupt_handler(dev_priv, iir);
+				found = true;
+			}
+
 			if (!found)
 				DRM_ERROR("Unexpected DE Port interrupt\n");
 		}
-- 
2.21.0.5.gaeb582a