drm/tilcdc: Add prints on sync lost and FIFO underrun interrupts

Add ratelimited prints on sync lost and FIFO underrun interrupts.
Signed-off-by: NJyri Sarha <jsarha@ti.com>
Reviewed-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -717,6 +717,14 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 		tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
 	}
 
+	if (stat & LCDC_SYNC_LOST)
+		dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
+				    __func__, stat);
+
+	if (stat & LCDC_FIFO_UNDERFLOW)
+		dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
+				    __func__, stat);
+
 	return IRQ_HANDLED;
 }
 

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -382,7 +382,7 @@ static int tilcdc_irq_postinstall(struct drm_device *dev)
 		tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 			   LCDC_V2_UNDERFLOW_INT_ENA |
 			   LCDC_V2_END_OF_FRAME0_INT_ENA |
-			   LCDC_FRAME_DONE);
+			   LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 	}
 
 	return 0;
@@ -401,7 +401,7 @@ static void tilcdc_irq_uninstall(struct drm_device *dev)
 		tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 			LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 			LCDC_V2_END_OF_FRAME0_INT_ENA |
-			LCDC_FRAME_DONE);
+			LCDC_FRAME_DONE | LCDC_SYNC_LOST);
 	}
 }