drm/hisilicon/hibmc: Add support for vblank interrupt

Add vblank interrupt.
Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -39,16 +39,45 @@ static const struct file_operations hibmc_fops = {
 
 static int hibmc_enable_vblank(struct drm_device *dev, unsigned int pipe)
 {
+	struct hibmc_drm_private *priv =
+		(struct hibmc_drm_private *)dev->dev_private;
+
+	writel(HIBMC_RAW_INTERRUPT_EN_VBLANK(1),
+	       priv->mmio + HIBMC_RAW_INTERRUPT_EN);
+
 	return 0;
 }
 
 static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)
 {
+	struct hibmc_drm_private *priv =
+		(struct hibmc_drm_private *)dev->dev_private;
+
+	writel(HIBMC_RAW_INTERRUPT_EN_VBLANK(0),
+	       priv->mmio + HIBMC_RAW_INTERRUPT_EN);
+}
+
+irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
+{
+	struct drm_device *dev = (struct drm_device *)arg;
+	struct hibmc_drm_private *priv =
+		(struct hibmc_drm_private *)dev->dev_private;
+	u32 status;
+
+	status = readl(priv->mmio + HIBMC_RAW_INTERRUPT);
+
+	if (status & HIBMC_RAW_INTERRUPT_VBLANK(1)) {
+		writel(HIBMC_RAW_INTERRUPT_VBLANK(1),
+		       priv->mmio + HIBMC_RAW_INTERRUPT);
+		drm_handle_vblank(dev, 0);
+	}
+
+	return IRQ_HANDLED;
 }
 
 static struct drm_driver hibmc_driver = {
 	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
-				  DRIVER_ATOMIC,
+				  DRIVER_ATOMIC | DRIVER_HAVE_IRQ,
 	.fops			= &hibmc_fops,
 	.name			= "hibmc",
 	.date			= "20160828",
@@ -62,6 +91,7 @@ static struct drm_driver hibmc_driver = {
 	.dumb_create            = hibmc_dumb_create,
 	.dumb_map_offset        = hibmc_dumb_mmap_offset,
 	.dumb_destroy           = drm_gem_dumb_destroy,
+	.irq_handler		= hibmc_drm_interrupt,
 };
 
 static int hibmc_pm_suspend(struct device *dev)
@@ -268,6 +298,13 @@ static int hibmc_unload(struct drm_device *dev)
 	struct hibmc_drm_private *priv = dev->dev_private;
 
 	hibmc_fbdev_fini(priv);
+
+	if (dev->irq_enabled)
+		drm_irq_uninstall(dev);
+	if (priv->msi_enabled)
+		pci_disable_msi(dev->pdev);
+	drm_vblank_cleanup(dev);
+
 	hibmc_kms_fini(priv);
 	hibmc_mm_fini(priv);
 	dev->dev_private = NULL;
@@ -299,6 +336,23 @@ static int hibmc_load(struct drm_device *dev)
 	if (ret)
 		goto err;
 
+	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
+	if (ret) {
+		DRM_ERROR("failed to initialize vblank: %d\n", ret);
+		goto err;
+	}
+
+	priv->msi_enabled = 0;
+	ret = pci_enable_msi(dev->pdev);
+	if (ret) {
+		DRM_WARN("enabling MSI failed: %d\n", ret);
+	} else {
+		priv->msi_enabled = 1;
+		ret = drm_irq_install(dev, dev->pdev->irq);
+		if (ret)
+			DRM_WARN("install irq failed: %d\n", ret);
+	}
+
 	/* reset all the states of crtc/plane/encoder/connector */
 	drm_mode_config_reset(dev);
 

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -42,6 +42,7 @@ struct hibmc_drm_private {
 	void __iomem   *fb_map;
 	unsigned long  fb_base;
 	unsigned long  fb_size;
+	bool msi_enabled;
 
 	/* drm */
 	struct drm_device  *dev;