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>

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index c133644..73ba8b0 100644 (file)
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/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);
 

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
index b626caf..e195521 100644 (file)
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
+++ b/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;