drm/nv50: punt hotplug irq handling out to workqueue

On DP outputs we'll likely end up running vbios init tables here, which
may sleep.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

4 files changed, 12 insertions, 5 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index f7d4d2a10052..c4f5658b9e49 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -520,6 +520,7 @@ struct drm_nouveau_private {
 
         struct workqueue_struct *wq;
         struct work_struct irq_work;
+        struct work_struct hpd_work;
 
         struct list_head vbl_waiting;
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 2bd59a92fee5..13e73cee4c44 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -51,6 +51,7 @@ nouveau_irq_preinstall(struct drm_device *dev)
 
         if (dev_priv->card_type == NV_50) {
                 INIT_WORK(&dev_priv->irq_work, nv50_display_irq_handler_bh);
+                INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh);
                 INIT_LIST_HEAD(&dev_priv->vbl_waiting);
         }
 }
diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index fd00f4000f14..649db4c1b690 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -887,10 +887,12 @@ nv50_display_error_handler(struct drm_device *dev)
         nv_wr32(dev, NV50_PDISPLAY_TRAPPED_ADDR, 0x90000000);
 }
 
-static void
-nv50_display_irq_hotplug(struct drm_device *dev)
+void
+nv50_display_irq_hotplug_bh(struct work_struct *work)
 {
-        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct drm_nouveau_private *dev_priv =
+                container_of(work, struct drm_nouveau_private, hpd_work);
+        struct drm_device *dev = dev_priv->dev;
         struct drm_connector *connector;
         const uint32_t gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
         uint32_t unplug_mask, plug_mask, change_mask;
@@ -951,8 +953,10 @@ nv50_display_irq_handler(struct drm_device *dev)
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         uint32_t delayed = 0;
 
-        while (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_HOTPLUG)
-                nv50_display_irq_hotplug(dev);
+        if (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_HOTPLUG) {
+                if (!work_pending(&dev_priv->hpd_work))
+                        queue_work(dev_priv->wq, &dev_priv->hpd_work);
+        }
 
         while (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_DISPLAY) {
                 uint32_t intr0 = nv_rd32(dev, NV50_PDISPLAY_INTR_0);
diff --git a/drivers/gpu/drm/nouveau/nv50_display.h b/drivers/gpu/drm/nouveau/nv50_display.h
index 3ae8d0725f63..581d405ac014 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.h
+++ b/drivers/gpu/drm/nouveau/nv50_display.h
@@ -37,6 +37,7 @@
 
 void nv50_display_irq_handler(struct drm_device *dev);
 void nv50_display_irq_handler_bh(struct work_struct *work);
+void nv50_display_irq_hotplug_bh(struct work_struct *work);
 int nv50_display_init(struct drm_device *dev);
 int nv50_display_create(struct drm_device *dev);
 int nv50_display_destroy(struct drm_device *dev);