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>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index fd00f4000f1..649db4c1b69 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);