The old code generated an interrupt storm bad enough to completely
take down my system.
This only fixes the bits that are defined nouveau_regs.h. Newer hardware
uses another register that isn't described, and I don't have that hardware
to test.
Signed-off-by: Andy Lutomirski <l...@mit.edu>
Cc: <sta...@kernel.org>
---
drivers/gpu/drm/nouveau/nouveau_drv.h | 5 +++++
drivers/gpu/drm/nouveau/nouveau_irq.c | 1 +
drivers/gpu/drm/nouveau/nv50_display.c | 17 +++++++++++++----
3 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h
b/drivers/gpu/drm/nouveau/nouveau_drv.h
index b1be617..b6c62cc 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -531,6 +531,11 @@ struct drm_nouveau_private {
struct work_struct irq_work;
struct work_struct hpd_work;
+ struct {
+ spinlock_t lock;
+ uint32_t hpd0_bits;
+ } hpd_state;
+
struct list_head vbl_waiting;
struct {
diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c
b/drivers/gpu/drm/nouveau/nouveau_irq.c
index 794b0ee..b62a601 100644
--- a/drivers/gpu/drm/nouveau/nouveau_irq.c
+++ b/drivers/gpu/drm/nouveau/nouveau_irq.c
@@ -52,6 +52,7 @@ 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);
+ spin_lock_init(&dev_priv->hpd_state.lock);
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 83a7d27..0df08e3 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1014,7 +1014,12 @@ nv50_display_irq_hotplug_bh(struct work_struct *work)
uint32_t unplug_mask, plug_mask, change_mask;
uint32_t hpd0, hpd1 = 0;
- hpd0 = nv_rd32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL) & nv_rd32(dev,
NV50_PCONNECTOR_HOTPLUG_INTR);
+ spin_lock_irq(&dev_priv->hpd_state.lock);
+ hpd0 = dev_priv->hpd_state.hpd0_bits;
+ dev_priv->hpd_state.hpd0_bits = 0;
+ spin_unlock_irq(&dev_priv->hpd_state.lock);
+
+ hpd0 &= nv_rd32(dev, NV50_PCONNECTOR_HOTPLUG_INTR);
if (dev_priv->chipset >= 0x90)
hpd1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070);
@@ -1058,7 +1063,6 @@ nv50_display_irq_hotplug_bh(struct work_struct *work)
helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF);
}
- nv_wr32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL, nv_rd32(dev,
NV50_PCONNECTOR_HOTPLUG_CTRL));
if (dev_priv->chipset >= 0x90)
nv_wr32(dev, 0xe074, nv_rd32(dev, 0xe074));
@@ -1072,8 +1076,13 @@ nv50_display_irq_handler(struct drm_device *dev)
uint32_t delayed = 0;
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);
+ uint32_t hpd0_bits = nv_rd32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL);
+ nv_wr32(dev, NV50_PCONNECTOR_HOTPLUG_CTRL, hpd0_bits);
+ spin_lock(&dev_priv->hpd_state.lock);
+ dev_priv->hpd_state.hpd0_bits |= hpd0_bits;
+ spin_unlock(&dev_priv->hpd_state.lock);
+
+ queue_work(dev_priv->wq, &dev_priv->hpd_work);
}
while (nv_rd32(dev, NV50_PMC_INTR_0) & NV50_PMC_INTR_0_DISPLAY) {
--
1.7.3.2
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