diff options
| author | Andy Lutomirski <luto@mit.edu> | 2010-11-16 18:40:52 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-01-07 13:58:30 -0800 |
| commit | 19e88f19823998401819784fb063f18369005a7e (patch) | |
| tree | 2471e7033c7208b560fc03d3a6d65004f9df7800 /drivers/gpu | |
| parent | 3ec215fbff5b6b9292874776d6c09d954d2e3eb9 (diff) | |
nouveau: Acknowledge HPD irq in handler, not bottom half
commit ab838338a2a9e0cb8346eb0cab9977be13e8dce5 upstream.
The old code generated an interrupt storm bad enough to completely
take down my system.
Signed-off-by: Andy Lutomirski <luto@mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_drv.h | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_irq.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/nv50_display.c | 35 |
3 files changed, 33 insertions, 9 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index b1be617373b6..c926d8891a46 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -531,6 +531,12 @@ struct drm_nouveau_private { struct work_struct irq_work; struct work_struct hpd_work; + struct { + spinlock_t lock; + uint32_t hpd0_bits; + uint32_t hpd1_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 794b0ee30cf6..b62a601737a4 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 612fa6d6a0cb..d967cb65d641 100644 --- a/drivers/gpu/drm/nouveau/nv50_display.c +++ b/drivers/gpu/drm/nouveau/nv50_display.c @@ -1012,11 +1012,18 @@ nv50_display_irq_hotplug_bh(struct work_struct *work) struct drm_connector *connector; const uint32_t gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 }; uint32_t unplug_mask, plug_mask, change_mask; - uint32_t hpd0, hpd1 = 0; + uint32_t hpd0, hpd1; - hpd0 = nv_rd32(dev, 0xe054) & nv_rd32(dev, 0xe050); + spin_lock_irq(&dev_priv->hpd_state.lock); + hpd0 = dev_priv->hpd_state.hpd0_bits; + dev_priv->hpd_state.hpd0_bits = 0; + hpd1 = dev_priv->hpd_state.hpd1_bits; + dev_priv->hpd_state.hpd1_bits = 0; + spin_unlock_irq(&dev_priv->hpd_state.lock); + + hpd0 &= nv_rd32(dev, 0xe050); if (dev_priv->chipset >= 0x90) - hpd1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070); + hpd1 &= nv_rd32(dev, 0xe070); plug_mask = (hpd0 & 0x0000ffff) | (hpd1 << 16); unplug_mask = (hpd0 >> 16) | (hpd1 & 0xffff0000); @@ -1058,10 +1065,6 @@ nv50_display_irq_hotplug_bh(struct work_struct *work) helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF); } - nv_wr32(dev, 0xe054, nv_rd32(dev, 0xe054)); - if (dev_priv->chipset >= 0x90) - nv_wr32(dev, 0xe074, nv_rd32(dev, 0xe074)); - drm_helper_hpd_irq_event(dev); } @@ -1072,8 +1075,22 @@ 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, hpd1_bits = 0; + + hpd0_bits = nv_rd32(dev, 0xe054); + nv_wr32(dev, 0xe054, hpd0_bits); + + if (dev_priv->chipset >= 0x90) { + hpd1_bits = nv_rd32(dev, 0xe074); + nv_wr32(dev, 0xe074, hpd1_bits); + } + + spin_lock(&dev_priv->hpd_state.lock); + dev_priv->hpd_state.hpd0_bits |= hpd0_bits; + dev_priv->hpd_state.hpd1_bits |= hpd1_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) { |