From 84e052e626d88c04c03f79dd95708e556d018d97 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Sun, 13 Nov 2011 03:43:30 +1000
Subject: [PATCH] drm/nvd0/disp: handle yet another interrupt

Spotted while messing with overlay channels (probably as a result of
sending a similar "disable" sequence as we do for the flip channels).

The value in 0x61008c was 0x20, which one would reasonably guess is
"bit 5 == something to report about evo channel 5" - but who knows.

Spotted the binary driver getting this too, and it appears to not do
anything exciting as a result.  So, handle it the same way and avoid
an IRQ storm.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
 drivers/gpu/drm/nouveau/nvd0_display.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nvd0_display.c b/drivers/gpu/drm/nouveau/nvd0_display.c
index 8fceebd110e6..51e073828471 100644
--- a/drivers/gpu/drm/nouveau/nvd0_display.c
+++ b/drivers/gpu/drm/nouveau/nvd0_display.c
@@ -1585,6 +1585,12 @@ nvd0_display_intr(struct drm_device *dev)
 	struct nvd0_display *disp = nvd0_display(dev);
 	u32 intr = nv_rd32(dev, 0x610088);
 
+	if (intr & 0x00000001) {
+		u32 stat = nv_rd32(dev, 0x61008c);
+		nv_wr32(dev, 0x61008c, stat);
+		intr &= ~0x00000001;
+	}
+
 	if (intr & 0x00000002) {
 		u32 stat = nv_rd32(dev, 0x61009c);
 		int chid = ffs(stat) - 1;
-- 
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