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drm/nouveau/mc: bracket interrupt handler with NV_PMC_INTR_EN disable/re-enable 

This looks to be what NVIDIA do pretty much everywhere, since forever.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2013-10-11 14:42:47 +10:00
parent 6dcee40a9b
commit ab5beca895
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/nouveau/core/subdev/mc/base.c
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@ -33,6 +33,9 @@ nouveau_mc_intr(int irq, void *arg)
struct nouveau_subdev *unit;
u32 intr, stat;
nv_wr32(pmc, 0x000140, 0x00000000);
nv_rd32(pmc, 0x000140);
intr = nv_rd32(pmc, 0x000100);
if (intr == 0xffffffff) /* likely fallen off the bus */
intr = 0x00000000;
@ -54,6 +57,7 @@ nouveau_mc_intr(int irq, void *arg)
nv_error(pmc, "unknown intr 0x%08x\n", stat);
}
nv_wr32(pmc, 0x000140, 0x00000001);
return intr ? IRQ_HANDLED : IRQ_NONE;
}