drm/nouveau/pci: do a msi rearm on init

On my GP107 when I load nouveau after unloading it, for some reason the GPU stopped sending or the CPU stopped receiving interrupts if MSI was enabled. Doing a rearm once before getting any interrupts fixes this. Signed-off-by: Karol Herbst <[email protected]> Reviewed-by: Thierry Reding <[email protected]> Signed-off-by: Ben Skeggs <[email protected]>
MaxKrummenacher · Dec 19, 2017 · a121027 · a121027
1 parent 81a24b9
commit a121027
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/base.c
@@ -136,6 +136,13 @@ nvkm_pci_init(struct nvkm_subdev *subdev)
 		return ret;
 
 	pci->irq = pdev->irq;
+
+	/* Ensure MSI interrupts are armed, for the case where there are
+	 * already interrupts pending (for whatever reason) at load time.
+	 */
+	if (pci->msi)
+		pci->func->msi_rearm(pci);
+
 	return ret;
 }