disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/nouveau/nvkm/engine/disp/corenv50.c
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@@ -179,6 +179,8 @@
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 		nvkm_error(subdev, "core fini: %08x\n",
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 			   nvkm_rd32(device, 0x610200));
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 	}
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+
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+	chan->suspend_put = nvkm_rd32(device, 0x640000);
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 }
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 static int
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@@ -198,7 +200,7 @@
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 	nvkm_wr32(device, 0x610208, 0x00010000);
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 	nvkm_wr32(device, 0x61020c, 0x00000000);
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 	nvkm_mask(device, 0x610200, 0x00000010, 0x00000010);
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-	nvkm_wr32(device, 0x640000, 0x00000000);
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+	nvkm_wr32(device, 0x640000, chan->suspend_put);
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 	nvkm_wr32(device, 0x610200, 0x01000013);
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 	/* wait for it to go inactive */