disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/nouveau/nvkm/engine/disp/coregv100.c
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@@ -167,6 +167,7 @@
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 	nvkm_mask(device, 0x6104e0, 0x00000010, 0x00000000);
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 	gv100_disp_core_idle(chan);
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 	nvkm_mask(device, 0x6104e0, 0x00000002, 0x00000000);
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+	chan->suspend_put = nvkm_rd32(device, 0x680000);
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 }
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 static int
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@@ -181,7 +182,7 @@
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 	nvkm_wr32(device, 0x610b2c, 0x00000040);
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 	nvkm_mask(device, 0x6104e0, 0x00000010, 0x00000010);
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-	nvkm_wr32(device, 0x680000, 0x00000000);
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+	nvkm_wr32(device, 0x680000, chan->suspend_put);
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 	nvkm_wr32(device, 0x6104e0, 0x00000013);
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 	return gv100_disp_core_idle(chan);
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 }