drm/amdgpu: disable power control on hybrid laptops

Windows 10 (and some 8.1) systems use standardized
ACPI calls for hybrid laptops to control dGPU power.
Detect those cases and disable the AMD specific ATPX
power control.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c

@@ -183,6 +183,11 @@ static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
 				  ATPX_DFP_SIGNAL_MUXED))
 			atpx->functions.disp_mux_cntl = true;
 
+		if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
+			printk("Hybrid Graphics, ATPX dGPU power cntl disabled\n");
+			atpx->functions.power_cntl = false;
+		}
+
 		kfree(info);
 	}
 	return 0;