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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
index 35a1248aaa7778a04fa64957d4d2b65a3911ab9c..3af1c3aceab39b8db9567a0ae1c72a25c549853d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
+++ b/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;