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[01/12] drm/amdgpu: disable power control on hybrid laptops

Message ID 1464814405-19729-2-git-send-email-alexander.deucher@amd.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alex Deucher June 1, 2016, 8:53 p.m. UTC 
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.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
index 35a1248..3af1c3a 100644
--- 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;