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drm/amdgpu/atpx: check for ATIF dGPU wake for display events support

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Some ATPX laptops implement special circuitry to generate
display hotplug events via ACPI when the dGPU is powered off.
Check if this is supported.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2016-09-14 14:01:41 -04:00
parent 9cee3c1f95
commit efc83cf423
2 changed files with 11 additions and 0 deletions
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9
drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
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@@ -29,6 +29,7 @@ struct amdgpu_atpx {
acpi_handle handle;
struct amdgpu_atpx_functions functions;
bool is_hybrid;
bool dgpu_req_power_for_displays;
};
static struct amdgpu_atpx_priv {
@@ -73,6 +74,10 @@ bool amdgpu_is_atpx_hybrid(void) {
return amdgpu_atpx_priv.atpx.is_hybrid;
}
bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
}
/**
* amdgpu_atpx_call - call an ATPX method
*
@@ -213,6 +218,10 @@ static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx)
atpx->is_hybrid = true;
}
atpx->dgpu_req_power_for_displays = false;
if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)
atpx->dgpu_req_power_for_displays = true;
return 0;
}