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drm/amdgpu: Put enable gfx off feature to a delay thread 

delay to enable gfx off feature to avoid gfx on/off frequently
suggested by Alex and Evan.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Rex Zhu 2018-07-27 21:06:30 +08:00 committed by Alex Deucher
parent d23ee13fba
commit 1e317b99f0
3 changed files with 23 additions and 2 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -954,6 +954,8 @@ struct amdgpu_gfx {
bool gfx_off_state; /* true: enabled, false: disabled */
struct mutex gfx_off_mutex;
uint32_t gfx_off_req_count; /* default 1, enable gfx off: dec 1, disable gfx off: add 1 */
struct delayed_work gfx_off_delay_work;
/* pipe reservation */
struct mutex pipe_reserve_mutex;
DECLARE_BITMAP (pipe_reserve_bitmap, AMDGPU_MAX_COMPUTE_QUEUES);

15
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
View File

@ -1925,6 +1925,19 @@ static void amdgpu_device_ip_late_init_func_handler(struct work_struct *work)
DRM_ERROR("ib ring test failed (%d).\n", r);
}
static void amdgpu_device_delay_enable_gfx_off(struct work_struct *work)
{
struct amdgpu_device *adev =
container_of(work, struct amdgpu_device, gfx.gfx_off_delay_work.work);
mutex_lock(&adev->gfx.gfx_off_mutex);
if (!adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
adev->gfx.gfx_off_state = true;
}
mutex_unlock(&adev->gfx.gfx_off_mutex);
}
/**
* amdgpu_device_ip_suspend_phase1 - run suspend for hardware IPs (phase 1)
*
@ -2394,6 +2407,8 @@ int amdgpu_device_init(struct amdgpu_device *adev,
INIT_DELAYED_WORK(&adev->late_init_work,
amdgpu_device_ip_late_init_func_handler);
INIT_DELAYED_WORK(&adev->gfx.gfx_off_delay_work,
amdgpu_device_delay_enable_gfx_off);
adev->gfx.gfx_off_req_count = 1;
adev->pm.ac_power = power_supply_is_system_supplied() > 0 ? true : false;

8
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
View File

@ -26,6 +26,9 @@
#include "amdgpu.h"
#include "amdgpu_gfx.h"
/* 0.5 second timeout */
#define GFX_OFF_DELAY_ENABLE msecs_to_jiffies(500)
/*
* GPU scratch registers helpers function.
*/
@ -360,6 +363,7 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
if (!adev->powerplay.pp_funcs->set_powergating_by_smu)
return;
mutex_lock(&adev->gfx.gfx_off_mutex);
if (!enable)
@ -368,11 +372,11 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, bool enable)
adev->gfx.gfx_off_req_count--;
if (enable && !adev->gfx.gfx_off_state && !adev->gfx.gfx_off_req_count) {
if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
adev->gfx.gfx_off_state = true;
schedule_delayed_work(&adev->gfx.gfx_off_delay_work, GFX_OFF_DELAY_ENABLE);
} else if (!enable && adev->gfx.gfx_off_state) {
if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))
adev->gfx.gfx_off_state = false;
}
mutex_unlock(&adev->gfx.gfx_off_mutex);
}