[PATCH 2/4] drm/amdgpu: Put enable gfx off feature to a delay thread

[Quan, Evan]

-               if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
-                       adev->gfx.bin_off = true;
+               schedule_delayed_work(&adev->gfx.delay_gfx_off_enable, GFX_OFF_DELAY_ENABLE);
         } else if (!enable && adev->gfx.bin_off) {
                 if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))
                         adev->gfx.bin_off = false;


I think for disable gfxoff case, you need to use cancle_delayed_work_sync((&adev->gfx.delay_gfx_off_enable). E.g.


if (!cancle_delayed_work_sync((&adev->gfx.delay_gfx_off_enable) && !amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))

                         adev->gfx.bin_off = false;


Regards,

Evan

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Rex Zhu <rex.zhu at amd.com>
Sent: Sunday, July 29, 2018 7:35:48 PM
To: amd-gfx at lists.freedesktop.org
Cc: Zhu, Rex
Subject: [PATCH 2/4] drm/amdgpu: Put enable gfx off feature to a delay thread

delay to enable gfx off feature to avoid gfx on/off frequently

Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 16 ++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c    |  6 ++++--
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 318961d..b59ac02 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -993,6 +993,7 @@ struct amdgpu_gfx {
         bool                            bin_off;
         struct mutex                    gfx_off_ctrl_mutex;
         uint32_t                        disable_gfx_off_request;
+       struct delayed_work             delay_gfx_off_enable;
         /* pipe reservation */
         struct mutex                    pipe_reserve_mutex;
         DECLARE_BITMAP                  (pipe_reserve_bitmap, AMDGPU_MAX_COMPUTE_QUEUES);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index b40ce6f..9f8e267 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1925,6 +1925,20 @@ 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.delay_gfx_off_enable.work);
+
+       mutex_lock(&adev->gfx.gfx_off_ctrl_mutex);
+       if (adev->gfx.bready_for_off && !adev->gfx.bin_off
+                               && adev->gfx.disable_gfx_off_request) {
+               if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
+                       adev->gfx.bin_off = true;
+       }
+       mutex_unlock(&adev->gfx.gfx_off_ctrl_mutex);
+}
+
 /**
  * amdgpu_device_ip_suspend_phase1 - run suspend for hardware IPs (phase 1)
  *
@@ -2394,6 +2408,8 @@ 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.delay_gfx_off_enable,
+                         amdgpu_device_delay_enable_gfx_off);

         adev->pm.ac_power = power_supply_is_system_supplied() > 0 ? true : false;

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
index 68fe9c8..1ea1e8b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
@@ -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.
  */
@@ -384,8 +387,7 @@ void amdgpu_gfx_off_ctrl(struct amdgpu_device *adev, enum amd_ip_block_type clie
  */
         if (adev->gfx.bready_for_off && !adev->gfx.bin_off
                                 && !adev->gfx.disable_gfx_off_request) {
-               if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, true))
-                       adev->gfx.bin_off = true;
+               schedule_delayed_work(&adev->gfx.delay_gfx_off_enable, GFX_OFF_DELAY_ENABLE);
         } else if (!enable && adev->gfx.bin_off) {
                 if (!amdgpu_dpm_set_powergating_by_smu(adev, AMD_IP_BLOCK_TYPE_GFX, false))
                         adev->gfx.bin_off = false;
--
1.9.1

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