drm/amdgpu/vcn: drop gfxoff control for VCN2+

Drop disabling of gfxoff during VCN use.  This allows gfxoff
to kick in and potentially save power if the user is not using
gfx for color space conversion or scaling.

VCN1.0 had a bug which prevented it from working properly with
gfxoff, so we disabled it while using VCN.  That said, most apps
today use gfx for scaling and color space conversion rather than
overlay planes so it was generally in use anyway. This was fixed
on VCN2+, but since we mostly use gfx for color space conversion
and scaling and rapidly powering up/down gfx can negate the
advantages of gfxoff, we left gfxoff disabled. As more
applications use overlay planes for color space conversion
and scaling, this starts to be a win, so go ahead and leave
gfxoff enabled.

Note that VCN1.0 uses vcn_v1_0_idle_work_handler() and
vcn_v1_0_ring_begin_use() so they are not affected by this
patch.

Reviewed-by: James Zhu <James.Zhu@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
index 1dc11dbd62b77ef0d55e6e4e1d2a7c0646e7ee85..647d2c31e8bdaf2015bc83ca4c7b2cb860e9a641 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
@@ -393,7 +393,6 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work)
        }
 
        if (!fences && !atomic_read(&adev->vcn.total_submission_cnt)) {
-               amdgpu_gfx_off_ctrl(adev, true);
                amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN,
                       AMD_PG_STATE_GATE);
                r = amdgpu_dpm_switch_power_profile(adev, PP_SMC_POWER_PROFILE_VIDEO,
@@ -413,7 +412,6 @@ void amdgpu_vcn_ring_begin_use(struct amdgpu_ring *ring)
        atomic_inc(&adev->vcn.total_submission_cnt);
 
        if (!cancel_delayed_work_sync(&adev->vcn.idle_work)) {
-               amdgpu_gfx_off_ctrl(adev, false);
                r = amdgpu_dpm_switch_power_profile(adev, PP_SMC_POWER_PROFILE_VIDEO,
                                true);
                if (r)