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  1. Jun 10, 2021
    • Alex Deucher's avatar
      drm/amdgpu/vcn: drop gfxoff control for VCN2+ · 2c1b1ac7
      Alex Deucher authored
      
      
      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: default avatarJames Zhu <James.Zhu@amd.com>
      Acked-by: default avatarChristian König <christian.koenig@amd.com>
      Reviewed-by: default avatarBoyuan Zhang <Boyuan.Zhang@amd.com>
      Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
      2c1b1ac7
  2. Jun 09, 2021