[PATCH 3/3] drm/amdgpu: add vce bypass mode for tonga.

[Andy Furniss]

This regresses vce perf badly on tonga

https://bugs.freedesktop.org/show_bug.cgi?id=97494

Maybe I need a better test case or faster cpu or something,
but vce powerplay encode issues disappeared for me with the latest
firmware.

root wrote:
> From: Rex Zhu <Rex.Zhu at amd.com>
>
> fix issue that encode test failed on the second time when
> vce dpm enabled on tonga.
>
> Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
>
> Change-Id: I9c77b631b977ab5cc14dc553b6e6beb502e4bd0e
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/vce_v3_0.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c b/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
> index df66abe..168b0db 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vce_v3_0.c
> @@ -704,7 +704,8 @@ static int vce_v3_0_set_clockgating_state(void *handle,
>   	bool enable = (state == AMD_CG_STATE_GATE) ? true : false;
>   	int i;
>
> -	if (adev->asic_type == CHIP_POLARIS10)
> +	if ((adev->asic_type == CHIP_POLARIS10) ||
> +	    (adev->asic_type == CHIP_TONGA))
>   		vce_v3_0_set_bypass_mode(adev, enable);
>
>   	if (!(adev->cg_flags & AMD_CG_SUPPORT_VCE_MGCG))
>