[PATCH 02/13] drm/amdgpu: doorbell registers need only be set once

[Christian König]

Am 04.02.2017 um 05:51 schrieb Andres Rodriguez:
> The CP_MEC_DOORBELL_RANGE_* and CP_PQ_STATUS.DOORBELL_ENABLE registers
> are not HQD specific.
>
> They only need to be set once if at least 1 pipe requested doorbell
> support.
>
> Signed-off-by: Andres Rodriguez <andresx7 at gmail.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h   | 1 +
>   drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 6 +++++-
>   2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 147ce0e..9740800 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1427,6 +1427,7 @@ struct amdgpu_device {
>   	unsigned			num_rings;
>   	struct amdgpu_ring		*rings[AMDGPU_MAX_RINGS];
>   	bool				ib_pool_ready;
> +	bool				doorbell_enabled;

Better put that into amdgpu_gfx and not amdgpu_device, cause that is a 
gfx (CP) specific state.

Apart from that the patch looks good to me.

Christian.

>   	struct amdgpu_sa_manager	ring_tmp_bo;
>   
>   	/* interrupts */
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> index cf738e5..5d0e2c8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
> @@ -4796,7 +4796,7 @@ static void gfx_v8_0_enable_doorbell(struct amdgpu_device *adev, bool enable)
>   {
>   	uint32_t tmp;
>   
> -	if (!enable)
> +	if (!enable || adev->doorbell_enabled)
>   		return;
>   
>   	if ((adev->asic_type == CHIP_CARRIZO) ||
> @@ -4811,6 +4811,8 @@ static void gfx_v8_0_enable_doorbell(struct amdgpu_device *adev, bool enable)
>   	tmp = RREG32(mmCP_PQ_STATUS);
>   	tmp = REG_SET_FIELD(tmp, CP_PQ_STATUS, DOORBELL_ENABLE, 1);
>   	WREG32(mmCP_PQ_STATUS, tmp);
> +
> +	adev->doorbell_enabled = true;
>   }
>   
>   static int gfx_v8_0_mqd_commit(struct amdgpu_device *adev, struct vi_mqd *mqd)
> @@ -5108,6 +5110,8 @@ static int gfx_v8_0_cp_resume(struct amdgpu_device *adev)
>   {
>   	int r;
>   
> +	adev->doorbell_enabled = false;
> +
>   	if (!(adev->flags & AMD_IS_APU))
>   		gfx_v8_0_enable_gui_idle_interrupt(adev, false);
>