linux-kernel - Re: [PATCH v6 2/9] drm/msm/dpu: move pstate->pipe initialization to dpu_plane_atomic

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Message-ID: <1dcf786e-463f-4e51-af71-66ee6077b5f1@quicinc.com>
Date: Fri, 25 Oct 2024 12:00:20 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark
	<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona
 Vetter <simona@...ll.ch>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/9] drm/msm/dpu: move pstate->pipe initialization to
 dpu_plane_atomic_check



On 10/24/2024 5:20 PM, Dmitry Baryshkov wrote:
> In preparation for virtualized planes support, move pstate->pipe
> initialization from dpu_plane_reset() to dpu_plane_atomic_check(). In
> case of virtual planes the plane's pipe will not be known up to the
> point of atomic_check() callback.
> 

I had R-bed this in v5. Did anything change in v6?

But one comment below.

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 25 +++++++++++--------------
>   1 file changed, 11 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> index 37faf5b238b0..725c9a5826fd 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> @@ -797,13 +797,22 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
>   	uint32_t max_linewidth;
>   	unsigned int rotation;
>   	uint32_t supported_rotations;
> -	const struct dpu_sspp_cfg *pipe_hw_caps = pstate->pipe.sspp->cap;
> -	const struct dpu_sspp_sub_blks *sblk = pstate->pipe.sspp->cap->sblk;
> +	const struct dpu_sspp_cfg *pipe_hw_caps;
> +	const struct dpu_sspp_sub_blks *sblk;
>   
>   	if (new_plane_state->crtc)
>   		crtc_state = drm_atomic_get_new_crtc_state(state,
>   							   new_plane_state->crtc);
>   
> +	pipe->sspp = dpu_rm_get_sspp(&kms->rm, pdpu->pipe);
> +	r_pipe->sspp = NULL;
> +
> +	if (!pipe->sspp)
> +		return -EINVAL;
> +
> +	pipe_hw_caps = pipe->sspp->cap;
> +	sblk = pipe->sspp->cap->sblk;
> +
>   	min_scale = FRAC_16_16(1, sblk->maxupscale);
>   	ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
>   						  min_scale,

Do you think it will be better to move the get_sspp() call after the 
drm_atomic_helper_check_plane_state()?

> @@ -820,7 +829,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
>   	pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
>   	r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
>   	r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> -	r_pipe->sspp = NULL;
>   
>   	pstate->stage = DPU_STAGE_0 + pstate->base.normalized_zpos;
>   	if (pstate->stage >= pdpu->catalog->caps->max_mixer_blendstages) {
> @@ -1286,7 +1294,6 @@ static void dpu_plane_reset(struct drm_plane *plane)
>   {
>   	struct dpu_plane *pdpu;
>   	struct dpu_plane_state *pstate;
> -	struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
>   
>   	if (!plane) {
>   		DPU_ERROR("invalid plane\n");
> @@ -1308,16 +1315,6 @@ static void dpu_plane_reset(struct drm_plane *plane)
>   		return;
>   	}
>   
> -	/*
> -	 * Set the SSPP here until we have proper virtualized DPU planes.
> -	 * This is the place where the state is allocated, so fill it fully.
> -	 */
> -	pstate->pipe.sspp = dpu_rm_get_sspp(&dpu_kms->rm, pdpu->pipe);
> -	pstate->pipe.multirect_index = DPU_SSPP_RECT_SOLO;
> -	pstate->pipe.multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> -
> -	pstate->r_pipe.sspp = NULL;
> -
>   	__drm_atomic_helper_plane_reset(plane, &pstate->base);
>   }
>   
>