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

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Message-ID: <30f4a216-acbf-41e6-beb0-03ef692dc692@quicinc.com>
Date: Tue, 29 Oct 2024 13:42:11 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: 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>,
        <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 10/28/2024 3:46 AM, Dmitry Baryshkov wrote:
> On Fri, Oct 25, 2024 at 12:00:20PM -0700, Abhinav Kumar wrote:
>>
>>
>> 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?
> 
> No, nothing. I'm sorry for forgetting to run `b4 trailers -u`.
> 
>> 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()?
> 
> I'd say, it makes no difference. I'll check your suggestion if I have to
> send another iteration.
> 

Ok, its a minor comment, I am fine with this change otherwise,

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

If you do need to push another version, you can explore that.

>>
>>> @@ -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);
>>>    }
>>>
>