linux-kernel - Re: [PATCH v7 11/15] drm/msm/dpu: split PIPES_PER

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Message-ID: <f7a1a1ef-bab7-4024-bfca-a9fa33f189b5@quicinc.com>
Date: Wed, 26 Feb 2025 17:38:23 -0800
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Jun Nie <jun.nie@...aro.org>, Rob Clark <robdclark@...il.com>,
        "Abhinav
 Kumar" <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        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 v7 11/15] drm/msm/dpu: split PIPES_PER_STAGE definition
 per plane and mixer



On 2/26/2025 4:31 AM, Jun Nie wrote:
> The stage contains configuration for a mixer pair. Currently the plane
> supports just one stage and 2 pipes. Quad-pipe support will require
> handling 2 stages and 4 pipes at the same time. In preparation for that
> add a separate define, PIPES_PER_PLANE, to denote number of pipes that
> can be used by the plane.
> 
> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    |  2 +-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h |  1 +
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c   | 14 +++++++-------
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h   |  4 ++--
>   4 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index 193818b02197d0737c86de7765d98732fa914e8e..81474823e6799132db71c9712046d359e3535d90 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -463,7 +463,7 @@ static void _dpu_crtc_blend_setup_mixer(struct drm_crtc *crtc,
>   		if (pstate->stage == DPU_STAGE_BASE && format->alpha_enable)
>   			bg_alpha_enable = true;
>   
> -		for (i = 0; i < PIPES_PER_STAGE; i++) {
> +		for (i = 0; i < PIPES_PER_PLANE; i++) {
>   			if (!pstate->pipe[i].sspp)
>   				continue;
>   			set_bit(pstate->pipe[i].sspp->idx, fetch_active);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> index ba7bb05efe9b8cac01a908e53121117e130f91ec..5f010d36672cc6440c69779908b315aab285eaf0 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -34,6 +34,7 @@
>   #define DPU_MAX_PLANES			4
>   #endif
>   
> +#define PIPES_PER_PLANE			2
>   #define PIPES_PER_STAGE			2
>   #ifndef DPU_MAX_DE_CURVES
>   #define DPU_MAX_DE_CURVES		3
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> index ef44af5ab681c8f526333fa92531a2225983aa09..d67f2ad20b4754ca4bcb759a65a39628b7236b0f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> @@ -1078,7 +1078,7 @@ static int dpu_plane_virtual_atomic_check(struct drm_plane *plane,
>   		 * resources are freed by dpu_crtc_assign_plane_resources(),
>   		 * but clean them here.
>   		 */
> -		for (i = 0; i < PIPES_PER_STAGE; i++)
> +		for (i = 0; i < PIPES_PER_PLANE; i++)
>   			pstate->pipe[i].sspp = NULL;
>   
>   		return 0;
> @@ -1129,7 +1129,7 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
>   	pipe_cfg = &pstate->pipe_cfg[0];
>   	r_pipe_cfg = &pstate->pipe_cfg[1];
>   
> -	for (i = 0; i < PIPES_PER_STAGE; i++)
> +	for (i = 0; i < PIPES_PER_PLANE; i++)
>   		pstate->pipe[i].sspp = NULL;
>   
>   	if (!plane_state->fb)
> @@ -1241,7 +1241,7 @@ void dpu_plane_flush(struct drm_plane *plane)
>   		/* force 100% alpha */
>   		_dpu_plane_color_fill(pdpu, pdpu->color_fill, 0xFF);
>   	else {
> -		for (i = 0; i < PIPES_PER_STAGE; i++)
> +		for (i = 0; i < PIPES_PER_PLANE; i++)

Hi Jun,

Is there a reason why only this case was changed to PIPES_PER_PLANE but 
_dpu_plane_color_fill() only loops over PIPES_PER_STAGE?

Similarly, I see that dpu_plane_danger_signal_ctrl() also only loops 
over PIPES_PER_STAGE.

Thanks,

Jessica Zhang

>   			dpu_plane_flush_csc(pdpu, &pstate->pipe[i]);
>   	}
>   
> @@ -1364,7 +1364,7 @@ static void dpu_plane_sspp_atomic_update(struct drm_plane *plane,
>   			&fmt->pixel_format, MSM_FORMAT_IS_UBWC(fmt));
>   
>   	/* move the assignment here, to ease handling to another pairs later */
> -	for (i = 0; i < PIPES_PER_STAGE; i++) {
> +	for (i = 0; i < PIPES_PER_PLANE; i++) {
>   		if (!pstate->pipe[i].sspp)
>   			continue;
>   		dpu_plane_sspp_update_pipe(plane, &pstate->pipe[i],
> @@ -1378,7 +1378,7 @@ static void dpu_plane_sspp_atomic_update(struct drm_plane *plane,
>   
>   	pstate->plane_fetch_bw = 0;
>   	pstate->plane_clk = 0;
> -	for (i = 0; i < PIPES_PER_STAGE; i++) {
> +	for (i = 0; i < PIPES_PER_PLANE; i++) {
>   		if (!pstate->pipe[i].sspp)
>   			continue;
>   		pstate->plane_fetch_bw += _dpu_plane_calc_bw(pdpu->catalog, fmt,
> @@ -1397,7 +1397,7 @@ static void _dpu_plane_atomic_disable(struct drm_plane *plane)
>   	struct dpu_sw_pipe *pipe;
>   	int i;
>   
> -	for (i = 0; i < PIPES_PER_STAGE; i += 1) {
> +	for (i = 0; i < PIPES_PER_PLANE; i += 1) {
>   		pipe = &pstate->pipe[i];
>   		if (!pipe->sspp)
>   			continue;
> @@ -1519,7 +1519,7 @@ static void dpu_plane_atomic_print_state(struct drm_printer *p,
>   
>   	drm_printf(p, "\tstage=%d\n", pstate->stage);
>   
> -	for (i = 0; i < PIPES_PER_STAGE; i++) {
> +	for (i = 0; i < PIPES_PER_PLANE; i++) {
>   		pipe = &pstate->pipe[i];
>   		if (!pipe->sspp)
>   			continue;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
> index 052fd046e8463855b16b30389c2efc67c0c15281..18ff5ec2603ed63ce45f530ced3407d3b70c737b 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
> @@ -33,8 +33,8 @@
>   struct dpu_plane_state {
>   	struct drm_plane_state base;
>   	struct msm_gem_address_space *aspace;
> -	struct dpu_sw_pipe pipe[PIPES_PER_STAGE];
> -	struct dpu_sw_pipe_cfg pipe_cfg[PIPES_PER_STAGE];
> +	struct dpu_sw_pipe pipe[PIPES_PER_PLANE];
> +	struct dpu_sw_pipe_cfg pipe_cfg[PIPES_PER_PLANE];
>   	enum dpu_stage stage;
>   	bool needs_qos_remap;
>   	bool pending;
> 
> -- 
> 2.34.1
>