linux-kernel - [PATCH v3 14/15] drm/msm/dpu: support SSPP assignment for quad-pipe case

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Message-Id: <20241219-sm8650-v6-13-hmd-deckard-mdss-quad-upstream-32-v3-14-92c7c0a228e3@linaro.org>
Date: Thu, 19 Dec 2024 15:49:32 +0800
From: Jun Nie <jun.nie@...aro.org>
To: 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, 
 Jun Nie <jun.nie@...aro.org>
Subject: [PATCH v3 14/15] drm/msm/dpu: support SSPP assignment for
 quad-pipe case

Support SSPP assignment for quad-pipe case with unified method.
The first 2 pipes can share a set of mixer config and enable
multi-rect mode if condition is met. It is also the case for
the later 2 pipes.

Signed-off-by: Jun Nie <jun.nie@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 67 ++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 1cd98892898a4..57ccb73c45683 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -1163,12 +1163,9 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 	struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
 	struct dpu_rm_sspp_requirements reqs;
 	struct dpu_plane_state *pstate;
-	struct dpu_sw_pipe *pipe;
-	struct dpu_sw_pipe *r_pipe;
-	struct dpu_sw_pipe_cfg *pipe_cfg;
-	struct dpu_sw_pipe_cfg *r_pipe_cfg;
+	struct dpu_plane *pdpu = to_dpu_plane(plane);
 	const struct msm_format *fmt;
-	int i;
+	int i, num_lm, stage_id, num_stages;
 
 	if (plane_state->crtc)
 		crtc_state = drm_atomic_get_new_crtc_state(state,
@@ -1176,12 +1173,6 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 
 	pstate = to_dpu_plane_state(plane_state);
 
-	/* TODO: loop below code for another pair later */
-	pipe = &pstate->pipe[0];
-	r_pipe = &pstate->pipe[1];
-	pipe_cfg = &pstate->pipe_cfg[0];
-	r_pipe_cfg = &pstate->pipe_cfg[1];
-
 	for (i = 0; i < PIPES_PER_PLANE; i++)
 		pstate->pipe[i].sspp = NULL;
 
@@ -1195,24 +1186,42 @@ static int dpu_plane_virtual_assign_resources(struct drm_crtc *crtc,
 
 	reqs.rot90 = drm_rotation_90_or_270(plane_state->rotation);
 
-	pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
-	if (!pipe->sspp)
-		return -ENODEV;
-
-	if (!dpu_plane_try_multirect_parallel(pipe, pipe_cfg, r_pipe, r_pipe_cfg,
-					      pipe->sspp,
-					      msm_framebuffer_format(plane_state->fb),
-					      dpu_kms->catalog->caps->max_linewidth)) {
-		/* multirect is not possible, use two SSPP blocks */
-		r_pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
-		if (!r_pipe->sspp)
-			return -ENODEV;
-
-		pipe->multirect_index = DPU_SSPP_RECT_SOLO;
-		pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
-
-		r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
-		r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+	num_lm = dpu_crtc_get_num_lm(crtc_state);
+	num_stages = (num_lm + 1) / 2;
+	for (stage_id = 0; stage_id < num_stages; stage_id++) {
+		for (i = stage_id * PIPES_PER_STAGE; i < (stage_id + 1) * PIPES_PER_STAGE; i++) {
+			struct dpu_sw_pipe *pipe = &pstate->pipe[i];
+			struct dpu_sw_pipe *r_pipe = &pstate->pipe[i + 1];
+			struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg[i];
+			struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->pipe_cfg[i + 1];
+
+			if (!pipe_cfg->valid)
+				break;
+
+			pipe->sspp = dpu_rm_reserve_sspp(&dpu_kms->rm, global_state, crtc, &reqs);
+			if (!pipe->sspp)
+				return -ENODEV;
+
+			/*
+			 * If current pipe is the first pipe in pipe pair, check
+			 * multi-rect opportunity for the 2nd pipe in the pair.
+			 * SSPP multi-rect mode cross mixer pairs is not supported.
+			 */
+			if ((i % PIPES_PER_STAGE == 0) &&
+			    r_pipe_cfg->valid &&
+			    !dpu_plane_try_multirect_parallel(pipe, pipe_cfg, r_pipe, r_pipe_cfg,
+							      pipe->sspp,
+							      msm_framebuffer_format(plane_state->fb),
+							      dpu_kms->catalog->caps->max_linewidth)) {
+				i++;
+			} else {
+				/* multirect is not possible, use two SSPP blocks */
+				pipe->multirect_index = DPU_SSPP_RECT_SOLO;
+				pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
+				DPU_DEBUG_PLANE(pdpu, "allocating sspp_%d for pipe %d.\n",
+						pipe->sspp->idx - SSPP_NONE, i);
+			}
+		}
 	}
 
 	return dpu_plane_atomic_check_sspp(plane, state, crtc_state);

-- 
2.34.1