linux-kernel - [PATCH v17 1/4] drm/msm/dpu: Extract plane splitting into a dedicated function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20260121-msm-next-quad-pipe-split-v17-1-6eb6d8675ca2@linaro.org>
Date: Wed, 21 Jan 2026 16:01:50 +0800
From: Jun Nie <jun.nie@...aro.org>
To: Abhinav Kumar <abhinav.kumar@...ux.dev>, 
 Dmitry Baryshkov <lumag@...nel.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Clark <robin.clark@....qualcomm.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>
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 v17 1/4] drm/msm/dpu: Extract plane splitting into a
 dedicated function

dpu_plane_atomic_check_nosspp() currently handles both plane
validation and plane splitting. For better simplicity and to
facilitate future refactoring, move the splitting logic into
its own dedicated function.

Signed-off-by: Jun Nie <jun.nie@...aro.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 51 ++++++++++++++++++++++---------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 9b7a8b46bfa91..66f240ce29d07 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -821,13 +821,8 @@ static int dpu_plane_atomic_check_nosspp(struct drm_plane *plane,
 {
 	int i, ret = 0, min_scale, max_scale;
 	struct dpu_plane *pdpu = to_dpu_plane(plane);
-	struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
-	u64 max_mdp_clk_rate = kms->perf.max_core_clk_rate;
 	struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
-	struct dpu_sw_pipe_cfg *pipe_cfg;
-	struct dpu_sw_pipe_cfg *r_pipe_cfg;
 	struct drm_rect fb_rect = { 0 };
-	uint32_t max_linewidth;
 
 	min_scale = FRAC_16_16(1, MAX_UPSCALE_RATIO);
 	max_scale = MAX_DOWNSCALE_RATIO << 16;
@@ -850,14 +845,6 @@ static int dpu_plane_atomic_check_nosspp(struct drm_plane *plane,
 		return -EINVAL;
 	}
 
-	/* move the assignment here, to ease handling to another pairs later */
-	pipe_cfg = &pstate->pipe_cfg[0];
-	r_pipe_cfg = &pstate->pipe_cfg[1];
-	/* state->src is 16.16, src_rect is not */
-	drm_rect_fp_to_int(&pipe_cfg->src_rect, &new_plane_state->src);
-
-	pipe_cfg->dst_rect = new_plane_state->dst;
-
 	fb_rect.x2 = new_plane_state->fb->width;
 	fb_rect.y2 = new_plane_state->fb->height;
 
@@ -879,6 +866,34 @@ static int dpu_plane_atomic_check_nosspp(struct drm_plane *plane,
 		if (pstate->layout.plane_pitch[i] > DPU_SSPP_MAX_PITCH_SIZE)
 			return -E2BIG;
 
+	pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
+
+	return 0;
+}
+
+static int dpu_plane_split(struct drm_plane *plane,
+			   struct drm_plane_state *new_plane_state,
+			   const struct drm_crtc_state *crtc_state)
+{
+	struct dpu_plane *pdpu = to_dpu_plane(plane);
+	struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
+	u64 max_mdp_clk_rate = kms->perf.max_core_clk_rate;
+	struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
+	struct dpu_sw_pipe_cfg *pipe_cfg;
+	struct dpu_sw_pipe_cfg *r_pipe_cfg;
+	uint32_t max_linewidth;
+
+	if (!new_plane_state->visible)
+		return 0;
+
+	/* move the assignment here, to ease handling to another pairs later */
+	pipe_cfg = &pstate->pipe_cfg[0];
+	r_pipe_cfg = &pstate->pipe_cfg[1];
+	/* state->src is 16.16, src_rect is not */
+	drm_rect_fp_to_int(&pipe_cfg->src_rect, &new_plane_state->src);
+
+	pipe_cfg->dst_rect = new_plane_state->dst;
+
 	max_linewidth = pdpu->catalog->caps->max_linewidth;
 
 	drm_rect_rotate(&pipe_cfg->src_rect,
@@ -910,8 +925,6 @@ static int dpu_plane_atomic_check_nosspp(struct drm_plane *plane,
 				    new_plane_state->fb->width, new_plane_state->fb->height,
 				    new_plane_state->rotation);
 
-	pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
-
 	return 0;
 }
 
@@ -1129,6 +1142,10 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 	if (ret)
 		return ret;
 
+	ret = dpu_plane_split(plane, new_plane_state, crtc_state);
+	if (ret)
+		return ret;
+
 	if (!new_plane_state->visible)
 		return 0;
 
@@ -1169,6 +1186,10 @@ static int dpu_plane_virtual_atomic_check(struct drm_plane *plane,
 	if (ret)
 		return ret;
 
+	ret = dpu_plane_split(plane, plane_state, crtc_state);
+	if (ret)
+		return ret;
+
 	if (!plane_state->visible) {
 		/*
 		 * resources are freed by dpu_crtc_assign_plane_resources(),

-- 
2.43.0