linux-kernel - [PATCH v2 2/2] drm/msm/dpu: try multirect based on mdp clock limits

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Date:   Mon, 11 Sep 2023 15:16:27 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     <freedreno@...ts.freedesktop.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>,
        "Daniel Vetter" <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>, <quic_jesszhan@...cinc.com>,
        <quic_parellan@...cinc.com>, <nespera@...lia.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/2] drm/msm/dpu: try multirect based on mdp clock limits

It's certainly possible that for large resolutions a single DPU SSPP
cannot process the image without exceeding the MDP clock limits but
it can still process it in multirect mode because the source rectangles
will get divided and can fall within the MDP clock limits.

If the SSPP cannot process the image even in multirect mode, then it
will be rejected in dpu_plane_atomic_check_pipe().

Hence try using multirect for resolutions which cannot be processed
by a single SSPP without exceeding the MDP clock limits.

changes in v2:
	- use crtc_state's adjusted_mode instead of mode
	- fix the UBWC condition to check maxlinewidth

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 0be195f9149c..bf063e21e3dd 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -792,6 +792,8 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 										 plane);
 	int ret = 0, min_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 *pipe = &pstate->pipe;
 	struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
@@ -860,14 +862,16 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 
 	max_linewidth = pdpu->catalog->caps->max_linewidth;
 
-	if (drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
+	if ((drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) ||
+	     _dpu_plane_calc_clk(&crtc_state->adjusted_mode, pipe_cfg) > max_mdp_clk_rate) {
 		/*
 		 * In parallel multirect case only the half of the usual width
 		 * is supported for tiled formats. If we are here, we know that
 		 * full width is more than max_linewidth, thus each rect is
 		 * wider than allowed.
 		 */
-		if (DPU_FORMAT_IS_UBWC(fmt)) {
+		if (DPU_FORMAT_IS_UBWC(fmt) &&
+		    drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) {
 			DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u, tiled format\n",
 					DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
 			return -E2BIG;
-- 
2.40.1