drm/msm/dpu: fail dpu_plane_atomic_check() based on mdp clk limits

Currently, dpu_plane_atomic_check() does not check whether the
plane can process the image without exceeding the per chipset
limits for MDP clock. This leads to underflow issues because the
SSPP is not able to complete the processing for the data rate of
the display.

Fail the dpu_plane_atomic_check() if the SSPP cannot process the
image without exceeding the MDP clock limits.

changes in v2:
	- use crtc_state's adjusted_mode instead of mode

Fixes: 25fdd59 ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Abhinav Kumar <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/556819/
Link: https://lore.kernel.org/r/[email protected]

Author: Abhinav Kumar

drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c

@@ -733,9 +733,11 @@ static int dpu_plane_check_inline_rotation(struct dpu_plane *pdpu,
 static int dpu_plane_atomic_check_pipe(struct dpu_plane *pdpu,
 		struct dpu_sw_pipe *pipe,
 		struct dpu_sw_pipe_cfg *pipe_cfg,
-		const struct dpu_format *fmt)
+		const struct dpu_format *fmt,
+		const struct drm_display_mode *mode)
 {
 	uint32_t min_src_size;
+	struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
 
 	min_src_size = DPU_FORMAT_IS_YUV(fmt) ? 2 : 1;
 
@@ -774,6 +776,12 @@ static int dpu_plane_atomic_check_pipe(struct dpu_plane *pdpu,
 		return -EINVAL;
 	}
 
+	/* max clk check */
+	if (_dpu_plane_calc_clk(mode, pipe_cfg) > kms->perf.max_core_clk_rate) {
+		DPU_DEBUG_PLANE(pdpu, "plane exceeds max mdp core clk limits\n");
+		return -E2BIG;
+	}
+
 	return 0;
 }
 
@@ -899,12 +907,13 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
 		r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
 	}
 
-	ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt);
+	ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt, &crtc_state->adjusted_mode);
 	if (ret)
 		return ret;
 
 	if (r_pipe->sspp) {
-		ret = dpu_plane_atomic_check_pipe(pdpu, r_pipe, r_pipe_cfg, fmt);
+		ret = dpu_plane_atomic_check_pipe(pdpu, r_pipe, r_pipe_cfg, fmt,
+						  &crtc_state->adjusted_mode);
 		if (ret)
 			return ret;
 	}