drm/msm/dpu: drop EAGAIN check from dpu_format_populate_layout

The pipe's layout is not cached, corresponding data structure is zeroed
out each time in the dpu_plane_sspp_atomic_update(), right before the
call to _dpu_plane_set_scanout() -> dpu_format_populate_layout().

Drop plane_addr comparison against previous layout and corresponding
EAGAIN handling.
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Tested-by: Abhinav Kumar <quic_abhinavk@quicinc.com> # sc7280
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/527314/
Link: https://lore.kernel.org/r/20230316161653.4106395-5-dmitry.baryshkov@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

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

@@ -929,8 +929,7 @@ int dpu_format_populate_layout(
 		struct drm_framebuffer *fb,
 		struct dpu_hw_fmt_layout *layout)
 {
-	uint32_t plane_addr[DPU_MAX_PLANES];
-	int i, ret;
+	int ret;
 
 	if (!fb || !layout) {
 		DRM_ERROR("invalid arguments\n");
@@ -951,9 +950,6 @@ int dpu_format_populate_layout(
 	if (ret)
 		return ret;
 
-	for (i = 0; i < DPU_MAX_PLANES; ++i)
-		plane_addr[i] = layout->plane_addr[i];
-
 	/* Populate the addresses given the fb */
 	if (DPU_FORMAT_IS_UBWC(layout->format) ||
 			DPU_FORMAT_IS_TILE(layout->format))
@@ -961,10 +957,6 @@ int dpu_format_populate_layout(
 	else
 		ret = _dpu_format_populate_addrs_linear(aspace, fb, layout);
 
-	/* check if anything changed */
-	if (!ret && !memcmp(plane_addr, layout->plane_addr, sizeof(plane_addr)))
-		ret = -EAGAIN;
-
 	return ret;
 }
 

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

@@ -477,9 +477,7 @@ static void _dpu_plane_set_scanout(struct drm_plane *plane,
 	int ret;
 
 	ret = dpu_format_populate_layout(aspace, fb, &pipe_cfg->layout);
-	if (ret == -EAGAIN)
-		DPU_DEBUG_PLANE(pdpu, "not updating same src addrs\n");
-	else if (ret)
+	if (ret)
 		DPU_ERROR_PLANE(pdpu, "failed to get format layout, %d\n", ret);
 	else if (pdpu->pipe_hw->ops.setup_sourceaddress) {
 		trace_dpu_plane_set_scanout(pdpu->pipe_hw->idx,