1 files changed, 224 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imx/dc/dc-plane.c b/drivers/gpu/drm/imx/dc/dc-plane.c
new file mode 100644
index 000000000000..d8b946fb90de
--- /dev/null
+++ b/drivers/gpu/drm/imx/dc/dc-plane.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2024 NXP
+ */
+
+#include <linux/container_of.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_print.h>
+
+#include "dc-drv.h"
+#include "dc-fu.h"
+#include "dc-kms.h"
+
+#define DC_PLANE_MAX_PITCH	0x10000
+#define DC_PLANE_MAX_PIX_CNT	8192
+
+#define dc_plane_dbg(plane, fmt, ...)					\
+do {									\
+	struct drm_plane *_plane = (plane);				\
+	drm_dbg_kms(_plane->dev, "[PLANE:%d:%s] " fmt,			\
+		    _plane->base.id, _plane->name, ##__VA_ARGS__);	\
+} while (0)
+
+static const uint32_t dc_plane_formats[] = {
+	DRM_FORMAT_XRGB8888,
+};
+
+static const struct drm_plane_funcs dc_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy		= drm_plane_cleanup,
+	.reset			= drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static inline struct dc_plane *to_dc_plane(struct drm_plane *plane)
+{
+	return container_of(plane, struct dc_plane, base);
+}
+
+static int dc_plane_check_max_source_resolution(struct drm_plane_state *state)
+{
+	int src_h = drm_rect_height(&state->src) >> 16;
+	int src_w = drm_rect_width(&state->src) >> 16;
+
+	if (src_w > DC_PLANE_MAX_PIX_CNT || src_h > DC_PLANE_MAX_PIX_CNT) {
+		dc_plane_dbg(state->plane, "invalid source resolution\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int dc_plane_check_fb(struct drm_plane_state *state)
+{
+	struct drm_framebuffer *fb = state->fb;
+	dma_addr_t baseaddr = drm_fb_dma_get_gem_addr(fb, state, 0);
+
+	/* base address alignment */
+	if (baseaddr & 0x3) {
+		dc_plane_dbg(state->plane, "fb bad baddr alignment\n");
+		return -EINVAL;
+	}
+
+	/* pitches[0] range */
+	if (fb->pitches[0] > DC_PLANE_MAX_PITCH) {
+		dc_plane_dbg(state->plane, "fb pitches[0] is out of range\n");
+		return -EINVAL;
+	}
+
+	/* pitches[0] alignment */
+	if (fb->pitches[0] & 0x3) {
+		dc_plane_dbg(state->plane, "fb bad pitches[0] alignment\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+dc_plane_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
+{
+	struct drm_plane_state *plane_state =
+				drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc_state *crtc_state;
+	int ret;
+
+	/* ok to disable */
+	if (!plane_state->fb)
+		return 0;
+
+	if (!plane_state->crtc) {
+		dc_plane_dbg(plane, "no CRTC in plane state\n");
+		return -EINVAL;
+	}
+
+	crtc_state =
+		drm_atomic_get_existing_crtc_state(state, plane_state->crtc);
+	if (WARN_ON(!crtc_state))
+		return -EINVAL;
+
+	ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state,
+						  DRM_PLANE_NO_SCALING,
+						  DRM_PLANE_NO_SCALING,
+						  true, false);
+	if (ret) {
+		dc_plane_dbg(plane, "failed to check plane state: %d\n", ret);
+		return ret;
+	}
+
+	ret = dc_plane_check_max_source_resolution(plane_state);
+	if (ret)
+		return ret;
+
+	return dc_plane_check_fb(plane_state);
+}
+
+static void
+dc_plane_atomic_update(struct drm_plane *plane, struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_state =
+				drm_atomic_get_new_plane_state(state, plane);
+	struct dc_plane *dplane = to_dc_plane(plane);
+	struct drm_framebuffer *fb = new_state->fb;
+	const struct dc_fu_ops *fu_ops;
+	struct dc_lb *lb = dplane->lb;
+	struct dc_fu *fu = dplane->fu;
+	dma_addr_t baseaddr;
+	int src_w, src_h;
+	int idx;
+
+	if (!drm_dev_enter(plane->dev, &idx))
+		return;
+
+	src_w = drm_rect_width(&new_state->src) >> 16;
+	src_h = drm_rect_height(&new_state->src) >> 16;
+
+	baseaddr = drm_fb_dma_get_gem_addr(fb, new_state, 0);
+
+	fu_ops = dc_fu_get_ops(dplane->fu);
+
+	fu_ops->set_layerblend(fu, lb);
+	fu_ops->set_burstlength(fu, baseaddr);
+	fu_ops->set_src_stride(fu, DC_FETCHUNIT_FRAC0, fb->pitches[0]);
+	fu_ops->set_src_buf_dimensions(fu, DC_FETCHUNIT_FRAC0, src_w, src_h);
+	fu_ops->set_fmt(fu, DC_FETCHUNIT_FRAC0, fb->format);
+	fu_ops->set_framedimensions(fu, src_w, src_h);
+	fu_ops->set_baseaddress(fu, DC_FETCHUNIT_FRAC0, baseaddr);
+	fu_ops->enable_src_buf(fu, DC_FETCHUNIT_FRAC0);
+
+	dc_plane_dbg(plane, "uses %s\n", fu_ops->get_name(fu));
+
+	dc_lb_pec_dynamic_prim_sel(lb, dc_cf_get_link_id(dplane->cf));
+	dc_lb_pec_dynamic_sec_sel(lb, fu_ops->get_link_id(fu));
+	dc_lb_mode(lb, LB_BLEND);
+	dc_lb_position(lb, new_state->dst.x1, new_state->dst.y1);
+	dc_lb_pec_clken(lb, CLKEN_AUTOMATIC);
+
+	dc_plane_dbg(plane, "uses LayerBlend%d\n", dc_lb_get_id(lb));
+
+	/* set ExtDst's source to LayerBlend */
+	dc_ed_pec_src_sel(dplane->ed, dc_lb_get_link_id(lb));
+
+	drm_dev_exit(idx);
+}
+
+static void dc_plane_atomic_disable(struct drm_plane *plane,
+				    struct drm_atomic_state *state)
+{
+	struct dc_plane *dplane = to_dc_plane(plane);
+	const struct dc_fu_ops *fu_ops;
+	int idx;
+
+	if (!drm_dev_enter(plane->dev, &idx))
+		return;
+
+	/* disable fetchunit in shadow */
+	fu_ops = dc_fu_get_ops(dplane->fu);
+	fu_ops->disable_src_buf(dplane->fu, DC_FETCHUNIT_FRAC0);
+
+	/* set ExtDst's source to ConstFrame */
+	dc_ed_pec_src_sel(dplane->ed, dc_cf_get_link_id(dplane->cf));
+
+	drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs dc_plane_helper_funcs = {
+	.atomic_check = dc_plane_atomic_check,
+	.atomic_update = dc_plane_atomic_update,
+	.atomic_disable = dc_plane_atomic_disable,
+};
+
+int dc_plane_init(struct dc_drm_device *dc_drm, struct dc_plane *dc_plane)
+{
+	struct drm_plane *plane = &dc_plane->base;
+	int ret;
+
+	ret = drm_universal_plane_init(&dc_drm->base, plane, 0, &dc_plane_funcs,
+				       dc_plane_formats,
+				       ARRAY_SIZE(dc_plane_formats),
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ret;
+
+	drm_plane_helper_add(plane, &dc_plane_helper_funcs);
+
+	dc_plane->fu = dc_drm->pe->fu_disp[plane->index];
+	dc_plane->cf = dc_drm->pe->cf_cont[plane->index];
+	dc_plane->lb = dc_drm->pe->lb[plane->index];
+	dc_plane->ed = dc_drm->pe->ed_cont[plane->index];
+
+	return 0;
+}