1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2015 Texas Instruments
  4 * Author: Jyri Sarha <jsarha@ti.com>
  5 */
  6
  7#include <drm/drm_atomic.h>
  8#include <drm/drm_plane_helper.h>
  9#include <drm/drm_atomic_helper.h>
 10#include <drm/drm_fourcc.h>
 11
 12#include "tilcdc_drv.h"
 13
 14static const struct drm_plane_funcs tilcdc_plane_funcs = {
 15	.update_plane	= drm_atomic_helper_update_plane,
 16	.disable_plane	= drm_atomic_helper_disable_plane,
 17	.destroy	= drm_plane_cleanup,
 18	.reset		= drm_atomic_helper_plane_reset,
 19	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 20	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 21};
 22
 23static int tilcdc_plane_atomic_check(struct drm_plane *plane,
 24				     struct drm_atomic_state *state)
 25{
 26	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 27									   plane);
 28	struct drm_crtc_state *crtc_state;
 29	struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
 30									   plane);
 31	unsigned int pitch;
 32
 33	if (!new_state->crtc)
 34		return 0;
 35
 36	if (WARN_ON(!new_state->fb))
 37		return -EINVAL;
 38
 39	if (new_state->crtc_x || new_state->crtc_y) {
 40		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
 41			__func__);
 42		return -EINVAL;
 43	}
 44
 45	crtc_state = drm_atomic_get_existing_crtc_state(state,
 46							new_state->crtc);
 47	/* we should have a crtc state if the plane is attached to a crtc */
 48	if (WARN_ON(!crtc_state))
 49		return 0;
 50
 51	if (crtc_state->mode.hdisplay != new_state->crtc_w ||
 52	    crtc_state->mode.vdisplay != new_state->crtc_h) {
 53		dev_err(plane->dev->dev,
 54			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
 55			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
 56			new_state->crtc_w, new_state->crtc_h);
 57		return -EINVAL;
 58	}
 59
 60	pitch = crtc_state->mode.hdisplay *
 61		new_state->fb->format->cpp[0];
 62	if (new_state->fb->pitches[0] != pitch) {
 63		dev_err(plane->dev->dev,
 64			"Invalid pitch: fb and crtc widths must be the same");
 65		return -EINVAL;
 66	}
 67
 68	if (old_state->fb && new_state->fb->format != old_state->fb->format) {
 69		dev_dbg(plane->dev->dev,
 70			"%s(): pixel format change requires mode_change\n",
 71			__func__);
 72		crtc_state->mode_changed = true;
 73	}
 74
 75	return 0;
 76}
 77
 78static void tilcdc_plane_atomic_update(struct drm_plane *plane,
 79				       struct drm_atomic_state *state)
 80{
 81	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 82									   plane);
 83
 84	if (!new_state->crtc)
 85		return;
 86
 87	if (WARN_ON(!new_state->fb || !new_state->crtc->state))
 88		return;
 89
 90	if (tilcdc_crtc_update_fb(new_state->crtc,
 91				  new_state->fb,
 92				  new_state->crtc->state->event) == 0) {
 93		new_state->crtc->state->event = NULL;
 94	}
 95}
 96
 97static const struct drm_plane_helper_funcs plane_helper_funcs = {
 98	.atomic_check = tilcdc_plane_atomic_check,
 99	.atomic_update = tilcdc_plane_atomic_update,
100};
101
102int tilcdc_plane_init(struct drm_device *dev,
103		      struct drm_plane *plane)
104{
105	struct tilcdc_drm_private *priv = dev->dev_private;
106	int ret;
107
108	ret = drm_plane_init(dev, plane, 1,
109			     &tilcdc_plane_funcs,
110			     priv->pixelformats,
111			     priv->num_pixelformats,
112			     true);
113	if (ret) {
114		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
115		return ret;
116	}
117
118	drm_plane_helper_add(plane, &plane_helper_funcs);
119
120	return 0;
121}