1/*
  2 * Copyright (C) 2015 Texas Instruments
  3 * Author: Jyri Sarha <jsarha@ti.com>
  4 *
  5 * This program is free software; you can redistribute it and/or modify it
  6 * under the terms of the GNU General Public License version 2 as published by
  7 * the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it will be useful, but WITHOUT
 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 12 * more details.
 13 *
 14 * You should have received a copy of the GNU General Public License along with
 15 * this program.  If not, see <http://www.gnu.org/licenses/>.
 16 */
 17
 18#include <drm/drmP.h>
 19
 20#include <drm/drm_atomic.h>
 21#include <drm/drm_plane_helper.h>
 22#include <drm/drm_atomic_helper.h>
 23#include <uapi/drm/drm_fourcc.h>
 24
 25#include "tilcdc_drv.h"
 26
 27static struct drm_plane_funcs tilcdc_plane_funcs = {
 28	.update_plane	= drm_atomic_helper_update_plane,
 29	.disable_plane	= drm_atomic_helper_disable_plane,
 30	.destroy	= drm_plane_cleanup,
 31	.reset		= drm_atomic_helper_plane_reset,
 32	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
 33	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 34};
 35
 36static int tilcdc_plane_atomic_check(struct drm_plane *plane,
 37				     struct drm_plane_state *state)
 38{
 39	struct drm_crtc_state *crtc_state;
 40	struct drm_plane_state *old_state = plane->state;
 41	unsigned int pitch;
 42
 43	if (!state->crtc)
 44		return 0;
 45
 46	if (WARN_ON(!state->fb))
 47		return -EINVAL;
 48
 49	if (state->crtc_x || state->crtc_y) {
 50		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
 51			__func__);
 52		return -EINVAL;
 53	}
 54
 55	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 56							state->crtc);
 57	/* we should have a crtc state if the plane is attached to a crtc */
 58	if (WARN_ON(!crtc_state))
 59		return 0;
 60
 61	if (crtc_state->mode.hdisplay != state->crtc_w ||
 62	    crtc_state->mode.vdisplay != state->crtc_h) {
 63		dev_err(plane->dev->dev,
 64			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
 65			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
 66			state->crtc_w, state->crtc_h);
 67		return -EINVAL;
 68	}
 69
 70	pitch = crtc_state->mode.hdisplay *
 71		state->fb->format->cpp[0];
 72	if (state->fb->pitches[0] != pitch) {
 73		dev_err(plane->dev->dev,
 74			"Invalid pitch: fb and crtc widths must be the same");
 75		return -EINVAL;
 76	}
 77
 78	if (state->fb && old_state->fb &&
 79	    state->fb->format != old_state->fb->format) {
 80		dev_dbg(plane->dev->dev,
 81			"%s(): pixel format change requires mode_change\n",
 82			__func__);
 83		crtc_state->mode_changed = true;
 84	}
 85
 86	return 0;
 87}
 88
 89static void tilcdc_plane_atomic_update(struct drm_plane *plane,
 90				       struct drm_plane_state *old_state)
 91{
 92	struct drm_plane_state *state = plane->state;
 93
 94	if (!state->crtc)
 95		return;
 96
 97	if (WARN_ON(!state->fb || !state->crtc->state))
 98		return;
 99
100	tilcdc_crtc_update_fb(state->crtc,
101			      state->fb,
102			      state->crtc->state->event);
103}
104
105static const struct drm_plane_helper_funcs plane_helper_funcs = {
106	.atomic_check = tilcdc_plane_atomic_check,
107	.atomic_update = tilcdc_plane_atomic_update,
108};
109
110int tilcdc_plane_init(struct drm_device *dev,
111		      struct drm_plane *plane)
112{
113	struct tilcdc_drm_private *priv = dev->dev_private;
114	int ret;
115
116	ret = drm_plane_init(dev, plane, 1,
117			     &tilcdc_plane_funcs,
118			     priv->pixelformats,
119			     priv->num_pixelformats,
120			     true);
121	if (ret) {
122		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
123		return ret;
124	}
125
126	drm_plane_helper_add(plane, &plane_helper_funcs);
127
128	return 0;
129}