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 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_plane_state *state)
 25{
 26	struct drm_crtc_state *crtc_state;
 27	struct drm_plane_state *old_state = plane->state;
 28	unsigned int pitch;
 29
 30	if (!state->crtc)
 31		return 0;
 32
 33	if (WARN_ON(!state->fb))
 34		return -EINVAL;
 35
 36	if (state->crtc_x || state->crtc_y) {
 37		dev_err(plane->dev->dev, "%s: crtc position must be zero.",
 38			__func__);
 39		return -EINVAL;
 40	}
 41
 42	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
 43							state->crtc);
 44	/* we should have a crtc state if the plane is attached to a crtc */
 45	if (WARN_ON(!crtc_state))
 46		return 0;
 47
 48	if (crtc_state->mode.hdisplay != state->crtc_w ||
 49	    crtc_state->mode.vdisplay != state->crtc_h) {
 50		dev_err(plane->dev->dev,
 51			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
 52			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
 53			state->crtc_w, state->crtc_h);
 54		return -EINVAL;
 55	}
 56
 57	pitch = crtc_state->mode.hdisplay *
 58		state->fb->format->cpp[0];
 59	if (state->fb->pitches[0] != pitch) {
 60		dev_err(plane->dev->dev,
 61			"Invalid pitch: fb and crtc widths must be the same");
 62		return -EINVAL;
 63	}
 64
 65	if (state->fb && old_state->fb &&
 66	    state->fb->format != old_state->fb->format) {
 67		dev_dbg(plane->dev->dev,
 68			"%s(): pixel format change requires mode_change\n",
 69			__func__);
 70		crtc_state->mode_changed = true;
 71	}
 72
 73	return 0;
 74}
 75
 76static void tilcdc_plane_atomic_update(struct drm_plane *plane,
 77				       struct drm_plane_state *old_state)
 78{
 79	struct drm_plane_state *state = plane->state;
 80
 81	if (!state->crtc)
 82		return;
 83
 84	if (WARN_ON(!state->fb || !state->crtc->state))
 85		return;
 86
 87	tilcdc_crtc_update_fb(state->crtc,
 88			      state->fb,
 89			      state->crtc->state->event);
 90}
 91
 92static const struct drm_plane_helper_funcs plane_helper_funcs = {
 93	.atomic_check = tilcdc_plane_atomic_check,
 94	.atomic_update = tilcdc_plane_atomic_update,
 95};
 96
 97int tilcdc_plane_init(struct drm_device *dev,
 98		      struct drm_plane *plane)
 99{
100	struct tilcdc_drm_private *priv = dev->dev_private;
101	int ret;
102
103	ret = drm_plane_init(dev, plane, 1,
104			     &tilcdc_plane_funcs,
105			     priv->pixelformats,
106			     priv->num_pixelformats,
107			     true);
108	if (ret) {
109		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
110		return ret;
111	}
112
113	drm_plane_helper_add(plane, &plane_helper_funcs);
114
115	return 0;
116}