tilcdc_plane.c

  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_atomic_helper.h>
  9#include <drm/drm_fourcc.h>
 10#include <drm/drm_framebuffer.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_new_crtc_state(state, new_state->crtc);
 46	/* we should have a crtc state if the plane is attached to a crtc */
 47	if (WARN_ON(!crtc_state))
 48		return 0;
 49
 50	if (crtc_state->mode.hdisplay != new_state->crtc_w ||
 51	    crtc_state->mode.vdisplay != new_state->crtc_h) {
 52		dev_err(plane->dev->dev,
 53			"%s: Size must match mode (%dx%d == %dx%d)", __func__,
 54			crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
 55			new_state->crtc_w, new_state->crtc_h);
 56		return -EINVAL;
 57	}
 58
 59	pitch = crtc_state->mode.hdisplay *
 60		new_state->fb->format->cpp[0];
 61	if (new_state->fb->pitches[0] != pitch) {
 62		dev_err(plane->dev->dev,
 63			"Invalid pitch: fb and crtc widths must be the same");
 64		return -EINVAL;
 65	}
 66
 67	if (old_state->fb && new_state->fb->format != old_state->fb->format) {
 68		dev_dbg(plane->dev->dev,
 69			"%s(): pixel format change requires mode_change\n",
 70			__func__);
 71		crtc_state->mode_changed = true;
 72	}
 73
 74	return 0;
 75}
 76
 77static void tilcdc_plane_atomic_update(struct drm_plane *plane,
 78				       struct drm_atomic_state *state)
 79{
 80	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 81									   plane);
 82
 83	if (!new_state->crtc)
 84		return;
 85
 86	if (WARN_ON(!new_state->fb || !new_state->crtc->state))
 87		return;
 88
 89	if (tilcdc_crtc_update_fb(new_state->crtc,
 90				  new_state->fb,
 91				  new_state->crtc->state->event) == 0) {
 92		new_state->crtc->state->event = NULL;
 93	}
 94}
 95
 96static const struct drm_plane_helper_funcs plane_helper_funcs = {
 97	.atomic_check = tilcdc_plane_atomic_check,
 98	.atomic_update = tilcdc_plane_atomic_update,
 99};
100
101int tilcdc_plane_init(struct drm_device *dev,
102		      struct drm_plane *plane)
103{
104	struct tilcdc_drm_private *priv = dev->dev_private;
105	int ret;
106
107	ret = drm_universal_plane_init(dev, plane, 1, &tilcdc_plane_funcs,
108				       priv->pixelformats,
109				       priv->num_pixelformats,
110				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
111	if (ret) {
112		dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
113		return ret;
114	}
115
116	drm_plane_helper_add(plane, &plane_helper_funcs);
117
118	return 0;
119}