drm/tilcdc/tilcdc_plane.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2015 Texas Instruments
0004  * Author: Jyri Sarha <jsarha@ti.com>
0005  */
0006
0007 #include <drm/drm_atomic.h>
0008 #include <drm/drm_plane_helper.h>
0009 #include <drm/drm_atomic_helper.h>
0010 #include <drm/drm_fourcc.h>
0011 #include <drm/drm_framebuffer.h>
0012
0013 #include "tilcdc_drv.h"
0014
0015 static const struct drm_plane_funcs tilcdc_plane_funcs = {
0016     .update_plane   = drm_atomic_helper_update_plane,
0017     .disable_plane  = drm_atomic_helper_disable_plane,
0018     .destroy    = drm_plane_cleanup,
0019     .reset      = drm_atomic_helper_plane_reset,
0020     .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
0021     .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
0022 };
0023
0024 static int tilcdc_plane_atomic_check(struct drm_plane *plane,
0025                      struct drm_atomic_state *state)
0026 {
0027     struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
0028                                        plane);
0029     struct drm_crtc_state *crtc_state;
0030     struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state,
0031                                        plane);
0032     unsigned int pitch;
0033
0034     if (!new_state->crtc)
0035         return 0;
0036
0037     if (WARN_ON(!new_state->fb))
0038         return -EINVAL;
0039
0040     if (new_state->crtc_x || new_state->crtc_y) {
0041         dev_err(plane->dev->dev, "%s: crtc position must be zero.",
0042             __func__);
0043         return -EINVAL;
0044     }
0045
0046     crtc_state = drm_atomic_get_existing_crtc_state(state,
0047                             new_state->crtc);
0048     /* we should have a crtc state if the plane is attached to a crtc */
0049     if (WARN_ON(!crtc_state))
0050         return 0;
0051
0052     if (crtc_state->mode.hdisplay != new_state->crtc_w ||
0053         crtc_state->mode.vdisplay != new_state->crtc_h) {
0054         dev_err(plane->dev->dev,
0055             "%s: Size must match mode (%dx%d == %dx%d)", __func__,
0056             crtc_state->mode.hdisplay, crtc_state->mode.vdisplay,
0057             new_state->crtc_w, new_state->crtc_h);
0058         return -EINVAL;
0059     }
0060
0061     pitch = crtc_state->mode.hdisplay *
0062         new_state->fb->format->cpp[0];
0063     if (new_state->fb->pitches[0] != pitch) {
0064         dev_err(plane->dev->dev,
0065             "Invalid pitch: fb and crtc widths must be the same");
0066         return -EINVAL;
0067     }
0068
0069     if (old_state->fb && new_state->fb->format != old_state->fb->format) {
0070         dev_dbg(plane->dev->dev,
0071             "%s(): pixel format change requires mode_change\n",
0072             __func__);
0073         crtc_state->mode_changed = true;
0074     }
0075
0076     return 0;
0077 }
0078
0079 static void tilcdc_plane_atomic_update(struct drm_plane *plane,
0080                        struct drm_atomic_state *state)
0081 {
0082     struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
0083                                        plane);
0084
0085     if (!new_state->crtc)
0086         return;
0087
0088     if (WARN_ON(!new_state->fb || !new_state->crtc->state))
0089         return;
0090
0091     if (tilcdc_crtc_update_fb(new_state->crtc,
0092                   new_state->fb,
0093                   new_state->crtc->state->event) == 0) {
0094         new_state->crtc->state->event = NULL;
0095     }
0096 }
0097
0098 static const struct drm_plane_helper_funcs plane_helper_funcs = {
0099     .atomic_check = tilcdc_plane_atomic_check,
0100     .atomic_update = tilcdc_plane_atomic_update,
0101 };
0102
0103 int tilcdc_plane_init(struct drm_device *dev,
0104               struct drm_plane *plane)
0105 {
0106     struct tilcdc_drm_private *priv = dev->dev_private;
0107     int ret;
0108
0109     ret = drm_plane_init(dev, plane, 1,
0110                  &tilcdc_plane_funcs,
0111                  priv->pixelformats,
0112                  priv->num_pixelformats,
0113                  true);
0114     if (ret) {
0115         dev_err(dev->dev, "Failed to initialize plane: %d\n", ret);
0116         return ret;
0117     }
0118
0119     drm_plane_helper_add(plane, &plane_helper_funcs);
0120
0121     return 0;
0122 }