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 14 static 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 23 static 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 78 static 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 97 static const struct drm_plane_helper_funcs plane_helper_funcs = { 98 .atomic_check = tilcdc_plane_atomic_check, 99 .atomic_update = tilcdc_plane_atomic_update, 100 }; 101 102 int 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 } 122