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 = plane->state; 30 unsigned int pitch; 31 32 if (!new_state->crtc) 33 return 0; 34 35 if (WARN_ON(!new_state->fb)) 36 return -EINVAL; 37 38 if (new_state->crtc_x || new_state->crtc_y) { 39 dev_err(plane->dev->dev, "%s: crtc position must be zero.", 40 __func__); 41 return -EINVAL; 42 } 43 44 crtc_state = drm_atomic_get_existing_crtc_state(new_state->state, 45 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 77 static void tilcdc_plane_atomic_update(struct drm_plane *plane, 78 struct drm_plane_state *old_state) 79 { 80 struct drm_plane_state *state = plane->state; 81 82 if (!state->crtc) 83 return; 84 85 if (WARN_ON(!state->fb || !state->crtc->state)) 86 return; 87 88 if (tilcdc_crtc_update_fb(state->crtc, 89 state->fb, 90 state->crtc->state->event) == 0) { 91 state->crtc->state->event = NULL; 92 } 93 } 94 95 static const struct drm_plane_helper_funcs plane_helper_funcs = { 96 .atomic_check = tilcdc_plane_atomic_check, 97 .atomic_update = tilcdc_plane_atomic_update, 98 }; 99 100 int tilcdc_plane_init(struct drm_device *dev, 101 struct drm_plane *plane) 102 { 103 struct tilcdc_drm_private *priv = dev->dev_private; 104 int ret; 105 106 ret = drm_plane_init(dev, plane, 1, 107 &tilcdc_plane_funcs, 108 priv->pixelformats, 109 priv->num_pixelformats, 110 true); 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 } 120