drivers/gpu/drm/mediatek/mtk_drm_plane.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  * Author: CK Hu <ck.hu@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_plane_helper.h>
  19
  20 #include "mtk_drm_crtc.h"
  21 #include "mtk_drm_ddp_comp.h"
  22 #include "mtk_drm_drv.h"
  23 #include "mtk_drm_fb.h"
  24 #include "mtk_drm_gem.h"
  25 #include "mtk_drm_plane.h"
  26
  27 static const u32 formats[] = {
  28         DRM_FORMAT_XRGB8888,
  29         DRM_FORMAT_ARGB8888,
  30         DRM_FORMAT_RGB565,
  31         DRM_FORMAT_UYVY,
  32         DRM_FORMAT_YUYV,
  33 };
  34
  35 static void mtk_plane_reset(struct drm_plane *plane)
  36 {
  37         struct mtk_plane_state *state;
  38
  39         if (plane->state) {
  40                 __drm_atomic_helper_plane_destroy_state(plane->state);
  41
  42                 state = to_mtk_plane_state(plane->state);
  43                 memset(state, 0, sizeof(*state));
  44         } else {
  45                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  46                 if (!state)
  47                         return;
  48                 plane->state = &state->base;
  49         }
  50
  51         state->base.plane = plane;
  52         state->pending.format = DRM_FORMAT_RGB565;
  53 }
  54
  55 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  56 {
  57         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
  58         struct mtk_plane_state *state;
  59
  60         state = kzalloc(sizeof(*state), GFP_KERNEL);
  61         if (!state)
  62                 return NULL;
  63
  64         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
  65
  66         WARN_ON(state->base.plane != plane);
  67
  68         state->pending = old_state->pending;
  69
  70         return &state->base;
  71 }
  72
  73 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
  74                                         struct drm_plane_state *state)
  75 {
  76         __drm_atomic_helper_plane_destroy_state(state);
  77         kfree(to_mtk_plane_state(state));
  78 }
  79
  80 static const struct drm_plane_funcs mtk_plane_funcs = {
  81         .update_plane = drm_atomic_helper_update_plane,
  82         .disable_plane = drm_atomic_helper_disable_plane,
  83         .destroy = drm_plane_cleanup,
  84         .reset = mtk_plane_reset,
  85         .atomic_duplicate_state = mtk_plane_duplicate_state,
  86         .atomic_destroy_state = mtk_drm_plane_destroy_state,
  87 };
  88
  89 static int mtk_plane_atomic_check(struct drm_plane *plane,
  90                                   struct drm_plane_state *state)
  91 {
  92         struct drm_framebuffer *fb = state->fb;
  93         struct drm_crtc_state *crtc_state;
  94
  95         if (!fb)
  96                 return 0;
  97
  98         if (!state->crtc)
  99                 return 0;
 100
 101         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
 102         if (IS_ERR(crtc_state))
 103                 return PTR_ERR(crtc_state);
 104
 105         return drm_atomic_helper_check_plane_state(state, crtc_state,
 106                                                    DRM_PLANE_HELPER_NO_SCALING,
 107                                                    DRM_PLANE_HELPER_NO_SCALING,
 108                                                    true, true);
 109 }
 110
 111 static void mtk_plane_atomic_update(struct drm_plane *plane,
 112                                     struct drm_plane_state *old_state)
 113 {
 114         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 115         struct drm_crtc *crtc = plane->state->crtc;
 116         struct drm_framebuffer *fb = plane->state->fb;
 117         struct drm_gem_object *gem;
 118         struct mtk_drm_gem_obj *mtk_gem;
 119         unsigned int pitch, format;
 120         dma_addr_t addr;
 121
 122         if (!crtc || WARN_ON(!fb))
 123                 return;
 124
 125         gem = fb->obj[0];
 126         mtk_gem = to_mtk_gem_obj(gem);
 127         addr = mtk_gem->dma_addr;
 128         pitch = fb->pitches[0];
 129         format = fb->format->format;
 130
 131         addr += (plane->state->src.x1 >> 16) * fb->format->cpp[0];
 132         addr += (plane->state->src.y1 >> 16) * pitch;
 133
 134         state->pending.enable = true;
 135         state->pending.pitch = pitch;
 136         state->pending.format = format;
 137         state->pending.addr = addr;
 138         state->pending.x = plane->state->dst.x1;
 139         state->pending.y = plane->state->dst.y1;
 140         state->pending.width = drm_rect_width(&plane->state->dst);
 141         state->pending.height = drm_rect_height(&plane->state->dst);
 142         wmb(); /* Make sure the above parameters are set before update */
 143         state->pending.dirty = true;
 144 }
 145
 146 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 147                                      struct drm_plane_state *old_state)
 148 {
 149         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 150
 151         state->pending.enable = false;
 152         wmb(); /* Make sure the above parameter is set before update */
 153         state->pending.dirty = true;
 154 }
 155
 156 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 157         .atomic_check = mtk_plane_atomic_check,
 158         .atomic_update = mtk_plane_atomic_update,
 159         .atomic_disable = mtk_plane_atomic_disable,
 160 };
 161
 162 int mtk_plane_init(struct drm_device *dev, struct drm_plane *plane,
 163                    unsigned long possible_crtcs, enum drm_plane_type type)
 164 {
 165         int err;
 166
 167         err = drm_universal_plane_init(dev, plane, possible_crtcs,
 168                                        &mtk_plane_funcs, formats,
 169                                        ARRAY_SIZE(formats), NULL, type, NULL);
 170         if (err) {
 171                 DRM_ERROR("failed to initialize plane\n");
 172                 return err;
 173         }
 174
 175         drm_plane_helper_add(plane, &mtk_plane_helper_funcs);
 176
 177         return 0;
 178 }