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 };
  32
  33 static void mtk_plane_enable(struct mtk_drm_plane *mtk_plane, bool enable,
  34                              dma_addr_t addr, struct drm_rect *dest)
  35 {
  36         struct drm_plane *plane = &mtk_plane->base;
  37         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
  38         unsigned int pitch, format;
  39         int x, y;
  40
  41         if (WARN_ON(!plane->state || (enable && !plane->state->fb)))
  42                 return;
  43
  44         if (plane->state->fb) {
  45                 pitch = plane->state->fb->pitches[0];
  46                 format = plane->state->fb->pixel_format;
  47         } else {
  48                 pitch = 0;
  49                 format = DRM_FORMAT_RGBA8888;
  50         }
  51
  52         x = plane->state->crtc_x;
  53         y = plane->state->crtc_y;
  54
  55         if (x < 0) {
  56                 addr -= x * 4;
  57                 x = 0;
  58         }
  59
  60         if (y < 0) {
  61                 addr -= y * pitch;
  62                 y = 0;
  63         }
  64
  65         state->pending.enable = enable;
  66         state->pending.pitch = pitch;
  67         state->pending.format = format;
  68         state->pending.addr = addr;
  69         state->pending.x = x;
  70         state->pending.y = y;
  71         state->pending.width = dest->x2 - dest->x1;
  72         state->pending.height = dest->y2 - dest->y1;
  73         wmb(); /* Make sure the above parameters are set before update */
  74         state->pending.dirty = true;
  75 }
  76
  77 static void mtk_plane_reset(struct drm_plane *plane)
  78 {
  79         struct mtk_plane_state *state;
  80
  81         if (plane->state) {
  82                 if (plane->state->fb)
  83                         drm_framebuffer_unreference(plane->state->fb);
  84
  85                 state = to_mtk_plane_state(plane->state);
  86                 memset(state, 0, sizeof(*state));
  87         } else {
  88                 state = kzalloc(sizeof(*state), GFP_KERNEL);
  89                 if (!state)
  90                         return;
  91                 plane->state = &state->base;
  92         }
  93
  94         state->base.plane = plane;
  95         state->pending.format = DRM_FORMAT_RGB565;
  96 }
  97
  98 static struct drm_plane_state *mtk_plane_duplicate_state(struct drm_plane *plane)
  99 {
 100         struct mtk_plane_state *old_state = to_mtk_plane_state(plane->state);
 101         struct mtk_plane_state *state;
 102
 103         state = kzalloc(sizeof(*state), GFP_KERNEL);
 104         if (!state)
 105                 return NULL;
 106
 107         __drm_atomic_helper_plane_duplicate_state(plane, &state->base);
 108
 109         WARN_ON(state->base.plane != plane);
 110
 111         state->pending = old_state->pending;
 112
 113         return &state->base;
 114 }
 115
 116 static void mtk_drm_plane_destroy_state(struct drm_plane *plane,
 117                                         struct drm_plane_state *state)
 118 {
 119         __drm_atomic_helper_plane_destroy_state(state);
 120         kfree(to_mtk_plane_state(state));
 121 }
 122
 123 static const struct drm_plane_funcs mtk_plane_funcs = {
 124         .update_plane = drm_atomic_helper_update_plane,
 125         .disable_plane = drm_atomic_helper_disable_plane,
 126         .destroy = drm_plane_cleanup,
 127         .reset = mtk_plane_reset,
 128         .atomic_duplicate_state = mtk_plane_duplicate_state,
 129         .atomic_destroy_state = mtk_drm_plane_destroy_state,
 130 };
 131
 132 static int mtk_plane_atomic_check(struct drm_plane *plane,
 133                                   struct drm_plane_state *state)
 134 {
 135         struct drm_framebuffer *fb = state->fb;
 136         struct drm_crtc_state *crtc_state;
 137         bool visible;
 138         struct drm_rect dest = {
 139                 .x1 = state->crtc_x,
 140                 .y1 = state->crtc_y,
 141                 .x2 = state->crtc_x + state->crtc_w,
 142                 .y2 = state->crtc_y + state->crtc_h,
 143         };
 144         struct drm_rect src = {
 145                 /* 16.16 fixed point */
 146                 .x1 = state->src_x,
 147                 .y1 = state->src_y,
 148                 .x2 = state->src_x + state->src_w,
 149                 .y2 = state->src_y + state->src_h,
 150         };
 151         struct drm_rect clip = { 0, };
 152
 153         if (!fb)
 154                 return 0;
 155
 156         if (!mtk_fb_get_gem_obj(fb)) {
 157                 DRM_DEBUG_KMS("buffer is null\n");
 158                 return -EFAULT;
 159         }
 160
 161         if (!state->crtc)
 162                 return 0;
 163
 164         crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
 165         if (IS_ERR(crtc_state))
 166                 return PTR_ERR(crtc_state);
 167
 168         clip.x2 = crtc_state->mode.hdisplay;
 169         clip.y2 = crtc_state->mode.vdisplay;
 170
 171         return drm_plane_helper_check_update(plane, state->crtc, fb,
 172                                              &src, &dest, &clip,
 173                                              state->rotation,
 174                                              DRM_PLANE_HELPER_NO_SCALING,
 175                                              DRM_PLANE_HELPER_NO_SCALING,
 176                                              true, true, &visible);
 177 }
 178
 179 static void mtk_plane_atomic_update(struct drm_plane *plane,
 180                                     struct drm_plane_state *old_state)
 181 {
 182         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 183         struct drm_crtc *crtc = state->base.crtc;
 184         struct drm_gem_object *gem;
 185         struct mtk_drm_gem_obj *mtk_gem;
 186         struct mtk_drm_plane *mtk_plane = to_mtk_plane(plane);
 187         struct drm_rect dest = {
 188                 .x1 = state->base.crtc_x,
 189                 .y1 = state->base.crtc_y,
 190                 .x2 = state->base.crtc_x + state->base.crtc_w,
 191                 .y2 = state->base.crtc_y + state->base.crtc_h,
 192         };
 193         struct drm_rect clip = { 0, };
 194
 195         if (!crtc)
 196                 return;
 197
 198         clip.x2 = state->base.crtc->state->mode.hdisplay;
 199         clip.y2 = state->base.crtc->state->mode.vdisplay;
 200         drm_rect_intersect(&dest, &clip);
 201
 202         gem = mtk_fb_get_gem_obj(state->base.fb);
 203         mtk_gem = to_mtk_gem_obj(gem);
 204         mtk_plane_enable(mtk_plane, true, mtk_gem->dma_addr, &dest);
 205 }
 206
 207 static void mtk_plane_atomic_disable(struct drm_plane *plane,
 208                                      struct drm_plane_state *old_state)
 209 {
 210         struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
 211
 212         state->pending.enable = false;
 213         wmb(); /* Make sure the above parameter is set before update */
 214         state->pending.dirty = true;
 215 }
 216
 217 static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
 218         .atomic_check = mtk_plane_atomic_check,
 219         .atomic_update = mtk_plane_atomic_update,
 220         .atomic_disable = mtk_plane_atomic_disable,
 221 };
 222
 223 int mtk_plane_init(struct drm_device *dev, struct mtk_drm_plane *mtk_plane,
 224                    unsigned long possible_crtcs, enum drm_plane_type type,
 225                    unsigned int zpos)
 226 {
 227         int err;
 228
 229         err = drm_universal_plane_init(dev, &mtk_plane->base, possible_crtcs,
 230                                        &mtk_plane_funcs, formats,
 231                                        ARRAY_SIZE(formats), type, NULL);
 232         if (err) {
 233                 DRM_ERROR("failed to initialize plane\n");
 234                 return err;
 235         }
 236
 237         drm_plane_helper_add(&mtk_plane->base, &mtk_plane_helper_funcs);
 238         mtk_plane->idx = zpos;
 239
 240         return 0;
 241 }