drivers/gpu/drm/rockchip/rockchip_drm_fb.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * This software is licensed under the terms of the GNU General Public
   6  * License version 2, as published by the Free Software Foundation, and
   7  * may be copied, distributed, and modified under those terms.
   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 <linux/kernel.h>
  16 #include <drm/drm.h>
  17 #include <drm/drmP.h>
  18 #include <drm/drm_atomic.h>
  19 #include <drm/drm_fb_helper.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include <drm/drm_gem_framebuffer_helper.h>
  22
  23 #include "rockchip_drm_drv.h"
  24 #include "rockchip_drm_fb.h"
  25 #include "rockchip_drm_gem.h"
  26 #include "rockchip_drm_psr.h"
  27
  28 static int rockchip_drm_fb_dirty(struct drm_framebuffer *fb,
  29                                  struct drm_file *file,
  30                                  unsigned int flags, unsigned int color,
  31                                  struct drm_clip_rect *clips,
  32                                  unsigned int num_clips)
  33 {
  34         rockchip_drm_psr_flush_all(fb->dev);
  35         return 0;
  36 }
  37
  38 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
  39         .destroy       = drm_gem_fb_destroy,
  40         .create_handle = drm_gem_fb_create_handle,
  41         .dirty         = rockchip_drm_fb_dirty,
  42 };
  43
  44 static struct drm_framebuffer *
  45 rockchip_fb_alloc(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd,
  46                   struct drm_gem_object **obj, unsigned int num_planes)
  47 {
  48         struct drm_framebuffer *fb;
  49         int ret;
  50         int i;
  51
  52         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
  53         if (!fb)
  54                 return ERR_PTR(-ENOMEM);
  55
  56         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
  57
  58         for (i = 0; i < num_planes; i++)
  59                 fb->obj[i] = obj[i];
  60
  61         ret = drm_framebuffer_init(dev, fb, &rockchip_drm_fb_funcs);
  62         if (ret) {
  63                 DRM_DEV_ERROR(dev->dev,
  64                               "Failed to initialize framebuffer: %d\n",
  65                               ret);
  66                 kfree(fb);
  67                 return ERR_PTR(ret);
  68         }
  69
  70         return fb;
  71 }
  72
  73 static struct drm_framebuffer *
  74 rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
  75                         const struct drm_mode_fb_cmd2 *mode_cmd)
  76 {
  77         struct drm_framebuffer *fb;
  78         struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
  79         struct drm_gem_object *obj;
  80         unsigned int hsub;
  81         unsigned int vsub;
  82         int num_planes;
  83         int ret;
  84         int i;
  85
  86         hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
  87         vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
  88         num_planes = min(drm_format_num_planes(mode_cmd->pixel_format),
  89                          ROCKCHIP_MAX_FB_BUFFER);
  90
  91         for (i = 0; i < num_planes; i++) {
  92                 unsigned int width = mode_cmd->width / (i ? hsub : 1);
  93                 unsigned int height = mode_cmd->height / (i ? vsub : 1);
  94                 unsigned int min_size;
  95
  96                 obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
  97                 if (!obj) {
  98                         DRM_DEV_ERROR(dev->dev,
  99                                       "Failed to lookup GEM object\n");
 100                         ret = -ENXIO;
 101                         goto err_gem_object_unreference;
 102                 }
 103
 104                 min_size = (height - 1) * mode_cmd->pitches[i] +
 105                         mode_cmd->offsets[i] +
 106                         width * drm_format_plane_cpp(mode_cmd->pixel_format, i);
 107
 108                 if (obj->size < min_size) {
 109                         drm_gem_object_put_unlocked(obj);
 110                         ret = -EINVAL;
 111                         goto err_gem_object_unreference;
 112                 }
 113                 objs[i] = obj;
 114         }
 115
 116         fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
 117         if (IS_ERR(fb)) {
 118                 ret = PTR_ERR(fb);
 119                 goto err_gem_object_unreference;
 120         }
 121
 122         return fb;
 123
 124 err_gem_object_unreference:
 125         for (i--; i >= 0; i--)
 126                 drm_gem_object_put_unlocked(objs[i]);
 127         return ERR_PTR(ret);
 128 }
 129
 130 static void
 131 rockchip_drm_psr_inhibit_get_state(struct drm_atomic_state *state)
 132 {
 133         struct drm_crtc *crtc;
 134         struct drm_crtc_state *crtc_state;
 135         struct drm_encoder *encoder;
 136         u32 encoder_mask = 0;
 137         int i;
 138
 139         for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
 140                 encoder_mask |= crtc_state->encoder_mask;
 141                 encoder_mask |= crtc->state->encoder_mask;
 142         }
 143
 144         drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
 145                 rockchip_drm_psr_inhibit_get(encoder);
 146 }
 147
 148 static void
 149 rockchip_drm_psr_inhibit_put_state(struct drm_atomic_state *state)
 150 {
 151         struct drm_crtc *crtc;
 152         struct drm_crtc_state *crtc_state;
 153         struct drm_encoder *encoder;
 154         u32 encoder_mask = 0;
 155         int i;
 156
 157         for_each_old_crtc_in_state(state, crtc, crtc_state, i) {
 158                 encoder_mask |= crtc_state->encoder_mask;
 159                 encoder_mask |= crtc->state->encoder_mask;
 160         }
 161
 162         drm_for_each_encoder_mask(encoder, state->dev, encoder_mask)
 163                 rockchip_drm_psr_inhibit_put(encoder);
 164 }
 165
 166 static void
 167 rockchip_atomic_helper_commit_tail_rpm(struct drm_atomic_state *old_state)
 168 {
 169         struct drm_device *dev = old_state->dev;
 170
 171         rockchip_drm_psr_inhibit_get_state(old_state);
 172
 173         drm_atomic_helper_commit_modeset_disables(dev, old_state);
 174
 175         drm_atomic_helper_commit_modeset_enables(dev, old_state);
 176
 177         drm_atomic_helper_commit_planes(dev, old_state,
 178                                         DRM_PLANE_COMMIT_ACTIVE_ONLY);
 179
 180         rockchip_drm_psr_inhibit_put_state(old_state);
 181
 182         drm_atomic_helper_commit_hw_done(old_state);
 183
 184         drm_atomic_helper_wait_for_vblanks(dev, old_state);
 185
 186         drm_atomic_helper_cleanup_planes(dev, old_state);
 187 }
 188
 189 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 190         .atomic_commit_tail = rockchip_atomic_helper_commit_tail_rpm,
 191 };
 192
 193 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 194         .fb_create = rockchip_user_fb_create,
 195         .output_poll_changed = drm_fb_helper_output_poll_changed,
 196         .atomic_check = drm_atomic_helper_check,
 197         .atomic_commit = drm_atomic_helper_commit,
 198 };
 199
 200 struct drm_framebuffer *
 201 rockchip_drm_framebuffer_init(struct drm_device *dev,
 202                               const struct drm_mode_fb_cmd2 *mode_cmd,
 203                               struct drm_gem_object *obj)
 204 {
 205         struct drm_framebuffer *fb;
 206
 207         fb = rockchip_fb_alloc(dev, mode_cmd, &obj, 1);
 208         if (IS_ERR(fb))
 209                 return ERR_CAST(fb);
 210
 211         return fb;
 212 }
 213
 214 void rockchip_drm_mode_config_init(struct drm_device *dev)
 215 {
 216         dev->mode_config.min_width = 0;
 217         dev->mode_config.min_height = 0;
 218
 219         /*
 220          * set max width and height as default value(4096x4096).
 221          * this value would be used to check framebuffer size limitation
 222          * at drm_mode_addfb().
 223          */
 224         dev->mode_config.max_width = 4096;
 225         dev->mode_config.max_height = 4096;
 226
 227         dev->mode_config.funcs = &rockchip_drm_mode_config_funcs;
 228         dev->mode_config.helper_private = &rockchip_mode_config_helpers;
 229 }