drivers/gpu/drm/rcar-du/rcar_du_writeback.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * rcar_du_writeback.c  --  R-Car Display Unit Writeback Support
   4  *
   5  * Copyright (C) 2019 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   6  */
   7
   8 #include <drm/drm_atomic_helper.h>
   9 #include <drm/drm_device.h>
  10 #include <drm/drm_fourcc.h>
  11 #include <drm/drm_probe_helper.h>
  12 #include <drm/drm_writeback.h>
  13
  14 #include "rcar_du_crtc.h"
  15 #include "rcar_du_drv.h"
  16 #include "rcar_du_kms.h"
  17 #include "rcar_du_writeback.h"
  18
  19 /**
  20  * struct rcar_du_wb_conn_state - Driver-specific writeback connector state
  21  * @state: base DRM connector state
  22  * @format: format of the writeback framebuffer
  23  */
  24 struct rcar_du_wb_conn_state {
  25         struct drm_connector_state state;
  26         const struct rcar_du_format_info *format;
  27 };
  28
  29 #define to_rcar_wb_conn_state(s) \
  30         container_of(s, struct rcar_du_wb_conn_state, state)
  31
  32 /**
  33  * struct rcar_du_wb_job - Driver-private data for writeback jobs
  34  * @sg_tables: scatter-gather tables for the framebuffer memory
  35  */
  36 struct rcar_du_wb_job {
  37         struct sg_table sg_tables[3];
  38 };
  39
  40 static int rcar_du_wb_conn_get_modes(struct drm_connector *connector)
  41 {
  42         struct drm_device *dev = connector->dev;
  43
  44         return drm_add_modes_noedid(connector, dev->mode_config.max_width,
  45                                     dev->mode_config.max_height);
  46 }
  47
  48 static int rcar_du_wb_prepare_job(struct drm_writeback_connector *connector,
  49                                   struct drm_writeback_job *job)
  50 {
  51         struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
  52         struct rcar_du_wb_job *rjob;
  53         int ret;
  54
  55         if (!job->fb)
  56                 return 0;
  57
  58         rjob = kzalloc(sizeof(*rjob), GFP_KERNEL);
  59         if (!rjob)
  60                 return -ENOMEM;
  61
  62         /* Map the framebuffer to the VSP. */
  63         ret = rcar_du_vsp_map_fb(rcrtc->vsp, job->fb, rjob->sg_tables);
  64         if (ret < 0) {
  65                 kfree(rjob);
  66                 return ret;
  67         }
  68
  69         job->priv = rjob;
  70         return 0;
  71 }
  72
  73 static void rcar_du_wb_cleanup_job(struct drm_writeback_connector *connector,
  74                                    struct drm_writeback_job *job)
  75 {
  76         struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
  77         struct rcar_du_wb_job *rjob = job->priv;
  78
  79         if (!job->fb)
  80                 return;
  81
  82         rcar_du_vsp_unmap_fb(rcrtc->vsp, job->fb, rjob->sg_tables);
  83         kfree(rjob);
  84 }
  85
  86 static const struct drm_connector_helper_funcs rcar_du_wb_conn_helper_funcs = {
  87         .get_modes = rcar_du_wb_conn_get_modes,
  88         .prepare_writeback_job = rcar_du_wb_prepare_job,
  89         .cleanup_writeback_job = rcar_du_wb_cleanup_job,
  90 };
  91
  92 static struct drm_connector_state *
  93 rcar_du_wb_conn_duplicate_state(struct drm_connector *connector)
  94 {
  95         struct rcar_du_wb_conn_state *copy;
  96
  97         if (WARN_ON(!connector->state))
  98                 return NULL;
  99
 100         copy = kzalloc(sizeof(*copy), GFP_KERNEL);
 101         if (!copy)
 102                 return NULL;
 103
 104         __drm_atomic_helper_connector_duplicate_state(connector, &copy->state);
 105
 106         return &copy->state;
 107 }
 108
 109 static void rcar_du_wb_conn_destroy_state(struct drm_connector *connector,
 110                                           struct drm_connector_state *state)
 111 {
 112         __drm_atomic_helper_connector_destroy_state(state);
 113         kfree(to_rcar_wb_conn_state(state));
 114 }
 115
 116 static void rcar_du_wb_conn_reset(struct drm_connector *connector)
 117 {
 118         struct rcar_du_wb_conn_state *state;
 119
 120         if (connector->state) {
 121                 rcar_du_wb_conn_destroy_state(connector, connector->state);
 122                 connector->state = NULL;
 123         }
 124
 125         state = kzalloc(sizeof(*state), GFP_KERNEL);
 126         if (state == NULL)
 127                 return;
 128
 129         __drm_atomic_helper_connector_reset(connector, &state->state);
 130 }
 131
 132 static const struct drm_connector_funcs rcar_du_wb_conn_funcs = {
 133         .reset = rcar_du_wb_conn_reset,
 134         .fill_modes = drm_helper_probe_single_connector_modes,
 135         .destroy = drm_connector_cleanup,
 136         .atomic_duplicate_state = rcar_du_wb_conn_duplicate_state,
 137         .atomic_destroy_state = rcar_du_wb_conn_destroy_state,
 138 };
 139
 140 static int rcar_du_wb_enc_atomic_check(struct drm_encoder *encoder,
 141                                        struct drm_crtc_state *crtc_state,
 142                                        struct drm_connector_state *conn_state)
 143 {
 144         struct rcar_du_wb_conn_state *wb_state =
 145                 to_rcar_wb_conn_state(conn_state);
 146         const struct drm_display_mode *mode = &crtc_state->mode;
 147         struct drm_device *dev = encoder->dev;
 148         struct drm_framebuffer *fb;
 149
 150         if (!conn_state->writeback_job)
 151                 return 0;
 152
 153         fb = conn_state->writeback_job->fb;
 154
 155         /*
 156          * Verify that the framebuffer format is supported and that its size
 157          * matches the current mode.
 158          */
 159         if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
 160                 dev_dbg(dev->dev, "%s: invalid framebuffer size %ux%u\n",
 161                         __func__, fb->width, fb->height);
 162                 return -EINVAL;
 163         }
 164
 165         wb_state->format = rcar_du_format_info(fb->format->format);
 166         if (wb_state->format == NULL) {
 167                 dev_dbg(dev->dev, "%s: unsupported format %08x\n", __func__,
 168                         fb->format->format);
 169                 return -EINVAL;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static const struct drm_encoder_helper_funcs rcar_du_wb_enc_helper_funcs = {
 176         .atomic_check = rcar_du_wb_enc_atomic_check,
 177 };
 178
 179 /*
 180  * Only RGB formats are currently supported as the VSP outputs RGB to the DU
 181  * and can't convert to YUV separately for writeback.
 182  */
 183 static const u32 writeback_formats[] = {
 184         DRM_FORMAT_RGB332,
 185         DRM_FORMAT_ARGB4444,
 186         DRM_FORMAT_XRGB4444,
 187         DRM_FORMAT_ARGB1555,
 188         DRM_FORMAT_XRGB1555,
 189         DRM_FORMAT_RGB565,
 190         DRM_FORMAT_BGR888,
 191         DRM_FORMAT_RGB888,
 192         DRM_FORMAT_BGRA8888,
 193         DRM_FORMAT_BGRX8888,
 194         DRM_FORMAT_ARGB8888,
 195         DRM_FORMAT_XRGB8888,
 196 };
 197
 198 int rcar_du_writeback_init(struct rcar_du_device *rcdu,
 199                            struct rcar_du_crtc *rcrtc)
 200 {
 201         struct drm_writeback_connector *wb_conn = &rcrtc->writeback;
 202
 203         wb_conn->encoder.possible_crtcs = 1 << drm_crtc_index(&rcrtc->crtc);
 204         drm_connector_helper_add(&wb_conn->base,
 205                                  &rcar_du_wb_conn_helper_funcs);
 206
 207         return drm_writeback_connector_init(rcdu->ddev, wb_conn,
 208                                             &rcar_du_wb_conn_funcs,
 209                                             &rcar_du_wb_enc_helper_funcs,
 210                                             writeback_formats,
 211                                             ARRAY_SIZE(writeback_formats));
 212 }
 213
 214 void rcar_du_writeback_setup(struct rcar_du_crtc *rcrtc,
 215                              struct vsp1_du_writeback_config *cfg)
 216 {
 217         struct rcar_du_wb_conn_state *wb_state;
 218         struct drm_connector_state *state;
 219         struct rcar_du_wb_job *rjob;
 220         struct drm_framebuffer *fb;
 221         unsigned int i;
 222
 223         state = rcrtc->writeback.base.state;
 224         if (!state || !state->writeback_job)
 225                 return;
 226
 227         fb = state->writeback_job->fb;
 228         rjob = state->writeback_job->priv;
 229         wb_state = to_rcar_wb_conn_state(state);
 230
 231         cfg->pixelformat = wb_state->format->v4l2;
 232         cfg->pitch = fb->pitches[0];
 233
 234         for (i = 0; i < wb_state->format->planes; ++i)
 235                 cfg->mem[i] = sg_dma_address(rjob->sg_tables[i].sgl)
 236                             + fb->offsets[i];
 237
 238         drm_writeback_queue_job(&rcrtc->writeback, state);
 239 }
 240
 241 void rcar_du_writeback_complete(struct rcar_du_crtc *rcrtc)
 242 {
 243         drm_writeback_signal_completion(&rcrtc->writeback, 0);
 244 }