LXR linux/drivers/gpu/drm/rcar-du/rcar_du

   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 */
  24struct 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 */
  36struct rcar_du_wb_job {
  37        struct sg_table sg_tables[3];
  38};
  39
  40static 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
  48static 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
  73static 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
  86static 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
  92static struct drm_connector_state *
  93rcar_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
 109static 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
 116static 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
 132static 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
 140static 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
 175static 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 */
 183static 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
 198int 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
 214void 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
 241void rcar_du_writeback_complete(struct rcar_du_crtc *rcrtc)
 242{
 243        drm_writeback_signal_completion(&rcrtc->writeback, 0);
 244}
 245