drivers/gpu/drm/vkms/vkms_writeback.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/iosys-map.h>
   4
   5 #include <drm/drm_atomic.h>
   6 #include <drm/drm_edid.h>
   7 #include <drm/drm_fourcc.h>
   8 #include <drm/drm_writeback.h>
   9 #include <drm/drm_probe_helper.h>
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_gem_framebuffer_helper.h>
  12 #include <drm/drm_gem_shmem_helper.h>
  13
  14 #include "vkms_drv.h"
  15 #include "vkms_formats.h"
  16
  17 static const u32 vkms_wb_formats[] = {
  18         DRM_FORMAT_XRGB8888,
  19         DRM_FORMAT_XRGB16161616,
  20         DRM_FORMAT_ARGB16161616,
  21         DRM_FORMAT_RGB565
  22 };
  23
  24 static const struct drm_connector_funcs vkms_wb_connector_funcs = {
  25         .fill_modes = drm_helper_probe_single_connector_modes,
  26         .destroy = drm_connector_cleanup,
  27         .reset = drm_atomic_helper_connector_reset,
  28         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  29         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  30 };
  31
  32 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
  33                                         struct drm_crtc_state *crtc_state,
  34                                         struct drm_connector_state *conn_state)
  35 {
  36         struct drm_framebuffer *fb;
  37         const struct drm_display_mode *mode = &crtc_state->mode;
  38         int ret;
  39
  40         if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
  41                 return 0;
  42
  43         fb = conn_state->writeback_job->fb;
  44         if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
  45                 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
  46                               fb->width, fb->height);
  47                 return -EINVAL;
  48         }
  49
  50         ret = drm_atomic_helper_check_wb_encoder_state(encoder, conn_state);
  51         if (ret < 0)
  52                 return ret;
  53
  54         return 0;
  55 }
  56
  57 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
  58         .atomic_check = vkms_wb_encoder_atomic_check,
  59 };
  60
  61 static int vkms_wb_connector_get_modes(struct drm_connector *connector)
  62 {
  63         struct drm_device *dev = connector->dev;
  64
  65         return drm_add_modes_noedid(connector, dev->mode_config.max_width,
  66                                     dev->mode_config.max_height);
  67 }
  68
  69 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
  70                                struct drm_writeback_job *job)
  71 {
  72         struct vkms_writeback_job *vkmsjob;
  73         int ret;
  74
  75         if (!job->fb)
  76                 return 0;
  77
  78         vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
  79         if (!vkmsjob)
  80                 return -ENOMEM;
  81
  82         ret = drm_gem_fb_vmap(job->fb, vkmsjob->wb_frame_info.map, vkmsjob->data);
  83         if (ret) {
  84                 DRM_ERROR("vmap failed: %d\n", ret);
  85                 goto err_kfree;
  86         }
  87
  88         vkmsjob->wb_frame_info.fb = job->fb;
  89         drm_framebuffer_get(vkmsjob->wb_frame_info.fb);
  90
  91         job->priv = vkmsjob;
  92
  93         return 0;
  94
  95 err_kfree:
  96         kfree(vkmsjob);
  97         return ret;
  98 }
  99
 100 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
 101                                 struct drm_writeback_job *job)
 102 {
 103         struct vkms_writeback_job *vkmsjob = job->priv;
 104         struct vkms_device *vkmsdev;
 105
 106         if (!job->fb)
 107                 return;
 108
 109         drm_gem_fb_vunmap(job->fb, vkmsjob->wb_frame_info.map);
 110
 111         drm_framebuffer_put(vkmsjob->wb_frame_info.fb);
 112
 113         vkmsdev = drm_device_to_vkms_device(job->fb->dev);
 114         vkms_set_composer(&vkmsdev->output, false);
 115         kfree(vkmsjob);
 116 }
 117
 118 static void vkms_wb_atomic_commit(struct drm_connector *conn,
 119                                   struct drm_atomic_state *state)
 120 {
 121         struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
 122                                                                                          conn);
 123         struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
 124         struct vkms_output *output = &vkmsdev->output;
 125         struct drm_writeback_connector *wb_conn = &output->wb_connector;
 126         struct drm_connector_state *conn_state = wb_conn->base.state;
 127         struct vkms_crtc_state *crtc_state = output->composer_state;
 128         struct drm_framebuffer *fb = connector_state->writeback_job->fb;
 129         u16 crtc_height = crtc_state->base.crtc->mode.vdisplay;
 130         u16 crtc_width = crtc_state->base.crtc->mode.hdisplay;
 131         struct vkms_writeback_job *active_wb;
 132         struct vkms_frame_info *wb_frame_info;
 133         u32 wb_format = fb->format->format;
 134
 135         if (!conn_state)
 136                 return;
 137
 138         vkms_set_composer(&vkmsdev->output, true);
 139
 140         active_wb = conn_state->writeback_job->priv;
 141         wb_frame_info = &active_wb->wb_frame_info;
 142
 143         spin_lock_irq(&output->composer_lock);
 144         crtc_state->active_writeback = active_wb;
 145         wb_frame_info->offset = fb->offsets[0];
 146         wb_frame_info->pitch = fb->pitches[0];
 147         wb_frame_info->cpp = fb->format->cpp[0];
 148         crtc_state->wb_pending = true;
 149         spin_unlock_irq(&output->composer_lock);
 150         drm_writeback_queue_job(wb_conn, connector_state);
 151         active_wb->wb_write = get_line_to_frame_function(wb_format);
 152         drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
 153         drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height);
 154 }
 155
 156 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
 157         .get_modes = vkms_wb_connector_get_modes,
 158         .prepare_writeback_job = vkms_wb_prepare_job,
 159         .cleanup_writeback_job = vkms_wb_cleanup_job,
 160         .atomic_commit = vkms_wb_atomic_commit,
 161 };
 162
 163 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
 164 {
 165         struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
 166
 167         drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
 168
 169         return drm_writeback_connector_init(&vkmsdev->drm, wb,
 170                                             &vkms_wb_connector_funcs,
 171                                             &vkms_wb_encoder_helper_funcs,
 172                                             vkms_wb_formats,
 173                                             ARRAY_SIZE(vkms_wb_formats),
 174                                             1);
 175 }