drivers/gpu/drm/vkms/vkms_writeback.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include "vkms_drv.h"
   4 #include <drm/drm_fourcc.h>
   5 #include <drm/drm_writeback.h>
   6 #include <drm/drm_probe_helper.h>
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_gem_framebuffer_helper.h>
   9
  10 static const u32 vkms_wb_formats[] = {
  11         DRM_FORMAT_XRGB8888,
  12 };
  13
  14 static const struct drm_connector_funcs vkms_wb_connector_funcs = {
  15         .fill_modes = drm_helper_probe_single_connector_modes,
  16         .destroy = drm_connector_cleanup,
  17         .reset = drm_atomic_helper_connector_reset,
  18         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  19         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  20 };
  21
  22 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
  23                                         struct drm_crtc_state *crtc_state,
  24                                         struct drm_connector_state *conn_state)
  25 {
  26         struct drm_framebuffer *fb;
  27         const struct drm_display_mode *mode = &crtc_state->mode;
  28
  29         if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
  30                 return 0;
  31
  32         fb = conn_state->writeback_job->fb;
  33         if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
  34                 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
  35                               fb->width, fb->height);
  36                 return -EINVAL;
  37         }
  38
  39         if (fb->format->format != vkms_wb_formats[0]) {
  40                 struct drm_format_name_buf format_name;
  41
  42                 DRM_DEBUG_KMS("Invalid pixel format %s\n",
  43                               drm_get_format_name(fb->format->format,
  44                                                   &format_name));
  45                 return -EINVAL;
  46         }
  47
  48         return 0;
  49 }
  50
  51 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
  52         .atomic_check = vkms_wb_encoder_atomic_check,
  53 };
  54
  55 static int vkms_wb_connector_get_modes(struct drm_connector *connector)
  56 {
  57         struct drm_device *dev = connector->dev;
  58
  59         return drm_add_modes_noedid(connector, dev->mode_config.max_width,
  60                                     dev->mode_config.max_height);
  61 }
  62
  63 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
  64                                struct drm_writeback_job *job)
  65 {
  66         struct vkms_gem_object *vkms_obj;
  67         struct drm_gem_object *gem_obj;
  68         int ret;
  69
  70         if (!job->fb)
  71                 return 0;
  72
  73         gem_obj = drm_gem_fb_get_obj(job->fb, 0);
  74         ret = vkms_gem_vmap(gem_obj);
  75         if (ret) {
  76                 DRM_ERROR("vmap failed: %d\n", ret);
  77                 return ret;
  78         }
  79
  80         vkms_obj = drm_gem_to_vkms_gem(gem_obj);
  81         job->priv = vkms_obj->vaddr;
  82
  83         return 0;
  84 }
  85
  86 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
  87                                 struct drm_writeback_job *job)
  88 {
  89         struct drm_gem_object *gem_obj;
  90         struct vkms_device *vkmsdev;
  91
  92         if (!job->fb)
  93                 return;
  94
  95         gem_obj = drm_gem_fb_get_obj(job->fb, 0);
  96         vkms_gem_vunmap(gem_obj);
  97
  98         vkmsdev = drm_device_to_vkms_device(gem_obj->dev);
  99         vkms_set_composer(&vkmsdev->output, false);
 100 }
 101
 102 static void vkms_wb_atomic_commit(struct drm_connector *conn,
 103                                   struct drm_connector_state *state)
 104 {
 105         struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
 106         struct vkms_output *output = &vkmsdev->output;
 107         struct drm_writeback_connector *wb_conn = &output->wb_connector;
 108         struct drm_connector_state *conn_state = wb_conn->base.state;
 109         struct vkms_crtc_state *crtc_state = output->composer_state;
 110
 111         if (!conn_state)
 112                 return;
 113
 114         vkms_set_composer(&vkmsdev->output, true);
 115
 116         spin_lock_irq(&output->composer_lock);
 117         crtc_state->active_writeback = conn_state->writeback_job->priv;
 118         crtc_state->wb_pending = true;
 119         spin_unlock_irq(&output->composer_lock);
 120         drm_writeback_queue_job(wb_conn, state);
 121 }
 122
 123 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
 124         .get_modes = vkms_wb_connector_get_modes,
 125         .prepare_writeback_job = vkms_wb_prepare_job,
 126         .cleanup_writeback_job = vkms_wb_cleanup_job,
 127         .atomic_commit = vkms_wb_atomic_commit,
 128 };
 129
 130 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
 131 {
 132         struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
 133
 134         vkmsdev->output.wb_connector.encoder.possible_crtcs = 1;
 135         drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
 136
 137         return drm_writeback_connector_init(&vkmsdev->drm, wb,
 138                                             &vkms_wb_connector_funcs,
 139                                             &vkms_wb_encoder_helper_funcs,
 140                                             vkms_wb_formats,
 141                                             ARRAY_SIZE(vkms_wb_formats));
 142 }