drivers/gpu/drm/vkms/vkms_output.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include "vkms_drv.h"
   4 #include <drm/drm_atomic_helper.h>
   5 #include <drm/drm_edid.h>
   6 #include <drm/drm_probe_helper.h>
   7
   8 static const struct drm_connector_funcs vkms_connector_funcs = {
   9         .fill_modes = drm_helper_probe_single_connector_modes,
  10         .destroy = drm_connector_cleanup,
  11         .reset = drm_atomic_helper_connector_reset,
  12         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  13         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  14 };
  15
  16 static const struct drm_encoder_funcs vkms_encoder_funcs = {
  17         .destroy = drm_encoder_cleanup,
  18 };
  19
  20 static int vkms_conn_get_modes(struct drm_connector *connector)
  21 {
  22         int count;
  23
  24         /* Use the default modes list from DRM */
  25         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
  26         drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
  27
  28         return count;
  29 }
  30
  31 static const struct drm_connector_helper_funcs vkms_conn_helper_funcs = {
  32         .get_modes    = vkms_conn_get_modes,
  33 };
  34
  35 static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int index,
  36                                   struct drm_crtc *crtc)
  37 {
  38         struct vkms_plane *overlay;
  39
  40         overlay = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_OVERLAY, index);
  41         if (IS_ERR(overlay))
  42                 return PTR_ERR(overlay);
  43
  44         if (!overlay->base.possible_crtcs)
  45                 overlay->base.possible_crtcs = drm_crtc_mask(crtc);
  46
  47         return 0;
  48 }
  49
  50 int vkms_output_init(struct vkms_device *vkmsdev, int index)
  51 {
  52         struct vkms_output *output = &vkmsdev->output;
  53         struct drm_device *dev = &vkmsdev->drm;
  54         struct drm_connector *connector = &output->connector;
  55         struct drm_encoder *encoder = &output->encoder;
  56         struct drm_crtc *crtc = &output->crtc;
  57         struct vkms_plane *primary, *cursor = NULL;
  58         int ret;
  59         int writeback;
  60         unsigned int n;
  61
  62         /*
  63          * Initialize used plane. One primary plane is required to perform the composition.
  64          *
  65          * The overlay and cursor planes are not mandatory, but can be used to perform complex
  66          * composition.
  67          */
  68         primary = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_PRIMARY, index);
  69         if (IS_ERR(primary))
  70                 return PTR_ERR(primary);
  71
  72         if (vkmsdev->config->overlay) {
  73                 for (n = 0; n < NUM_OVERLAY_PLANES; n++) {
  74                         ret = vkms_add_overlay_plane(vkmsdev, index, crtc);
  75                         if (ret)
  76                                 return ret;
  77                 }
  78         }
  79
  80         if (vkmsdev->config->cursor) {
  81                 cursor = vkms_plane_init(vkmsdev, DRM_PLANE_TYPE_CURSOR, index);
  82                 if (IS_ERR(cursor))
  83                         return PTR_ERR(cursor);
  84         }
  85
  86         /* [1]: Allocation of a CRTC, its index will be BIT(0) = 1 */
  87         ret = vkms_crtc_init(dev, crtc, &primary->base, &cursor->base);
  88         if (ret)
  89                 return ret;
  90
  91         ret = drm_connector_init(dev, connector, &vkms_connector_funcs,
  92                                  DRM_MODE_CONNECTOR_VIRTUAL);
  93         if (ret) {
  94                 DRM_ERROR("Failed to init connector\n");
  95                 return ret;
  96         }
  97
  98         drm_connector_helper_add(connector, &vkms_conn_helper_funcs);
  99
 100         ret = drm_encoder_init(dev, encoder, &vkms_encoder_funcs,
 101                                DRM_MODE_ENCODER_VIRTUAL, NULL);
 102         if (ret) {
 103                 DRM_ERROR("Failed to init encoder\n");
 104                 goto err_encoder;
 105         }
 106         /*
 107          * This is a hardcoded value to select crtc for the encoder.
 108          * BIT(0) here designate the first registered CRTC, the one allocated in [1]
 109          */
 110         encoder->possible_crtcs = BIT(0);
 111
 112         ret = drm_connector_attach_encoder(connector, encoder);
 113         if (ret) {
 114                 DRM_ERROR("Failed to attach connector to encoder\n");
 115                 goto err_attach;
 116         }
 117
 118         if (vkmsdev->config->writeback) {
 119                 writeback = vkms_enable_writeback_connector(vkmsdev);
 120                 if (writeback)
 121                         DRM_ERROR("Failed to init writeback connector\n");
 122         }
 123
 124         drm_mode_config_reset(dev);
 125
 126         return 0;
 127
 128 err_attach:
 129         drm_encoder_cleanup(encoder);
 130
 131 err_encoder:
 132         drm_connector_cleanup(connector);
 133
 134         return ret;
 135 }