drivers/gpu/drm/bochs/bochs_kms.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/moduleparam.h>
   6
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_gem_framebuffer_helper.h>
   9 #include <drm/drm_probe_helper.h>
  10
  11 #include "bochs.h"
  12
  13 static int defx = 1024;
  14 static int defy = 768;
  15
  16 module_param(defx, int, 0444);
  17 module_param(defy, int, 0444);
  18 MODULE_PARM_DESC(defx, "default x resolution");
  19 MODULE_PARM_DESC(defy, "default y resolution");
  20
  21 /* ---------------------------------------------------------------------- */
  22
  23 static const uint32_t bochs_formats[] = {
  24         DRM_FORMAT_XRGB8888,
  25         DRM_FORMAT_BGRX8888,
  26 };
  27
  28 static void bochs_plane_update(struct bochs_device *bochs,
  29                                struct drm_plane_state *state)
  30 {
  31         struct drm_gem_vram_object *gbo;
  32         s64 gpu_addr;
  33
  34         if (!state->fb || !bochs->stride)
  35                 return;
  36
  37         gbo = drm_gem_vram_of_gem(state->fb->obj[0]);
  38         gpu_addr = drm_gem_vram_offset(gbo);
  39         if (WARN_ON_ONCE(gpu_addr < 0))
  40                 return; /* Bug: we didn't pin the BO to VRAM in prepare_fb. */
  41
  42         bochs_hw_setbase(bochs,
  43                          state->crtc_x,
  44                          state->crtc_y,
  45                          state->fb->pitches[0],
  46                          state->fb->offsets[0] + gpu_addr);
  47         bochs_hw_setformat(bochs, state->fb->format);
  48 }
  49
  50 static void bochs_pipe_enable(struct drm_simple_display_pipe *pipe,
  51                               struct drm_crtc_state *crtc_state,
  52                               struct drm_plane_state *plane_state)
  53 {
  54         struct bochs_device *bochs = pipe->crtc.dev->dev_private;
  55
  56         bochs_hw_setmode(bochs, &crtc_state->mode);
  57         bochs_plane_update(bochs, plane_state);
  58 }
  59
  60 static void bochs_pipe_update(struct drm_simple_display_pipe *pipe,
  61                               struct drm_plane_state *old_state)
  62 {
  63         struct bochs_device *bochs = pipe->crtc.dev->dev_private;
  64
  65         bochs_plane_update(bochs, pipe->plane.state);
  66 }
  67
  68 static const struct drm_simple_display_pipe_funcs bochs_pipe_funcs = {
  69         .enable     = bochs_pipe_enable,
  70         .update     = bochs_pipe_update,
  71         .prepare_fb = drm_gem_vram_simple_display_pipe_prepare_fb,
  72         .cleanup_fb = drm_gem_vram_simple_display_pipe_cleanup_fb,
  73 };
  74
  75 static int bochs_connector_get_modes(struct drm_connector *connector)
  76 {
  77         struct bochs_device *bochs =
  78                 container_of(connector, struct bochs_device, connector);
  79         int count = 0;
  80
  81         if (bochs->edid)
  82                 count = drm_add_edid_modes(connector, bochs->edid);
  83
  84         if (!count) {
  85                 count = drm_add_modes_noedid(connector, 8192, 8192);
  86                 drm_set_preferred_mode(connector, defx, defy);
  87         }
  88         return count;
  89 }
  90
  91 static const struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
  92         .get_modes = bochs_connector_get_modes,
  93 };
  94
  95 static const struct drm_connector_funcs bochs_connector_connector_funcs = {
  96         .fill_modes = drm_helper_probe_single_connector_modes,
  97         .destroy = drm_connector_cleanup,
  98         .reset = drm_atomic_helper_connector_reset,
  99         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 100         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 101 };
 102
 103 static void bochs_connector_init(struct drm_device *dev)
 104 {
 105         struct bochs_device *bochs = dev->dev_private;
 106         struct drm_connector *connector = &bochs->connector;
 107
 108         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 109                            DRM_MODE_CONNECTOR_VIRTUAL);
 110         drm_connector_helper_add(connector,
 111                                  &bochs_connector_connector_helper_funcs);
 112
 113         bochs_hw_load_edid(bochs);
 114         if (bochs->edid) {
 115                 DRM_INFO("Found EDID data blob.\n");
 116                 drm_connector_attach_edid_property(connector);
 117                 drm_connector_update_edid_property(connector, bochs->edid);
 118         }
 119 }
 120
 121 static struct drm_framebuffer *
 122 bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
 123                     const struct drm_mode_fb_cmd2 *mode_cmd)
 124 {
 125         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888 &&
 126             mode_cmd->pixel_format != DRM_FORMAT_BGRX8888)
 127                 return ERR_PTR(-EINVAL);
 128
 129         return drm_gem_fb_create(dev, file, mode_cmd);
 130 }
 131
 132 const struct drm_mode_config_funcs bochs_mode_funcs = {
 133         .fb_create = bochs_gem_fb_create,
 134         .mode_valid = drm_vram_helper_mode_valid,
 135         .atomic_check = drm_atomic_helper_check,
 136         .atomic_commit = drm_atomic_helper_commit,
 137 };
 138
 139 int bochs_kms_init(struct bochs_device *bochs)
 140 {
 141         int ret;
 142
 143         ret = drmm_mode_config_init(bochs->dev);
 144         if (ret)
 145                 return ret;
 146
 147         bochs->dev->mode_config.max_width = 8192;
 148         bochs->dev->mode_config.max_height = 8192;
 149
 150         bochs->dev->mode_config.fb_base = bochs->fb_base;
 151         bochs->dev->mode_config.preferred_depth = 24;
 152         bochs->dev->mode_config.prefer_shadow = 0;
 153         bochs->dev->mode_config.prefer_shadow_fbdev = 1;
 154         bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 155
 156         bochs->dev->mode_config.funcs = &bochs_mode_funcs;
 157
 158         bochs_connector_init(bochs->dev);
 159         drm_simple_display_pipe_init(bochs->dev,
 160                                      &bochs->pipe,
 161                                      &bochs_pipe_funcs,
 162                                      bochs_formats,
 163                                      ARRAY_SIZE(bochs_formats),
 164                                      NULL,
 165                                      &bochs->connector);
 166
 167         drm_mode_config_reset(bochs->dev);
 168
 169         return 0;
 170 }