kernel/drivers/gpu/drm/vc4/vc4_kms.c

   1 /*
   2  * Copyright (C) 2015 Broadcom
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /**
  10  * DOC: VC4 KMS
  11  *
  12  * This is the general code for implementing KMS mode setting that
  13  * doesn't clearly associate with any of the other objects (plane,
  14  * crtc, HDMI encoder).
  15  */
  16
  17 #include "drm_crtc.h"
  18 #include "drm_atomic_helper.h"
  19 #include "drm_crtc_helper.h"
  20 #include "drm_plane_helper.h"
  21 #include "drm_fb_cma_helper.h"
  22 #include "vc4_drv.h"
  23
  24 static void vc4_output_poll_changed(struct drm_device *dev)
  25 {
  26         struct vc4_dev *vc4 = to_vc4_dev(dev);
  27
  28         if (vc4->fbdev)
  29                 drm_fbdev_cma_hotplug_event(vc4->fbdev);
  30 }
  31
  32 static const struct drm_mode_config_funcs vc4_mode_funcs = {
  33         .output_poll_changed = vc4_output_poll_changed,
  34         .atomic_check = drm_atomic_helper_check,
  35         .atomic_commit = drm_atomic_helper_commit,
  36         .fb_create = drm_fb_cma_create,
  37 };
  38
  39 int vc4_kms_load(struct drm_device *dev)
  40 {
  41         struct vc4_dev *vc4 = to_vc4_dev(dev);
  42         int ret;
  43
  44         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  45         if (ret < 0) {
  46                 dev_err(dev->dev, "failed to initialize vblank\n");
  47                 return ret;
  48         }
  49
  50         dev->mode_config.max_width = 2048;
  51         dev->mode_config.max_height = 2048;
  52         dev->mode_config.funcs = &vc4_mode_funcs;
  53         dev->mode_config.preferred_depth = 24;
  54         dev->vblank_disable_allowed = true;
  55
  56         drm_mode_config_reset(dev);
  57
  58         vc4->fbdev = drm_fbdev_cma_init(dev, 32,
  59                                         dev->mode_config.num_crtc,
  60                                         dev->mode_config.num_connector);
  61         if (IS_ERR(vc4->fbdev))
  62                 vc4->fbdev = NULL;
  63
  64         drm_kms_helper_poll_init(dev);
  65
  66         return 0;
  67 }