xref: /openbmc/linux/drivers/gpu/drm/vc4/vc4_kms.c (revision abfbd895)
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 }
68