xref: /linux/drivers/gpu/drm/armada/armada_fb.c (revision f6e8dc9edf963dbc99085e54f6ced6da9daa6100)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2012 Russell King
4  */
5 
6 #include <drm/drm_modeset_helper.h>
7 #include <drm/drm_fourcc.h>
8 #include <drm/drm_gem_framebuffer_helper.h>
9 #include <drm/drm_print.h>
10 
11 #include "armada_drm.h"
12 #include "armada_fb.h"
13 #include "armada_gem.h"
14 #include "armada_hw.h"
15 
16 static const struct drm_framebuffer_funcs armada_fb_funcs = {
17 	.destroy	= drm_gem_fb_destroy,
18 	.create_handle	= drm_gem_fb_create_handle,
19 };
20 
21 struct armada_framebuffer *armada_framebuffer_create(struct drm_device *dev,
22 						     const struct drm_format_info *info,
23 						     const struct drm_mode_fb_cmd2 *mode,
24 						     struct armada_gem_object *obj)
25 {
26 	struct armada_framebuffer *dfb;
27 	uint8_t format, config;
28 	int ret;
29 
30 	switch (mode->pixel_format) {
31 #define FMT(drm, fmt, mod)		\
32 	case DRM_FORMAT_##drm:		\
33 		format = CFG_##fmt;	\
34 		config = mod;		\
35 		break
36 	FMT(RGB565,	565,		CFG_SWAPRB);
37 	FMT(BGR565,	565,		0);
38 	FMT(ARGB1555,	1555,		CFG_SWAPRB);
39 	FMT(ABGR1555,	1555,		0);
40 	FMT(RGB888,	888PACK,	CFG_SWAPRB);
41 	FMT(BGR888,	888PACK,	0);
42 	FMT(XRGB8888,	X888,		CFG_SWAPRB);
43 	FMT(XBGR8888,	X888,		0);
44 	FMT(ARGB8888,	8888,		CFG_SWAPRB);
45 	FMT(ABGR8888,	8888,		0);
46 	FMT(YUYV,	422PACK,	CFG_YUV2RGB | CFG_SWAPYU | CFG_SWAPUV);
47 	FMT(UYVY,	422PACK,	CFG_YUV2RGB);
48 	FMT(VYUY,	422PACK,	CFG_YUV2RGB | CFG_SWAPUV);
49 	FMT(YVYU,	422PACK,	CFG_YUV2RGB | CFG_SWAPYU);
50 	FMT(YUV422,	422,		CFG_YUV2RGB);
51 	FMT(YVU422,	422,		CFG_YUV2RGB | CFG_SWAPUV);
52 	FMT(YUV420,	420,		CFG_YUV2RGB);
53 	FMT(YVU420,	420,		CFG_YUV2RGB | CFG_SWAPUV);
54 	FMT(C8,		PSEUDO8,	0);
55 #undef FMT
56 	default:
57 		return ERR_PTR(-EINVAL);
58 	}
59 
60 	dfb = kzalloc(sizeof(*dfb), GFP_KERNEL);
61 	if (!dfb) {
62 		DRM_ERROR("failed to allocate Armada fb object\n");
63 		return ERR_PTR(-ENOMEM);
64 	}
65 
66 	dfb->fmt = format;
67 	dfb->mod = config;
68 	dfb->fb.obj[0] = &obj->obj;
69 
70 	drm_helper_mode_fill_fb_struct(dev, &dfb->fb, info, mode);
71 
72 	ret = drm_framebuffer_init(dev, &dfb->fb, &armada_fb_funcs);
73 	if (ret) {
74 		kfree(dfb);
75 		return ERR_PTR(ret);
76 	}
77 
78 	/*
79 	 * Take a reference on our object as we're successful - the
80 	 * caller already holds a reference, which keeps us safe for
81 	 * the above call, but the caller will drop their reference
82 	 * to it.  Hence we need to take our own reference.
83 	 */
84 	drm_gem_object_get(&obj->obj);
85 
86 	return dfb;
87 }
88 
89 struct drm_framebuffer *armada_fb_create(struct drm_device *dev,
90 	struct drm_file *dfile, const struct drm_format_info *info,
91 	const struct drm_mode_fb_cmd2 *mode)
92 {
93 	struct armada_gem_object *obj;
94 	struct armada_framebuffer *dfb;
95 	int ret;
96 
97 	DRM_DEBUG_DRIVER("w%u h%u pf%08x f%u p%u,%u,%u\n",
98 		mode->width, mode->height, mode->pixel_format,
99 		mode->flags, mode->pitches[0], mode->pitches[1],
100 		mode->pitches[2]);
101 
102 	/* We can only handle a single plane at the moment */
103 	if (info->num_planes > 1 &&
104 	    (mode->handles[0] != mode->handles[1] ||
105 	     mode->handles[0] != mode->handles[2])) {
106 		ret = -EINVAL;
107 		goto err;
108 	}
109 
110 	obj = armada_gem_object_lookup(dfile, mode->handles[0]);
111 	if (!obj) {
112 		ret = -ENOENT;
113 		goto err;
114 	}
115 
116 	if (obj->obj.import_attach && !obj->sgt) {
117 		ret = armada_gem_map_import(obj);
118 		if (ret)
119 			goto err_unref;
120 	}
121 
122 	/* Framebuffer objects must have a valid device address for scanout */
123 	if (!obj->mapped) {
124 		ret = -EINVAL;
125 		goto err_unref;
126 	}
127 
128 	dfb = armada_framebuffer_create(dev, info, mode, obj);
129 	if (IS_ERR(dfb)) {
130 		ret = PTR_ERR(dfb);
131 		goto err;
132 	}
133 
134 	drm_gem_object_put(&obj->obj);
135 
136 	return &dfb->fb;
137 
138  err_unref:
139 	drm_gem_object_put(&obj->obj);
140  err:
141 	DRM_ERROR("failed to initialize framebuffer: %d\n", ret);
142 	return ERR_PTR(ret);
143 }
144