xref: /linux/drivers/video/fbdev/core/Kconfig (revision db5d28c0bfe566908719bec8e25443aabecbb802)
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# fbdev core configuration
4#
5
6config FB_CORE
7	select VIDEO
8	tristate
9
10config FB_NOTIFY
11	bool
12
13config FIRMWARE_EDID
14	bool "Enable firmware EDID"
15	depends on FB
16	help
17	  This enables access to the EDID transferred from the firmware.
18	  On the i386, this is from the Video BIOS. Enable this if DDC/I2C
19	  transfers do not work for your driver and if you are using
20	  nvidiafb, i810fb or savagefb.
21
22	  In general, choosing Y for this option is safe.  If you
23	  experience extremely long delays while booting before you get
24	  something on your display, try setting this to N.  Matrox cards in
25	  combination with certain motherboards and monitors are known to
26	  suffer from this problem.
27
28config FB_DEVICE
29	bool "Provide legacy /dev/fb* device"
30	depends on FB_CORE
31	default FB
32	help
33	  Say Y here if you want the legacy /dev/fb* device file and
34	  interfaces within sysfs anc procfs. It is only required if you
35	  have userspace programs that depend on fbdev for graphics output.
36	  This does not affect the framebuffer console. If unsure, say N.
37
38config FB_DDC
39	tristate
40	depends on FB
41	select I2C_ALGOBIT
42	select I2C
43
44config FB_CFB_FILLRECT
45	tristate
46	depends on FB_CORE
47	help
48	  Include the cfb_fillrect function for generic software rectangle
49	  filling. This is used by drivers that don't provide their own
50	  (accelerated) version.
51
52config FB_CFB_COPYAREA
53	tristate
54	depends on FB_CORE
55	help
56	  Include the cfb_copyarea function for generic software area copying.
57	  This is used by drivers that don't provide their own (accelerated)
58	  version.
59
60config FB_CFB_IMAGEBLIT
61	tristate
62	depends on FB_CORE
63	help
64	  Include the cfb_imageblit function for generic software image
65	  blitting. This is used by drivers that don't provide their own
66	  (accelerated) version.
67
68config FB_CFB_REV_PIXELS_IN_BYTE
69	bool
70	depends on FB_CORE
71	help
72	  Allow generic frame-buffer functions to work on displays with 1, 2
73	  and 4 bits per pixel depths which has opposite order of pixels in
74	  byte order to bytes in long order.
75
76config FB_SYS_FILLRECT
77	tristate
78	depends on FB_CORE
79	help
80	  Include the sys_fillrect function for generic software rectangle
81	  filling. This is used by drivers that don't provide their own
82	  (accelerated) version and the framebuffer is in system RAM.
83
84config FB_SYS_COPYAREA
85	tristate
86	depends on FB_CORE
87	help
88	  Include the sys_copyarea function for generic software area copying.
89	  This is used by drivers that don't provide their own (accelerated)
90	  version and the framebuffer is in system RAM.
91
92config FB_SYS_IMAGEBLIT
93	tristate
94	depends on FB_CORE
95	help
96	  Include the sys_imageblit function for generic software image
97	  blitting. This is used by drivers that don't provide their own
98	  (accelerated) version and the framebuffer is in system RAM.
99
100config FB_PROVIDE_GET_FB_UNMAPPED_AREA
101	bool
102	depends on FB
103	help
104	  Allow generic frame-buffer to provide get_fb_unmapped_area
105	  function to provide shareable character device support on nommu.
106
107menuconfig FB_FOREIGN_ENDIAN
108	bool "Framebuffer foreign endianness support"
109	depends on FB
110	help
111	  This menu will let you enable support for the framebuffers with
112	  non-native endianness (e.g. Little-Endian framebuffer on a
113	  Big-Endian machine). Most probably you don't have such hardware,
114	  so it's safe to say "n" here.
115
116choice
117	prompt "Choice endianness support"
118	depends on FB_FOREIGN_ENDIAN
119
120config FB_BOTH_ENDIAN
121	bool "Support for Big- and Little-Endian framebuffers"
122
123config FB_BIG_ENDIAN
124	bool "Support for Big-Endian framebuffers only"
125
126config FB_LITTLE_ENDIAN
127	bool "Support for Little-Endian framebuffers only"
128
129endchoice
130
131config FB_SYSMEM_FOPS
132	tristate
133	depends on FB_CORE
134
135config FB_DEFERRED_IO
136	bool
137	depends on FB_CORE
138
139config FB_DMAMEM_HELPERS
140	bool
141	depends on FB_CORE
142	select FB_SYS_COPYAREA
143	select FB_SYS_FILLRECT
144	select FB_SYS_IMAGEBLIT
145	select FB_SYSMEM_FOPS
146
147config FB_DMAMEM_HELPERS_DEFERRED
148	bool
149	depends on FB_CORE
150	select FB_DEFERRED_IO
151	select FB_DMAMEM_HELPERS
152
153config FB_IOMEM_FOPS
154	tristate
155	depends on FB_CORE
156
157config FB_IOMEM_HELPERS
158	bool
159	depends on FB_CORE
160	select FB_CFB_COPYAREA
161	select FB_CFB_FILLRECT
162	select FB_CFB_IMAGEBLIT
163	select FB_IOMEM_FOPS
164
165config FB_IOMEM_HELPERS_DEFERRED
166	bool
167	depends on FB_CORE
168	select FB_DEFERRED_IO
169	select FB_IOMEM_HELPERS
170
171config FB_SYSMEM_HELPERS
172	bool
173	depends on FB_CORE
174	select FB_SYS_COPYAREA
175	select FB_SYS_FILLRECT
176	select FB_SYS_IMAGEBLIT
177	select FB_SYSMEM_FOPS
178
179config FB_SYSMEM_HELPERS_DEFERRED
180	bool
181	depends on FB_CORE
182	select FB_DEFERRED_IO
183	select FB_SYSMEM_HELPERS
184
185config FB_BACKLIGHT
186	tristate
187	depends on FB
188	select BACKLIGHT_CLASS_DEVICE
189
190config FB_MODE_HELPERS
191	bool "Enable Video Mode Handling Helpers"
192	depends on FB
193	help
194	  This enables functions for handling video modes using the
195	  Generalized Timing Formula and the EDID parser. A few drivers rely
196	  on this feature such as the radeonfb, rivafb, and the i810fb. If
197	  your driver does not take advantage of this feature, choosing Y will
198	  just increase the kernel size by about 5K.
199
200config FB_TILEBLITTING
201	bool "Enable Tile Blitting Support"
202	depends on FB
203	help
204	  This enables tile blitting.  Tile blitting is a drawing technique
205	  where the screen is divided into rectangular sections (tiles), whereas
206	  the standard blitting divides the screen into pixels. Because the
207	  default drawing element is a tile, drawing functions will be passed
208	  parameters in terms of number of tiles instead of number of pixels.
209	  For example, to draw a single character, instead of using bitmaps,
210	  an index to an array of bitmaps will be used.  To clear or move a
211	  rectangular section of a screen, the rectangle will be described in
212	  terms of number of tiles in the x- and y-axis.
213
214	  This is particularly important to one driver, matroxfb.  If
215	  unsure, say N.
216