1# SPDX-License-Identifier: GPL-2.0-only 2# 3# fbdev core configuration 4# 5 6config FB_CORE 7 select VIDEO_CMDLINE 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 y 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_SYS_FOPS 132 tristate 133 depends on FB_CORE 134 135config FB_DEFERRED_IO 136 bool 137 depends on FB_CORE 138 139config FB_DMA_HELPERS 140 bool 141 depends on FB_CORE 142 select FB_SYS_COPYAREA 143 select FB_SYS_FILLRECT 144 select FB_SYS_FOPS 145 select FB_SYS_IMAGEBLIT 146 147config FB_IOMEM_HELPERS 148 bool 149 depends on FB_CORE 150 select FB_CFB_COPYAREA 151 select FB_CFB_FILLRECT 152 select FB_CFB_IMAGEBLIT 153 154config FB_SYSMEM_HELPERS 155 bool 156 depends on FB_CORE 157 select FB_SYS_COPYAREA 158 select FB_SYS_FILLRECT 159 select FB_SYS_FOPS 160 select FB_SYS_IMAGEBLIT 161 162config FB_SYSMEM_HELPERS_DEFERRED 163 bool 164 depends on FB_CORE 165 select FB_DEFERRED_IO 166 select FB_SYSMEM_HELPERS 167 168config FB_BACKLIGHT 169 tristate 170 depends on FB 171 select BACKLIGHT_CLASS_DEVICE 172 173config FB_MODE_HELPERS 174 bool "Enable Video Mode Handling Helpers" 175 depends on FB 176 help 177 This enables functions for handling video modes using the 178 Generalized Timing Formula and the EDID parser. A few drivers rely 179 on this feature such as the radeonfb, rivafb, and the i810fb. If 180 your driver does not take advantage of this feature, choosing Y will 181 just increase the kernel size by about 5K. 182 183config FB_TILEBLITTING 184 bool "Enable Tile Blitting Support" 185 depends on FB 186 help 187 This enables tile blitting. Tile blitting is a drawing technique 188 where the screen is divided into rectangular sections (tiles), whereas 189 the standard blitting divides the screen into pixels. Because the 190 default drawing element is a tile, drawing functions will be passed 191 parameters in terms of number of tiles instead of number of pixels. 192 For example, to draw a single character, instead of using bitmaps, 193 an index to an array of bitmaps will be used. To clear or move a 194 rectangular section of a screen, the rectangle will be described in 195 terms of number of tiles in the x- and y-axis. 196 197 This is particularly important to one driver, matroxfb. If 198 unsure, say N. 199