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Joseph Chan09a525e2008-10-15 22:03:19 -07001
2 VIA Integration Graphic Chip Console Framebuffer Driver
3
4[Platform]
5-----------------------
6 The console framebuffer driver is for graphics chips of
7 VIA UniChrome Family(CLE266, PM800 / CN400 / CN300,
8 P4M800CE / P4M800Pro / CN700 / VN800,
9 CX700 / VX700, K8M890, P4M890,
Harald Welte4562aea2009-12-15 16:46:42 -080010 CN896 / P4M900, VX800, VX855)
Joseph Chan09a525e2008-10-15 22:03:19 -070011
12[Driver features]
13------------------------
14 Device: CRT, LCD, DVI
15
16 Support viafb_mode:
17 CRT:
18 640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
19 720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
20 848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
21 1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
22 1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
23 1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
24 1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)
25
26 color depth: 8 bpp, 16 bpp, 32 bpp supports.
27
28 Support 2D hardware accelerator.
29
30[Using the viafb module]
31-- -- --------------------
32 Start viafb with default settings:
33 #modprobe viafb
34
35 Start viafb with with user options:
36 #modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
37 viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
38 viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
39 viafb_SAMM_ON=1
40
41 viafb_mode:
42 640x480 (default)
43 720x480
44 800x600
45 1024x768
46 ......
47
48 viafb_bpp:
49 8, 16, 32 (default:32)
50
51 viafb_refresh:
52 60, 75, 85, 100, 120 (default:60)
53
54 viafb_lcd_dsp_method:
55 0 : expansion (default)
56 1 : centering
57
58 viafb_lcd_mode:
59 0 : LCD panel with LSB data format input (default)
60 1 : LCD panel with MSB data format input
61
62 viafb_lcd_panel_id:
63 0 : Resolution: 640x480, Channel: single, Dithering: Enable
64 1 : Resolution: 800x600, Channel: single, Dithering: Enable
65 2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)
66 3 : Resolution: 1280x768, Channel: single, Dithering: Enable
67 4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable
68 5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable
69 6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable
70
71 8 : Resolution: 800x480, Channel: single, Dithering: Enable
72 9 : Resolution: 1024x768, Channel: dual, Dithering: Enable
73 10: Resolution: 1024x768, Channel: single, Dithering: Disable
74 11: Resolution: 1024x768, Channel: dual, Dithering: Disable
75 12: Resolution: 1280x768, Channel: single, Dithering: Disable
76 13: Resolution: 1280x1024, Channel: dual, Dithering: Disable
77 14: Resolution: 1400x1050, Channel: dual, Dithering: Disable
78 15: Resolution: 1600x1200, Channel: dual, Dithering: Disable
79 16: Resolution: 1366x768, Channel: single, Dithering: Disable
80 17: Resolution: 1024x600, Channel: single, Dithering: Enable
81 18: Resolution: 1280x768, Channel: dual, Dithering: Enable
82 19: Resolution: 1280x800, Channel: single, Dithering: Enable
83
84 viafb_accel:
85 0 : No 2D Hardware Acceleration
86 1 : 2D Hardware Acceleration (default)
87
88 viafb_SAMM_ON:
89 0 : viafb_SAMM_ON disable (default)
90 1 : viafb_SAMM_ON enable
91
92 viafb_mode1: (secondary display device)
93 640x480 (default)
94 720x480
95 800x600
96 1024x768
97 ... ...
98
99 viafb_bpp1: (secondary display device)
100 8, 16, 32 (default:32)
101
102 viafb_refresh1: (secondary display device)
103 60, 75, 85, 100, 120 (default:60)
104
105 viafb_active_dev:
106 This option is used to specify active devices.(CRT, DVI, CRT+LCD...)
107 DVI stands for DVI or HDMI, E.g., If you want to enable HDMI,
108 set viafb_active_dev=DVI. In SAMM case, the previous of
109 viafb_active_dev is primary device, and the following is
110 secondary device.
111
112 For example:
113 To enable one device, such as DVI only, we can use:
114 modprobe viafb viafb_active_dev=DVI
115 To enable two devices, such as CRT+DVI:
116 modprobe viafb viafb_active_dev=CRT+DVI;
117
118 For DuoView case, we can use:
119 modprobe viafb viafb_active_dev=CRT+DVI
120 OR
121 modprobe viafb viafb_active_dev=DVI+CRT...
122
123 For SAMM case:
124 If CRT is primary and DVI is secondary, we should use:
125 modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
126 If DVI is primary and CRT is secondary, we should use:
127 modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
128
129 viafb_display_hardware_layout:
130 This option is used to specify display hardware layout for CX700 chip.
131 1 : LCD only
132 2 : DVI only
133 3 : LCD+DVI (default)
134 4 : LCD1+LCD2 (internal + internal)
135 16: LCD1+ExternalLCD2 (internal + external)
136
137 viafb_second_size:
138 This option is used to set second device memory size(MB) in SAMM case.
139 The minimal size is 16.
140
141 viafb_platform_epia_dvi:
142 This option is used to enable DVI on EPIA - M
143 0 : No DVI on EPIA - M (default)
144 1 : DVI on EPIA - M
145
146 viafb_bus_width:
147 When using 24 - Bit Bus Width Digital Interface,
148 this option should be set.
149 12: 12-Bit LVDS or 12-Bit TMDS (default)
150 24: 24-Bit LVDS or 24-Bit TMDS
151
152 viafb_device_lcd_dualedge:
153 When using Dual Edge Panel, this option should be set.
154 0 : No Dual Edge Panel (default)
155 1 : Dual Edge Panel
156
Joseph Chan09a525e2008-10-15 22:03:19 -0700157 viafb_lcd_port:
158 This option is used to specify LCD output port,
159 available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".
160 for external LCD + external DVI on CX700(External LCD is on DVP0),
161 we should use:
162 modprobe viafb viafb_lcd_port=DVP0...
163
164Notes:
165 1. CRT may not display properly for DuoView CRT & DVI display at
166 the "640x480" PAL mode with DVI overscan enabled.
167 2. SAMM stands for single adapter multi monitors. It is different from
168 multi-head since SAMM support multi monitor at driver layers, thus fbcon
169 layer doesn't even know about it; SAMM's second screen doesn't have a
170 device node file, thus a user mode application can't access it directly.
171 When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and
172 viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
173 3. When console is depending on viafbinfo1, dynamically change resolution
174 and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE
175 instead of calling common ioctl function FBIOPUT_VSCREENINFO since
176 viafb doesn't support multi-head well, or it will cause screen crush.
Joseph Chan09a525e2008-10-15 22:03:19 -0700177
178
179[Configure viafb with "fbset" tool]
180-----------------------------------
181 "fbset" is an inbox utility of Linux.
182 1. Inquire current viafb information, type,
183 # fbset -i
184
185 2. Set various resolutions and viafb_refresh rates,
186 # fbset <resolution-vertical_sync>
187
188 example,
189 # fbset "1024x768-75"
190 or
191 # fbset -g 1024 768 1024 768 32
192 Check the file "/etc/fb.modes" to find display modes available.
193
194 3. Set the color depth,
195 # fbset -depth <value>
196
197 example,
198 # fbset -depth 16
199
Florian Tobias Schandinat47eb1d82010-09-19 05:35:44 +0000200
201[Configure viafb via /proc]
202---------------------------
203 The following files exist in /proc/viafb
204
205 supported_output_devices
206
207 This read-only file contains a full ',' seperated list containing all
208 output devices that could be available on your platform. It is likely
209 that not all of those have a connector on your hardware but it should
210 provide a good starting point to figure out which of those names match
211 a real connector.
212 Example:
213 # cat /proc/viafb/supported_output_devices
214
215 iga1/output_devices
216 iga2/output_devices
217
218 These two files are readable and writable. iga1 and iga2 are the two
219 independent units that produce the screen image. Those images can be
220 forwarded to one or more output devices. Reading those files is a way
221 to query which output devices are currently used by an iga.
222 Example:
223 # cat /proc/viafb/iga1/output_devices
224 If there are no output devices printed the output of this iga is lost.
225 This can happen for example if only one (the other) iga is used.
226 Writing to these files allows adjusting the output devices during
227 runtime. One can add new devices, remove existing ones or switch
228 between igas. Essentially you can write a ',' seperated list of device
229 names (or a single one) in the same format as the output to those
230 files. You can add a '+' or '-' as a prefix allowing simple addition
231 and removal of devices. So a prefix '+' adds the devices from your list
232 to the already existing ones, '-' removes the listed devices from the
233 existing ones and if no prefix is given it replaces all existing ones
234 with the listed ones. If you remove devices they are expected to turn
235 off. If you add devices that are already part of the other iga they are
236 removed there and added to the new one.
237 Examples:
238 Add CRT as output device to iga1
239 # echo +CRT > /proc/viafb/iga1/output_devices
240
241 Remove (turn off) DVP1 and LVDS1 as output devices of iga2
242 # echo -DVP1,LVDS1 > /proc/viafb/iga2/output_devices
243
244 Replace all iga1 output devices by CRT
245 # echo CRT > /proc/viafb/iga1/output_devices
246
247
Joseph Chan09a525e2008-10-15 22:03:19 -0700248[Bootup with viafb]:
249--------------------
250 Add the following line to your grub.conf:
251 append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"
252