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viafb: add X server compatibility mode 

This patch adds a config option to be compatible with X servers like
OpenChrome. This is required as for example the X server does not
handle things like disabled IGAs/PLLs resulting in a potential
freeze on X startup. With this option disabled we can provide some
nice features like power management and not reinitializing the
hardware on every mode switch (taking long time, causing flickering).

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Florian Tobias Schandinat 2011-04-23 23:52:45 +00:00
parent 4d9fd0b72c
commit 2946294f9a
2 changed files with 18 additions and 0 deletions
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11
drivers/video/Kconfig
View File

@ -1607,6 +1607,17 @@ config FB_VIA_DIRECT_PROCFS
correct output device configuration.
Its use is strongly discouraged.
config FB_VIA_X_COMPATIBILITY
bool "X server compatibility"
depends on FB_VIA
default n
help
This option reduces the functionality (power saving, ...) of the
framebuffer to avoid negative impact on the OpenChrome X server.
If you use any X server other than fbdev you should enable this
otherwise it should be safe to disable it and allow using all
features.
endif
config FB_NEOMAGIC

7
drivers/video/via/hw.c
View File

@ -2293,6 +2293,12 @@ int viafb_setmode(struct VideoModeTable *vmode_tbl, int video_bpp,
clock.set_primary_clock_source(VIA_CLKSRC_X1, true);
clock.set_secondary_clock_source(VIA_CLKSRC_X1, true);
#ifdef CONFIG_FB_VIA_X_COMPATIBILITY
clock.set_primary_pll_state(VIA_STATE_ON);
clock.set_primary_clock_state(VIA_STATE_ON);
clock.set_secondary_pll_state(VIA_STATE_ON);
clock.set_secondary_clock_state(VIA_STATE_ON);
#else
if (viaparinfo->shared->iga1_devices) {
clock.set_primary_pll_state(VIA_STATE_ON);
clock.set_primary_clock_state(VIA_STATE_ON);
@ -2308,6 +2314,7 @@ int viafb_setmode(struct VideoModeTable *vmode_tbl, int video_bpp,
clock.set_secondary_pll_state(VIA_STATE_OFF);
clock.set_secondary_clock_state(VIA_STATE_OFF);
}
#endif /*CONFIG_FB_VIA_X_COMPATIBILITY*/
via_set_state(devices, VIA_STATE_ON);
device_screen_on();