Commit 2946294f authored by Florian Tobias Schandinat's avatar Florian Tobias Schandinat
Browse files

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: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent 4d9fd0b7

drivers/video/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

drivers/video/via/hw.c

+7 −0
Original line number Diff line number Diff line
@@ -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();

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