[PATCH] [RFC] cyber2000fb: avoid palette corruption at higher clocks

[Ondrej Zary]

When 1280x1024@75Hz mode is set, console palette is not set properly -
sometimes the background is white, sometimes yellow and text colors are also
messed up. This does not happen at 1280x1024@60Hz and below.

It seems that the HW needs some time before setting the palette - maybe the
PLL needs more time to lock at higher speeds. This patch fixes the problem but
without knowing what register to check for PLL lock(?), the delay might be
excessive.

Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>

--- linux-2.6.35-rc3-/drivers/video/cyber2000fb.c	2010-08-15 21:13:39.000000000 +0200
+++ linux-2.6.35-rc3/drivers/video/cyber2000fb.c	2010-08-15 21:25:20.000000000 +0200
@@ -506,6 +506,9 @@ static void cyber2000fb_set_timing(struc
 	cyber2000_grphw(0xb9, 0x80, cfb);
 	cyber2000_grphw(0xb9, 0x00, cfb);
 
+	/* wait (for the PLL?) to avoid palette corruption at higher clocks */
+	msleep(1000);
+
 	cfb->ramdac_ctrl = hw->ramdac;
 	cyber2000fb_write_ramdac_ctrl(cfb);
 



-- 
Ondrej Zary
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