Commit 8d894c47 authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
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[PATCH] tridentfb: Fix scrolling artifacts during disk IO



Reported by: Jochen Hein (Bugzilla Bug 4312)

When there is disk I/O happening, the framebuffer has a little snow on
the screen.  Once I/O has finished, no garbage remains on screen.

This bug was explained by: Knut Petersen

Most important is CRTC register 2f, signal quality is also improved for
higher vclk values by changing set_vclk() according to the X drivers and
cyblafb.c

The fix is to set the performance register (0x2f) with a more stable
value.
Signed-off-by: default avatarAntonino Daplas <adaplas@pol.net>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8dad46cf
......@@ -904,7 +904,7 @@ static int tridentfb_set_par(struct fb_info *info)
write3X4(DRAMControl, tmp); //both IO,linear enable
write3X4(InterfaceSel, read3X4(InterfaceSel) | 0x40);
write3X4(Performance,0x20);
write3X4(Performance,0x92);
write3X4(PCIReg,0x07); //MMIO & PCI read and write burst enable
/* convert from picoseconds to MHz */
......
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