diff options
authorAntonino A. Daplas <>2005-08-01 23:51:34 +0800
committerLinus Torvalds <>2005-08-01 10:07:53 -0700
commit8d894c47975f7222c5537e450e71310b395488c7 (patch)
parent8dad46cf38c029248d1331b6a97b2999e0751cfa (diff)
[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: Antonino Daplas <> Signed-off-by: Linus Torvalds <>
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/video/tridentfb.c b/drivers/video/tridentfb.c
index 64aa78c5da79..698ca9232e73 100644
--- a/drivers/video/tridentfb.c
+++ b/drivers/video/tridentfb.c
@@ -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 */