From: Antonino A. Daplas Date: Mon, 1 Aug 2005 15:51:34 +0000 (+0800) Subject: [PATCH] tridentfb: Fix scrolling artifacts during disk IO X-Git-Tag: accepted/tizen/common/20141203.182822~44345 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8d894c47975f7222c5537e450e71310b395488c7;p=platform%2Fkernel%2Flinux-arm64.git [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 --- diff --git a/drivers/video/tridentfb.c b/drivers/video/tridentfb.c index 64aa78c..698ca92 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 */