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-rw-r--r--drivers/video/matrox/g450_pll.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/video/matrox/g450_pll.c b/drivers/video/matrox/g450_pll.c
index 440272ad10e7..7c76e079ca7d 100644
--- a/drivers/video/matrox/g450_pll.c
+++ b/drivers/video/matrox/g450_pll.c
@@ -331,7 +331,15 @@ static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
331 tmp |= M1064_XPIXCLKCTRL_PLL_UP; 331 tmp |= M1064_XPIXCLKCTRL_PLL_UP;
332 } 332 }
333 matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp); 333 matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
334#ifdef __powerpc__
335 /* This is necessary to avoid jitter on PowerPC
336 * (OpenFirmware) systems, but apparently
337 * introduces jitter, at least on a x86-64
338 * using DVI.
339 * A simple workaround is disable for non-PPC.
340 */
334 matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0); 341 matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0);
342#endif /* __powerpc__ */
335 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl); 343 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl);
336 344
337 matroxfb_DAC_unlock_irqrestore(flags); 345 matroxfb_DAC_unlock_irqrestore(flags);