intelfb: fix a bug when changing video timing

[sfrench/cifs-2.6.git] / drivers / video / intelfb / intelfbdrv.c

diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c
index ace14fe02fc4f49348024b1d1bc964cccffecbdc..0cafd642fbc0f57b5eaee3fe85a60895c30e1d8d 100644 (file)
--- a/drivers/video/intelfb/intelfbdrv.c
+++ b/drivers/video/intelfb/intelfbdrv.c
@@ -1365,6 +1365,11 @@ static int intelfb_set_par(struct fb_info *info)
        DBG_MSG("intelfb_set_par (%dx%d-%d)\n", info->var.xres,
                info->var.yres, info->var.bits_per_pixel);
 
+       /*
+        * Disable VCO prior to timing register change.
+        */
+       OUTREG(DPLL_A, INREG(DPLL_A) & ~DPLL_VCO_ENABLE);
+
        intelfb_blank(FB_BLANK_POWERDOWN, info);
 
        if (ACCEL(dinfo, info))