radeonfb: fix setting of PPLL_REF_DIV for RV370 5B60.

As observed with various Radeon X300 cards console goes blank
without that fix.
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andreas Herrmann <aherrman@arcor.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/aty/radeon_base.c

@@ -1285,7 +1285,8 @@ static void radeon_write_pll_regs(struct radeonfb_info *rinfo, struct radeon_reg
 	if (rinfo->family == CHIP_FAMILY_R300 ||
 	    rinfo->family == CHIP_FAMILY_RS300 ||
 	    rinfo->family == CHIP_FAMILY_R350 ||
-	    rinfo->family == CHIP_FAMILY_RV350) {
+	    rinfo->family == CHIP_FAMILY_RV350 ||
+	    rinfo->family == CHIP_FAMILY_RV380 ) {
 		if (mode->ppll_ref_div & R300_PPLL_REF_DIV_ACC_MASK) {
 			/* When restoring console mode, use saved PPLL_REF_DIV
 			 * setting.