rockchip: rk3288: multiple NPLL rate in pll_para_config

Due to HDMI need to set dclk_rate to 27Mhz, and we can't
caclu a suitable config paramters for this rate, so we
need to multiple rate unless the vco larger then VCO_MAX.

When NPLL rate multiple to 54MHz, pll_para_config could
caclu a right paramters, and I have verify the clock jitter
is okay to HDMI output.

Jitter Reports:
Dclk Rate      NPLL Rate      nr/no/nf      jitter      Margin
27MHz          54MHz          2/10/45       449.0ps     +51.0%

BRANCH=None
BUG=chrome-os-partner:42946
TEST=Mickey board, show right recovery picture on TV,
     and 480p clock jitter test passed

Change-Id: Iaa0a6622e63d88918ed465900e630bdf16fde706
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Original-Commit-Id: 59f1552026889f61167cfeaec3def668ba709c10
Original-Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Original-Change-Id: Iab274b41f163d2d61332df13e5091f0b605cb65c
Original-Reviewed-on: https://chromium-review.googlesource.com/288416
Original-Commit-Queue: David Hendricks <dhendrix@chromium.org>
Original-Tested-by: David Hendricks <dhendrix@chromium.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/290331
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/11393
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

0 files changed, 0 insertions, 0 deletions