CHROMIUM: drm: bridge/dw_hdmi: parse aspect ratio from drm display mode

When the aspect ratio in display mode is 19_6, then hdmi picture /
active aspect ratio values should set to 19_6. When HDMI output mode
keep same aspect value with the drm display mode, then we can express
rightly in the Source Video Format of HDMI CDF paper.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>

BUG=chrome-os-partner:38052
TEST=speedy board, cat HDMI avi_config register when
     machine connect with 1080p monitor.

Change-Id: I1b3c65dd051d90821d871665985f1b4806a81230
Reviewed-on: https://chromium-review.googlesource.com/260518
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Commit-Queue: Douglas Anderson <dianders@chromium.org>
Trybot-Ready: Douglas Anderson <dianders@chromium.org>
Commit-Queue: Eddie Cai <eddie.cai8848@gmail.com>
Tested-by: Eddie Cai <eddie.cai8848@gmail.com>
(cherry picked from commit 462ccb49768e2e9034d33afdbee8badd271b79b6)
Reviewed-on: https://chromium-review.googlesource.com/260813
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
1 file changed