rockchip: rk3288: fix phsync & pvsync bug

Struct edid defien pvsync & phsync as an character,
like '+' or '-', so we need to check sync polarity
by comparing with characters '+' and '-' instead of
treating as boolean.

BRANCH=None
BUG=chrome-os-partner:42946
TEST=Mickey board, light monitor normally

Change-Id: I92d233e19b6df8917fb8ff9a327ccb842c152d65
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Original-Commit-Id: 2d22d4b6e7108474f67200e0fb1e4894cd88db85
Original-Change-Id: I14c72aa8994227092a1059d2b25c1dd2249b9db1
Original-Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/289963
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Commit-Queue: David Hendricks <dhendrix@chromium.org>
Original-Tested-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/11380
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed