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| author | Todd Broch <tbroch@chromium.org> | 2015-04-16 16:17:39 -0700 |
|---|---|---|
| committer | ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> | 2015-05-01 01:08:05 +0000 |
| commit | 56653dec06ede2c62ec35c74f0e133f18dd7ea50 (patch) | |
| tree | 9f08173d421c853341867a2a38621eeec5525de9 /include/flash.h | |
| parent | 8d62b79841f59f30da3a85aece4bbc88bcc9e7cd (diff) | |
| download | chrome-ec-56653dec06ede2c62ec35c74f0e133f18dd7ea50.tar.gz | |
plankton: Reset re-driver on boot and configure training more.
Commit, '0016de8 - plankton: Initialize re-driver', didn't account for
the state of the redriver at the time it was being initialized in
manual training mode. This led to inconsitencies of manual training
configuration.
This CL resets the SN75DP130 via software to guarantee configuration
regardless of cold versus warm boot.
Additionally I learned that manual training requires setting of both
the link_bw_set (5.4gbps) and lane_count_set (4) in order make the
back side of the redriver happy. This can ONLY be done however in the
presence of HPD high. Future CL will incorporate this DPCD init into
HDP interrupt handler as well.
Signed-off-by: Todd Broch <tbroch@chromium.org>
BRANCH=none
BUG=chrome-os-partner:35153
TEST=manual,
samus + plankton successfully drives Samsung U28D590 from cold or warm
boot of either plankton or samus in both polarities. Note DisplayPort
cable must be connected to external monitor prior to power on or reset.
macbook (2015 type-C) + plankton also works.
Change-Id: I8b34341d10f64abfa55c18f70c842a4446f36fa8
Reviewed-on: https://chromium-review.googlesource.com/266526
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Todd Broch <tbroch@chromium.org>
Tested-by: Todd Broch <tbroch@chromium.org>
Diffstat (limited to 'include/flash.h')
0 files changed, 0 insertions, 0 deletions