diff options
| author | Neil Chen <neilc@nvidia.com> | 2014-09-24 10:41:08 +0800 |
|---|---|---|
| committer | Aaron Durbin <adurbin@google.com> | 2015-04-04 04:04:01 +0200 |
| commit | ac4fef83454243d75571bac627a8ec15d3fcd405 (patch) | |
| tree | 8915fc1166eb29fdf6f7f210f5e8df96c106eab5 /src/soc/nvidia/tegra124/dp.c | |
| parent | 8c440a6befb735a4c1c553f5ff2e4539ec50e490 (diff) | |
| download | coreboot-ac4fef83454243d75571bac627a8ec15d3fcd405.tar.xz | |
tegra124: use known-good drive for fast-train only
A higher drive setting is used for fast link training, once the
link training succeeds, a known-good drive setting will be used
for the main stream transactions.
For full link training sequence, the sink devices may ask for a
preferred drive setting, thus this drive setting should be used
for the main stream transactions too.
BUG=chrome-os-partner:32129
TEST=all panels on blaze/big devices work fine.
Original-Change-Id: Icc540650dc1329af07fd9ee4661eb7fad435fde4
Original-Signed-off-by: Neil Chen <neilc@nvidia.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/219544
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
(cherry picked from commit 13d6accfdbe678e785851057f0800a3bbef11bea)
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Change-Id: If2fe7d5621f15aa3134d2a3920220e149bb64be6
Reviewed-on: http://review.coreboot.org/9248
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Diffstat (limited to 'src/soc/nvidia/tegra124/dp.c')
| -rw-r--r-- | src/soc/nvidia/tegra124/dp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra124/dp.c b/src/soc/nvidia/tegra124/dp.c index 9ff50ead8d..35a5c73036 100644 --- a/src/soc/nvidia/tegra124/dp.c +++ b/src/soc/nvidia/tegra124/dp.c @@ -1254,6 +1254,9 @@ static int tegra_dp_do_link_training(struct tegra_dc_dp_data *dp, printk(BIOS_ERR, "dp: full link training failed\n"); return ret; } + } else { + /* set to a known-good drive setting if fast link succeeded */ + tegra_dc_sor_set_voltage_swing(&dp->sor); } /* Everything goes well, double check the link config */ |