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| author | Aseda Aboagye <aaboagye@google.com> | 2017-03-30 17:08:09 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2017-03-31 12:59:16 -0700 |
| commit | f7f3f249ee14785e0f5164c290521dd7f331859c (patch) | |
| tree | 4c0b6b23d534c9e7dd36d984708c20bfc5371527 | |
| parent | 38aabbbc6ca30e3d00e76778dc43807aadd788f3 (diff) | |
| download | chrome-ec-f7f3f249ee14785e0f5164c290521dd7f331859c.tar.gz | |
g: rbox: Let pins stabilize before releasing EC.
When releasing the PINMUX hold, some of the output levels may change.
Therefore, it's probably best to let those outputs stabilize before
letting the EC out of reset and sample them.
BUG=b:36659750
BRANCH=master,cr50
TEST=Flash Cr50. Verify that WP_L is stable before EC is released from
reset.
Change-Id: Ie2967c5e97f28240e1724b4531655c5dd08a3f29
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Reviewed-on: https://chromium-review.googlesource.com/464257
Commit-Ready: Aseda Aboagye <aaboagye@chromium.org>
Tested-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Mary Ruthven <mruthven@chromium.org>
| -rw-r--r-- | chip/g/rbox.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/chip/g/rbox.c b/chip/g/rbox.c index e7be79538c..2be1e19c11 100644 --- a/chip/g/rbox.c +++ b/chip/g/rbox.c @@ -42,11 +42,15 @@ void rbox_powerbtn_press(void) static void rbox_release_ec_reset(void) { + /* Unfreeze the PINMUX */ + GREG32(PINMUX, HOLD) = 0; + + /* Allow some time for outputs to stabilize. */ + usleep(500); + /* Let the EC go (the RO bootloader asserts it ASAP after POR) */ GREG32(RBOX, ASSERT_EC_RST) = 0; - /* And unfreeze the PINMUX */ - GREG32(PINMUX, HOLD) = 0; } DECLARE_HOOK(HOOK_INIT, rbox_release_ec_reset, HOOK_PRIO_LAST); |