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ppc: enter SNK mode before leaving dead battery mode

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If we don't enable the SNK mode before leaving dead battery mode
(which does keep the inflow path open), then we will brown out
our only source of power.

BRANCH=none
BUG=b:77561535
TEST=yorp can boot into ec without battery

Change-Id: I095e3cb1ed466fd6497bbc9e7b6851fc92005c75
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/999024
Reviewed-by: Scott Collyer <scollyer@chromium.org>
This commit is contained in:
Jett Rink
2018-04-05 15:07:05 -07:00
committed by chrome-bot
parent 8f27e60d82
commit 7e50bfd037
1 changed files with 14 additions and 5 deletions
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19
driver/ppc/nx20p3483.c
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@@ -202,14 +202,23 @@ static int nx20p3483_init(int port)
read_reg(port, NX20P3483_INTERRUPT1_REG, &reg);
read_reg(port, NX20P3483_INTERRUPT2_REG, &reg);
/* Make sure that dead battery mode is exited */
/* Check for dead battery mode */
rv = read_reg(port, NX20P3483_DEVICE_CONTROL_REG, &reg);
if (rv)
return rv;
reg |= NX20P3483_CTRL_DB_EXIT;
rv = write_reg(port, NX20P3483_DEVICE_CONTROL_REG, reg);
if (rv)
return rv;
/* If in dead battery mode switch to SNK mode before exiting */
if (!(reg & ~NX20P3483_CTRL_DB_EXIT)) {
rv = nx20p3483_vbus_sink_enable(port, 1);
if (rv)
return rv;
/* Exit dead battery mode. */
reg |= NX20P3483_CTRL_DB_EXIT;
rv = write_reg(port, NX20P3483_DEVICE_CONTROL_REG, reg);
if (rv)
return rv;
}
return EC_SUCCESS;
}