diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2021-05-05 13:41:24 -0600 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-05-06 23:32:12 +0000 |
| commit | f33f857fbe8e190c2972d4c466a3b7f96e03cd82 (patch) | |
| tree | 1eb35a49fcd7963d0eacc36294795b02d78e2061 /src/mainboard/google/guybrush/variants | |
| parent | 8317e727ce5d97626d7f59ac515d208502830ad1 (diff) | |
mb/google/guybrush: Switch eSPI ALERT# to in-band
Using the push-pull alert was causing leakages when in S0i3. This is
because the EC drives ALERT#, so when the AP enters S0i3, the extra
current leaks into the SoC and ends up turning on the power regulators.
By using in-band ALERT#, the EC no longer drives this pin high, thus
fixing the leak. We could also have used an open drain alert, but the
rise time is less than ideal.
BUG=b:187122344, b:186135022
TEST=Measure S0i3 power on guybrush and validate it's no longer high.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I6de771aeda8feca062652f0ea9eb57d31cb68562
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52955
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Rob Barnes <robbarnes@google.com>
Diffstat (limited to 'src/mainboard/google/guybrush/variants')
| -rw-r--r-- | src/mainboard/google/guybrush/variants/baseboard/devicetree.cb | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb index 061b27550e..88a0a1cae5 100644 --- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb +++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb @@ -35,7 +35,7 @@ chip soc/amd/cezanne .io_mode = ESPI_IO_MODE_QUAD, .op_freq_mhz = ESPI_OP_FREQ_33_MHZ, .crc_check_enable = 1, - .alert_pin = ESPI_ALERT_PIN_PUSH_PULL, + .alert_pin = ESPI_ALERT_PIN_IN_BAND, .periph_ch_en = 1, .vw_ch_en = 1, .oob_ch_en = 0, |