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When shutting down the MAX77620 PMIC by asserting its SHDN pin, the EN_PP3300 output of the PMIC (GPIO3) is not driving low keeping the PP3300 rail up. Workaround that issue by removing the pull-up on EN_PP3300 when we assert SHDN. Revert the previous CL 263958 aka "ryu: workaround MAX77620 shutdown issue", in order to use a better workaround which ensures that the power rails sequencing at startup Detect the PP1800 rail going up and down by reading the HPD_IN gpio state (which has a pull-up tied to PP1800), then enable/disable EN_PP3300 in sequence. The code using an interrupt on HPD_IN is enabled only on P5, and as a downside, it is killing the base charging on those boards. Indeed HPD_IN(C1) is hijacking the EXTINT1 which used to be connected to the LID_OPEN (E1) GPIO used for the base detection. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chrome-os-partner:38689 TEST=on both P4 and P5 boards, do various power cycling sequences of the AP using the "apshutdown" and "powerbtn" commands. Change-Id: Icad6e9ae6a08d76cbfd19f97dd7c129bf43037d8 Reviewed-on: https://chromium-review.googlesource.com/265186 Trybot-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Gwendal Grignou <gwendal@chromium.org> Reviewed-by: Alec Berg <alecaberg@chromium.org>