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3c2c1398ec
When AP is off, turn off pullup on NSS, and set MISO to an input so the SPI module won't drive it high if the last sent bit was a 1. This reduces leakage when the AP is off. This patch also fixes a bug where gpio_set_alternate_function() set the wrong pins to normal-mode when func=-1; that didn't hit anything else because that functionality wasn't used on STM32 until now. BUG=chrome-os-partner:19304 BRANCH=none TEST=boot pit On EC console, with AP on, 'rw 0x40020000' returns read 0x40020000 = 0x6569aa20 <- must have 0x____aa__ Then 'apshutdown' and 'rw 0x40020000' returns read 0x40020000 = 0x65690020 <- must have 0x____00__ The 'power on' and AP turns back on. At u-boot prompt, 'sspi 2:0 256 9f00000000' returns FDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFDFEEC010001 (some number of 0xFD's followed by FEEC...) This shows SPI functionality is restored when AP is powered back on, and not just at init time. Change-Id: Ia3cd3e0bc222dc663d635509918fa3d383fd7971 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/51182 Reviewed-by: Simon Glass <sjg@chromium.org>