From 86bd91a69a3fb285ce0ec2c3842d879035ee1269 Mon Sep 17 00:00:00 2001 From: Hung-Te Lin Date: Fri, 25 Apr 2014 08:21:24 +0800 Subject: nyan*: Clear VDDIO_SDMMC3 to reset SD card reader. When across warm reset, if VDD_3V3_SD_CARD gets power-cycled but VDDIO_SDMMC3 does not, we will get ~1.5V leakage on VDD. To fix that, we reset VDDIO_SDMMC3 to 0 along with VDD_3V3_SD_CARD in Coreboot. Payloads must turn on VDDIO_SDMMC3 explicitly before accessing SD card. Note the warnings of "VDD_SDMMC must set early" in comment seems only happens on U-Boot and can be removed. BUG=chrome-os-partner:27053 BRNACH=nyan TEST=Ctrl-U to boot from SD card, login and type "reboot", then Ctrl-U to boot again. Without this patch, system will fail in loading kernel. Original-Change-Id: I7f85995317d18587d514ea3afcff3bfea0a33e93 Original-Signed-off-by: Hung-Te Lin Original-Reviewed-on: https://chromium-review.googlesource.com/196961 Original-Reviewed-by: Gabe Black Original-Tested-by: Andrew Bresticker (cherry picked from commit 2cfdb78d9dc229a3c06f19bbe137d59d923908a4) Signed-off-by: Marc Jones Change-Id: Ie7d814e0424478c35a56fbc959437ee6a555684a Reviewed-on: http://review.coreboot.org/7866 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/mainboard/google/nyan/pmic.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) (limited to 'src/mainboard/google/nyan/pmic.c') diff --git a/src/mainboard/google/nyan/pmic.c b/src/mainboard/google/nyan/pmic.c index 7ec9290fd9..a6e881d10f 100644 --- a/src/mainboard/google/nyan/pmic.c +++ b/src/mainboard/google/nyan/pmic.c @@ -50,7 +50,7 @@ static struct as3722_init_reg init_list[] = { {AS3722_LDO2, 0x10, 0}, {AS3722_LDO4, 0x00, 0}, {AS3722_LDO5, 0x00, 0}, - {AS3722_LDO6, 0x3F, 0}, + {AS3722_LDO6, 0x00, 0}, {AS3722_LDO7, 0x00, 0}, {AS3722_LDO9, 0x00, 0}, {AS3722_LDO10, 0x00, 0}, @@ -99,15 +99,6 @@ void pmic_init(unsigned bus) */ pmic_write_reg(bus, 0x12, 0x10, 1); - /* - * Bring up VDD_SDMMC via the AS3722 PMIC on the PWR I2C bus. - * First set it to bypass 3.3V straight thru, then enable the regulator - * - * NOTE: We do this early because doing it later seems to hose the CPU - * power rail/partition startup. Need to debug. - */ - pmic_write_reg(bus, 0x16, 0x3f, 1); - /* * Panel power GPIO O4. Set mode for GPIO4 (0x0c to 7), then set * the value (register 0x20 bit 4) -- cgit v1.2.3