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authorHung-Te Lin <hungte@chromium.org>2014-04-25 08:21:24 +0800
committerMarc Jones <marc.jones@se-eng.com>2014-12-19 23:47:07 +0100
commit86bd91a69a3fb285ce0ec2c3842d879035ee1269 (patch)
treebfb347f0f75857eeb95b1207969c68fc6a5af08a /src/mainboard/google/nyan
parent6a16f697d8ab27eb9a19f9c0ec0ca82ca60adc47 (diff)
downloadcoreboot-86bd91a69a3fb285ce0ec2c3842d879035ee1269.tar.xz
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 <hungte@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/196961 Original-Reviewed-by: Gabe Black <gabeblack@chromium.org> Original-Tested-by: Andrew Bresticker <abrestic@chromium.org> (cherry picked from commit 2cfdb78d9dc229a3c06f19bbe137d59d923908a4) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: Ie7d814e0424478c35a56fbc959437ee6a555684a Reviewed-on: http://review.coreboot.org/7866 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/mainboard/google/nyan')
-rw-r--r--src/mainboard/google/nyan/pmic.c11
1 files changed, 1 insertions, 10 deletions
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},
@@ -100,15 +100,6 @@ 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)
*/