diff options
| author | Zhuo-hao.Lee <zhuo-hao.lee@intel.com> | 2016-07-27 13:18:22 +0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-07-29 00:12:53 +0200 |
| commit | ce37e47f46e52090529a91a45d1c914d159643c8 (patch) | |
| tree | bb68692c1d15f692b315812f2931829943ec3762 | |
| parent | ec2947fb075838d1ea78754113aef6cf000cf522 (diff) | |
| download | coreboot-ce37e47f46e52090529a91a45d1c914d159643c8.tar.xz | |
skylake: fix VSDIO is at 0.8V when SDCard is not inserted
1. Enable SoC SD_CMD/D* signals pull-down of 20k when SD-card
is removed. When SD-card is disconnected, the pull-down is
disabled.
2. Provide path for weak leakage from buffers of SD_CMD/D* signal
to be grounded. Thus dropping voltage on the SD_CMD/D* signals to ~0V.
BUG=chrome-os-partner:54421
TEST=no power leakage when SDCard isn't inserted on skylake platform
Change-Id: I567199b172841125f8916a61a76005cfdaa62eb8
Signed-off-by: Zhuo-hao.Lee <zhuo-hao.lee@intel.com>
Reviewed-on: https://review.coreboot.org/15910
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
| -rw-r--r-- | src/soc/intel/skylake/acpi/scs.asl | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/acpi/scs.asl b/src/soc/intel/skylake/acpi/scs.asl index 56f27a97ea..69bc82a143 100644 --- a/src/soc/intel/skylake/acpi/scs.asl +++ b/src/soc/intel/skylake/acpi/scs.asl @@ -88,6 +88,14 @@ Device (SDXC) Method (_PS0, 0, Serialized) { + /* Disable 20K pull-down on CLK, CMD and DAT lines */ + ^^PCRA (PID_GPIOCOM3, 0x4c4, 0xFFFFEFFF) + ^^PCRA (PID_GPIOCOM3, 0x4cc, 0xFFFFEFFF) + ^^PCRA (PID_GPIOCOM3, 0x4d4, 0xFFFFEFFF) + ^^PCRA (PID_GPIOCOM3, 0x4dc, 0xFFFFEFFF) + ^^PCRA (PID_GPIOCOM3, 0x4e4, 0xFFFFEFFF) + ^^PCRA (PID_GPIOCOM3, 0x4f4, 0xFFFFEFFF) + /* Disable Power Gate */ Store (0, ^PGEN) @@ -113,6 +121,14 @@ Device (SDXC) Store (3, Local0) Store (Local0, ^D0D3) Store (^D0D3, Local0) + + /* Enable 20K pull-down on CLK, CMD and DAT lines */ + ^^PCRO (PID_GPIOCOM3, 0x4c4, 0x00001000) + ^^PCRO (PID_GPIOCOM3, 0x4cc, 0x00001000) + ^^PCRO (PID_GPIOCOM3, 0x4d4, 0x00001000) + ^^PCRO (PID_GPIOCOM3, 0x4dc, 0x00001000) + ^^PCRO (PID_GPIOCOM3, 0x4e4, 0x00001000) + ^^PCRO (PID_GPIOCOM3, 0x4f4, 0x00001000) } Device (CARD) |