Zhuo-hao Lee (zhuo-hao.lee@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15910
-gerrit
commit d999712ad955e9f1a2af8d113b0cec3e7559b5f1 Author: Zhuo-hao.Lee zhuo-hao.lee@intel.com Date: Wed Jul 27 13:18:22 2016 +0800
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 --- src/soc/intel/skylake/acpi/scs.asl | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/src/soc/intel/skylake/acpi/scs.asl b/src/soc/intel/skylake/acpi/scs.asl index 56f27a9..69bc82a 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)