From a5d98889bd5c3da0fec73dee0070338abf9b8dea Mon Sep 17 00:00:00 2001 From: Ravi Sarawadi Date: Tue, 11 Aug 2015 14:06:15 -0700 Subject: braswell: Tristate CFIO 139 and CFIO 140 CFIO 139 and CFIO 140 are consuming ~5 during stanndby. The reason for this leakage is internally it is configured to 1K PU. So there is leakage of ~2mW in standby. Total impact ~2.5 mw in Srandby. Configure these CFIOs as tristate for ~5mW power saving at platform level. BRANCH=none TEST=PnP Team to verify that the CFIO's are tri-stated. Change-Id: I6d78d2ccc08167b2cd6fc3405cfcb5c69a77d4b8 Signed-off-by: Patrick Georgi Original-Commit-Id: f11eb98cb36c504dfebe6f0fa53e9af120d21f24 Original-Change-Id: Ib309ad0c6abffa4515fdf2a2f2d9174fad7f8e8d Original-Signed-off-by: Hannah Williams Original-Signed-off-by: Ravishankar Sarawadi Original-Reviewed-on: https://chromium-review.googlesource.com/292863 Original-Commit-Ready: Rajmohan Mani Original-Reviewed-by: Duncan Laurie Reviewed-on: http://review.coreboot.org/11556 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc Reviewed-by: Aaron Durbin --- src/soc/intel/braswell/smihandler.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'src/soc/intel/braswell/smihandler.c') diff --git a/src/soc/intel/braswell/smihandler.c b/src/soc/intel/braswell/smihandler.c index eb8ee63ff1..576e1182c2 100644 --- a/src/soc/intel/braswell/smihandler.c +++ b/src/soc/intel/braswell/smihandler.c @@ -127,6 +127,12 @@ static void tristate_gpios(uint32_t val) HV_DDI2_DDC_SDA_MMIO_OFFSET, val); write32((void *)COMMUNITY_GPNORTH_BASE + HV_DDI2_DDC_SCL_MMIO_OFFSET, val); + + /* Tri-state CFIO 139 and 140 */ + write32((void *)COMMUNITY_GPSOUTHWEST_BASE + + CFIO_139_MMIO_OFFSET, val); + write32((void *)COMMUNITY_GPSOUTHWEST_BASE + + CFIO_140_MMIO_OFFSET, val); } -- cgit v1.2.3