From f36fcdf2ab6a9956ac60012404e0edf1d6653fac Mon Sep 17 00:00:00 2001 From: Lijian Zhao Date: Fri, 19 Apr 2019 17:36:46 -0700 Subject: mb/google/sarien: Fix s5 touchscreen power leakage Leakage power is observed from TOUCH_SCREEN_PD# (GPP_E7 which is connected to RESET pin of Wacom controller) during S5. To avoid leakage power, GPP_E7 needs to be turned off before S5 entry. BUG=b:129899315 TEST=Measure leakage power in S5 from both Arcada and Sarien Signed-off-by: Lijian Zhao Change-Id: Ie4229477b7149c0a75f4a8c6c7c453a37cc1c78c Reviewed-on: https://review.coreboot.org/c/coreboot/+/32367 Tested-by: build bot (Jenkins) Reviewed-by: Roy Mingi Park Reviewed-by: Duncan Laurie --- .../google/sarien/variants/arcada/include/variant/acpi/mainboard.asl | 4 ++++ .../google/sarien/variants/sarien/include/variant/acpi/mainboard.asl | 4 ++++ 2 files changed, 8 insertions(+) (limited to 'src/mainboard') diff --git a/src/mainboard/google/sarien/variants/arcada/include/variant/acpi/mainboard.asl b/src/mainboard/google/sarien/variants/arcada/include/variant/acpi/mainboard.asl index bc03696048..41121d28fe 100644 --- a/src/mainboard/google/sarien/variants/arcada/include/variant/acpi/mainboard.asl +++ b/src/mainboard/google/sarien/variants/arcada/include/variant/acpi/mainboard.asl @@ -14,6 +14,7 @@ */ #define CAM_EN GPP_B11 /* Active low */ +#define TS_PD GPP_E7 /* Method called from LPIT prior to enter s0ix state */ Method (MS0X, 1) @@ -31,6 +32,9 @@ Method (MS0X, 1) Method (MPTS, 1) { \_SB.PCI0.LPCB.EC0.PTS (Arg0) + + /* Clear touch screen pd pin to avoid leakage */ + \_SB.PCI0.CTXS (TS_PD) } /* Method called from _WAK prior to wakeup */ diff --git a/src/mainboard/google/sarien/variants/sarien/include/variant/acpi/mainboard.asl b/src/mainboard/google/sarien/variants/sarien/include/variant/acpi/mainboard.asl index bc03696048..41121d28fe 100644 --- a/src/mainboard/google/sarien/variants/sarien/include/variant/acpi/mainboard.asl +++ b/src/mainboard/google/sarien/variants/sarien/include/variant/acpi/mainboard.asl @@ -14,6 +14,7 @@ */ #define CAM_EN GPP_B11 /* Active low */ +#define TS_PD GPP_E7 /* Method called from LPIT prior to enter s0ix state */ Method (MS0X, 1) @@ -31,6 +32,9 @@ Method (MS0X, 1) Method (MPTS, 1) { \_SB.PCI0.LPCB.EC0.PTS (Arg0) + + /* Clear touch screen pd pin to avoid leakage */ + \_SB.PCI0.CTXS (TS_PD) } /* Method called from _WAK prior to wakeup */ -- cgit v1.2.3