From 60cc75df83f2da64132b6da6dd431417da6b2f4e Mon Sep 17 00:00:00 2001 From: Bora Guvendik Date: Mon, 25 Jul 2016 14:44:51 -0700 Subject: soc/intel/apollolake: Disable monitor mwait The monitor/mwait is broken on Apollolake. So use ACPI legacy mwait IO redirection as a work around BUG=chrome-os-partner:55110 Change-Id: I2e1834130d9586b4310466d3549d19bf427ffe24 Signed-off-by: Bora Guvendik Reviewed-on: https://review.coreboot.org/15890 Tested-by: build bot (Jenkins) Reviewed-by: Andrey Petrov Reviewed-by: Paul Menzel --- src/soc/intel/apollolake/chip.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/soc/intel/apollolake/chip.c b/src/soc/intel/apollolake/chip.c index c71e59a26c..544cd133c8 100644 --- a/src/soc/intel/apollolake/chip.c +++ b/src/soc/intel/apollolake/chip.c @@ -394,6 +394,9 @@ void platform_fsp_silicon_init_params_cb(struct FSPS_UPD *silupd) silconfig->LPSS_S0ixEnable = cfg->lpss_s0ix_enable; + /* Disable monitor mwait since it is broken due to a hardware bug without a fix */ + silconfig->MonitorMwaitEnable = 0; + /* Disable setting of EISS bit in FSP. */ silconfig->SpiEiss = 0; } -- cgit v1.2.3