From ff9104eae3512e554b4790b40b0bdd3fca2036b3 Mon Sep 17 00:00:00 2001 From: Subrata Banik Date: Mon, 29 Apr 2019 12:37:27 +0530 Subject: soc/intel/icelake: Clear PMCON status bits This patch ports CB:31902 changes from CNL to ICL. The prev_sleep_state value was showing 5 even after warm reboot, once the SUS_PWR_FLR bit is being set. This bit was not being cleared. Hence clearing the PMCON status bits. Change-Id: Ia07aa17b4491216a277c36edfe6ed2aa489287c6 Signed-off-by: Subrata Banik Reviewed-on: https://review.coreboot.org/c/coreboot/+/32503 Reviewed-by: Rizwan Qureshi Reviewed-by: Furquan Shaikh Tested-by: build bot (Jenkins) --- src/soc/intel/icelake/finalize.c | 2 ++ src/soc/intel/icelake/include/soc/pm.h | 3 +++ src/soc/intel/icelake/pmutil.c | 14 ++++++++++++++ 3 files changed, 19 insertions(+) (limited to 'src') diff --git a/src/soc/intel/icelake/finalize.c b/src/soc/intel/icelake/finalize.c index c1e6dd0d4a..e061cda2f0 100644 --- a/src/soc/intel/icelake/finalize.c +++ b/src/soc/intel/icelake/finalize.c @@ -87,6 +87,8 @@ static void pch_finalize(void) } pch_handle_sideband(config); + + pmc_clear_pmcon_sts(); } static void soc_finalize(void *unused) diff --git a/src/soc/intel/icelake/include/soc/pm.h b/src/soc/intel/icelake/include/soc/pm.h index 9caf49fa9a..44888ec747 100644 --- a/src/soc/intel/icelake/include/soc/pm.h +++ b/src/soc/intel/icelake/include/soc/pm.h @@ -168,5 +168,8 @@ uint16_t smbus_tco_regs(void); /* Set the DISB after DRAM init */ void pmc_set_disb(void); +/* Clear PMCON status bits */ +void pmc_clear_pmcon_sts(void); + #endif /* !defined(__ACPI__) */ #endif diff --git a/src/soc/intel/icelake/pmutil.c b/src/soc/intel/icelake/pmutil.c index 96ff52d122..e1b1665368 100644 --- a/src/soc/intel/icelake/pmutil.c +++ b/src/soc/intel/icelake/pmutil.c @@ -141,6 +141,20 @@ void pmc_set_disb(void) write8(addr, disb_val); } +void pmc_clear_pmcon_sts(void) +{ + uint32_t reg_val; + uint8_t *addr; + addr = pmc_mmio_regs(); + + reg_val = read32(addr + GEN_PMCON_A); + /* Clear SUS_PWR_FLR, GBL_RST_STS, HOST_RST_STS, PWR_FLR bits + * while retaining MS4V write-1-to-clear bit */ + reg_val &= ~(MS4V); + + write32((addr + GEN_PMCON_A), reg_val); +} + /* * PMC controller gets hidden from PCI bus * during FSP-Silicon init call. Hence PWRMBASE -- cgit v1.2.3