diff options
| author | Haim Dreyfuss <haim.dreyfuss@intel.com> | 2019-01-02 12:52:20 +0200 |
|---|---|---|
| committer | Luca Coelho <luciano.coelho@intel.com> | 2019-02-14 11:29:47 +0200 |
| commit | 48e775e66e2d77b1414cc065976c9ea8664ef19a (patch) | |
| tree | 1bb109b5ebcb981098bd5056901a4c36adc4c7cb /drivers/net/wireless/intel/iwlwifi/fw/acpi.h | |
| parent | 2ae48edcf76721d6cfcec97e5ff18cd7983b7974 (diff) | |
iwlwifi: mvm: add support for 32kHz external clock indication
In low power modes, the chip clock source for platform integrated
devices is 32kHz. It is generated internally and supplied by a crystal
oscillator. However using a 32kHz sourced from crystal oscillator
has high power penalty.
There is an option to get an external 32kHz clock from the platform. Past
experience shows that the reliability is platform dependent,
i.e. on some platforms it works good and on other it doesn’t.
Working from external clock will save 0.5 mW in sleep state, from overall
1.8mW that we have today, i.e. almost 30%.
Each OEM can enable or disable the use of the external 32kHz clock by
setting a BIOS configuration. In case the OEM configured to use 32kHz
external clock the driver will pass this indication to the FW.
Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/fw/acpi.h')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/fw/acpi.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h index 7492dfb6729b..f5704e16643f 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h @@ -6,7 +6,7 @@ * GPL LICENSE SUMMARY * * Copyright(c) 2017 Intel Deutschland GmbH - * Copyright(c) 2018 Intel Corporation + * Copyright(c) 2018 - 2019 Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as @@ -27,7 +27,7 @@ * BSD LICENSE * * Copyright(c) 2017 Intel Deutschland GmbH - * Copyright(c) 2018 Intel Corporation + * Copyright(c) 2018 - 2019 Intel Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -67,6 +67,7 @@ #define ACPI_WGDS_METHOD "WGDS" #define ACPI_WRDD_METHOD "WRDD" #define ACPI_SPLC_METHOD "SPLC" +#define ACPI_ECKV_METHOD "ECKV" #define ACPI_WIFI_DOMAIN (0x07) @@ -86,6 +87,7 @@ #define ACPI_WGDS_WIFI_DATA_SIZE 19 #define ACPI_WRDD_WIFI_DATA_SIZE 2 #define ACPI_SPLC_WIFI_DATA_SIZE 2 +#define ACPI_ECKV_WIFI_DATA_SIZE 2 #define ACPI_WGDS_NUM_BANDS 2 #define ACPI_WGDS_TABLE_SIZE 3 @@ -109,6 +111,17 @@ int iwl_acpi_get_mcc(struct device *dev, char *mcc); u64 iwl_acpi_get_pwr_limit(struct device *dev); +/* + * iwl_acpi_get_eckv - read external clock validation from ACPI, if available + * + * @dev: the struct device + * @extl_clk: output var (2 bytes) that will get the clk indication. + * + * This function tries to read the external clock indication + * from ACPI if available. + */ +int iwl_acpi_get_eckv(struct device *dev, u32 *extl_clk); + #else /* CONFIG_ACPI */ static inline void *iwl_acpi_get_object(struct device *dev, acpi_string method) @@ -133,5 +146,10 @@ static inline u64 iwl_acpi_get_pwr_limit(struct device *dev) return 0; } +static inline int iwl_acpi_get_eckv(struct device *dev, u32 *extl_clk) +{ + return -ENOENT; +} + #endif /* CONFIG_ACPI */ #endif /* __iwl_fw_acpi__ */ |