diff options
| author | Haim Dreyfuss <haim.dreyfuss@intel.com> | 2019-01-02 13:52:20 +0300 |
|---|---|---|
| committer | Luca Coelho <luciano.coelho@intel.com> | 2019-02-14 12:29:47 +0300 |
| commit | 48e775e66e2d77b1414cc065976c9ea8664ef19a (patch) | |
| tree | 1bb109b5ebcb981098bd5056901a4c36adc4c7cb /drivers/net/wireless/intel/iwlwifi/mvm/power.c | |
| parent | 2ae48edcf76721d6cfcec97e5ff18cd7983b7974 (diff) | |
| download | linux-48e775e66e2d77b1414cc065976c9ea8664ef19a.tar.xz | |
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/mvm/power.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/mvm/power.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/power.c b/drivers/net/wireless/intel/iwlwifi/mvm/power.c index df9f1d6cdf78..36f5fa1ee793 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/power.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/power.c @@ -8,7 +8,7 @@ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH * Copyright(c) 2015 - 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 @@ -31,7 +31,7 @@ * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH * Copyright(c) 2015 - 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 @@ -544,6 +544,9 @@ int iwl_mvm_power_update_device(struct iwl_mvm *mvm) cmd.flags &= cpu_to_le16(~DEVICE_POWER_FLAGS_POWER_SAVE_ENA_MSK); #endif + if (mvm->ext_clock_valid) + cmd.flags |= cpu_to_le16(DEVICE_POWER_FLAGS_32K_CLK_VALID_MSK); + IWL_DEBUG_POWER(mvm, "Sending device power command with flags = 0x%X\n", cmd.flags); |