wifi: iwlwifi: add support for external 32 KHz clock

In case the BIOS allows it, instruct the firmware to use the external 32
KHz clock.
The op mode specific implementation (i.e. reading the BIOS table) will
come in a later patch.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250212073923.9aae3f74fee0.I25ae45ef02b9ea387b512f974c1f3e5367a537e5@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-context-info-gen3.h b/drivers/net/wireless/intel/iwlwifi/iwl-context-info-gen3.h
index cd25a1b9f2ff424f4db0f8aad9a81d8c43566fa5..20563a32a21a840b37e4c8bc4fee2670e9097191 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/iwl-context-info-gen3.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-context-info-gen3.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2018, 2020-2024 Intel Corporation
+ * Copyright (C) 2018, 2020-2025 Intel Corporation
  */
 #ifndef __iwl_context_info_file_gen3_h__
 #define __iwl_context_info_file_gen3_h__
@@ -80,10 +80,12 @@ enum iwl_prph_scratch_flags {
  * enum iwl_prph_scratch_ext_flags - PRPH scratch control ext flags
  * @IWL_PRPH_SCRATCH_EXT_URM_FW: switch to URM mode based on fw setting
  * @IWL_PRPH_SCRATCH_EXT_URM_PERM: switch to permanent URM mode
+ * @IWL_PRPH_SCRATCH_EXT_32KHZ_CLK_VALID: use external 32 KHz clock
  */
 enum iwl_prph_scratch_ext_flags {
-       IWL_PRPH_SCRATCH_EXT_URM_FW     = BIT(4),
-       IWL_PRPH_SCRATCH_EXT_URM_PERM   = BIT(5),
+       IWL_PRPH_SCRATCH_EXT_URM_FW             = BIT(4),
+       IWL_PRPH_SCRATCH_EXT_URM_PERM           = BIT(5),
+       IWL_PRPH_SCRATCH_EXT_32KHZ_CLK_VALID    = BIT(8),
 };
 
 /**

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
index 021691513a576798e1c9fa3cbaeac9369f385df2..25fb4c50e38b1f8e1a2c773fa906a039f65f83d6 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h
@@ -888,6 +888,7 @@ struct iwl_txq {
  * @trans_specific: data for the specific transport this is allocated for/with
  * @dsbr_urm_fw_dependent: switch to URM based on fw settings
  * @dsbr_urm_permanent: switch to URM permanently
+ * @ext_32khz_clock_valid: if true, the external 32 KHz clock can be used
  */
 struct iwl_trans {
        bool csme_own;
@@ -916,6 +917,8 @@ struct iwl_trans {
        u8 dsbr_urm_fw_dependent:1,
           dsbr_urm_permanent:1;
 
+       bool ext_32khz_clock_valid;
+
        u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;
 
        bool pm_support;

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
index 838c426db7f05397f1dcc28a62c3b7be5f303fc5..8aa7c455bdee306c5f8347533720371d58ba3dce 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/ctxt-info-gen3.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2018-2024 Intel Corporation
+ * Copyright (C) 2018-2025 Intel Corporation
  */
 #include <linux/dmi.h>
 #include "iwl-trans.h"
@@ -137,6 +137,9 @@ int iwl_pcie_ctxt_info_gen3_init(struct iwl_trans *trans,
        if (trans->dsbr_urm_permanent)
                control_flags_ext |= IWL_PRPH_SCRATCH_EXT_URM_PERM;
 
+       if (trans->ext_32khz_clock_valid)
+               control_flags_ext |= IWL_PRPH_SCRATCH_EXT_32KHZ_CLK_VALID;
+
        /* Allocate prph scratch */
        prph_scratch = dma_alloc_coherent(trans->dev, sizeof(*prph_scratch),
                                          &trans_pcie->prph_scratch_dma_addr,