linux-kernel - Re: [PATCH ath-current 1/2] wifi: ath11k: add usecase firmware handling based on device compatible

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Message-ID: <af4e1f59-afa8-45ce-ba6f-5800dbfa9486@oss.qualcomm.com>
Date: Thu, 11 Dec 2025 09:38:39 +0800
From: Baochen Qiang <baochen.qiang@....qualcomm.com>
To: Miaoqing Pan <miaoqing.pan@....qualcomm.com>, jjohnson@...nel.org,
        johannes@...solutions.net, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org
Cc: ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH ath-current 1/2] wifi: ath11k: add usecase firmware
 handling based on device compatible



On 12/4/2025 3:10 PM, Miaoqing Pan wrote:
> For M.2 WLAN chips, there is no suitable DTS node to specify the
> firmware-name property. In addition, assigning firmware for the
> M.2 PCIe interface causes chips that do not use usecase specific
> firmware to fail. Therefore, abandoning the approach of specifying
> firmware in DTS. As an alternative, propose a static lookup table
> mapping device compatible to firmware names. Currently, only WCN6855
> HW2.1 requires this.
> 
> For details on usecase specific firmware, see:
> https://lore.kernel.org/all/20250522013444.1301330-3-miaoqing.pan@oss.qualcomm.com/.
> 
> Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04685-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1
> 
> Fixes: edbbc647c4f3 ("wifi: ath11k: support usercase-specific firmware overrides")
> Signed-off-by: Miaoqing Pan <miaoqing.pan@....qualcomm.com>
> ---
>  drivers/net/wireless/ath/ath11k/core.c | 37 +++++++++++++++++++++++++-
>  drivers/net/wireless/ath/ath11k/core.h |  7 +++--
>  2 files changed, 39 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
> index 812686173ac8..a4a3a65c7752 100644
> --- a/drivers/net/wireless/ath/ath11k/core.c
> +++ b/drivers/net/wireless/ath/ath11k/core.c
> @@ -1,7 +1,6 @@
>  // SPDX-License-Identifier: BSD-3-Clause-Clear
>  /*
>   * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
> - * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
>   * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
>   */
>  
> @@ -997,6 +996,42 @@ static const struct dmi_system_id ath11k_pm_quirk_table[] = {
>  	{}
>  };
>  
> +static const struct __ath11k_core_usecase_firmware_table {
> +	u32 hw_rev;
> +	const char *compatible;
> +	const char *firmware_name;
> +} ath11k_core_usecase_firmware_table[] = {
> +	{ ATH11K_HW_WCN6855_HW21, "qcom,lemans-evk", "nfa765"},
> +	{ ATH11K_HW_WCN6855_HW21, "qcom,monaco-evk", "nfa765"},
> +	{ ATH11K_HW_WCN6855_HW21, "qcom,hamoa-iot-evk", "nfa765"},
> +	{ /* Sentinel */ }
> +};
> +
> +const char *ath11k_core_get_usecase_firmware(struct ath11k_base *ab)
> +{
> +	struct device_node *root __free(device_node) = of_find_node_by_path("/");
> +	const struct __ath11k_core_usecase_firmware_table *entry = NULL;
> +	int i, count = of_property_count_strings(root, "compatible");
> +	const char *compatible = NULL;
> +
> +	for (i = 0; i < count; i++) {
> +		if (of_property_read_string_index(root, "compatible", i,
> +						  &compatible) < 0)
> +			continue;
> +
> +		entry = ath11k_core_usecase_firmware_table;
> +		while (entry->compatible) {
> +			if (ab->hw_rev == entry->hw_rev &&
> +			    !strcmp(entry->compatible, compatible))
> +				return entry->firmware_name;
> +			entry++;
> +		}
> +	}
> +
> +	return NULL;
> +}
> +EXPORT_SYMBOL(ath11k_core_get_usecase_firmware);
> +
>  void ath11k_fw_stats_pdevs_free(struct list_head *head)
>  {
>  	struct ath11k_fw_stats_pdev *i, *tmp;
> diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
> index e8780b05ce11..f8fcd897ebd2 100644
> --- a/drivers/net/wireless/ath/ath11k/core.h
> +++ b/drivers/net/wireless/ath/ath11k/core.h
> @@ -1,7 +1,7 @@
>  /* SPDX-License-Identifier: BSD-3-Clause-Clear */
>  /*
>   * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
> - * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved.
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
>   */
>  
>  #ifndef ATH11K_CORE_H
> @@ -1275,6 +1275,7 @@ bool ath11k_core_coldboot_cal_support(struct ath11k_base *ab);
>  
>  const struct firmware *ath11k_core_firmware_request(struct ath11k_base *ab,
>  						    const char *filename);
> +const char *ath11k_core_get_usecase_firmware(struct ath11k_base *ab);
>  
>  static inline const char *ath11k_scan_state_str(enum ath11k_scan_state state)
>  {
> @@ -1325,9 +1326,7 @@ static inline void ath11k_core_create_firmware_path(struct ath11k_base *ab,
>  						    const char *filename,
>  						    void *buf, size_t buf_len)
>  {
> -	const char *fw_name = NULL;
> -
> -	of_property_read_string(ab->dev->of_node, "firmware-name", &fw_name);
> +	const char *fw_name = ath11k_core_get_usecase_firmware(ab);
>  
>  	if (fw_name && strncmp(filename, "board", 5))
>  		snprintf(buf, buf_len, "%s/%s/%s/%s", ATH11K_FW_DIR,

Reviewed-by: Baochen Qiang <baochen.qiang@....qualcomm.com>