linux-kernel - [RESEND ath-next 2/2] wifi: ath12k: support usercase-specific firmware overrides

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Message-ID: <20250424005703.2479907-3-quic_miaoqing@quicinc.com>
Date: Thu, 24 Apr 2025 08:57:03 +0800
From: Miaoqing Pan <quic_miaoqing@...cinc.com>
To: <jjohnson@...nel.org>, <johannes@...solutions.net>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <ath12k@...ts.infradead.org>, <linux-wireless@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Miaoqing Pan
	<quic_miaoqing@...cinc.com>
Subject: [RESEND ath-next 2/2] wifi: ath12k: support usercase-specific firmware overrides

Introduce 'firmware-name' property to allow end-users and/or integrators to
decide which usecase-specific firmware to run on the WCN7850 platform. This
is necessary due to resource limitations such as memory capacity and CPU
capability, or performance and power optimization for different application
scenarios.

Currently, there are two firmwares, both files can be executed
interchangeably.
For example:

- ath12k/WCN7850/hw2.0/amss.bin,
  ath12k/WCN7850/hw2.0/m3.bin
  ath12k/WCN7850/hw2.0/board-2.bin

- ath12k/WCN7850/hw2.0/ncm825/amss.bin,
  ath12k/WCN7850/hw2.0/ncm825/m3.bin
  ath12k/WCN7850/hw2.0/board-2.bin

The former is the default firmware, suitable for most WiFi 7 STA functions.
The latter adds support for commercial-quality SAP and optimizes power
consumption for IoT applications. And both use the same BDF/regdb data
within the main board-2.bin.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

Signed-off-by: Miaoqing Pan <quic_miaoqing@...cinc.com>
---
 drivers/net/wireless/ath/ath12k/core.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 4b8f434e3e9a..cfe1ef156c34 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -17,6 +17,7 @@
 #include <linux/of_reserved_mem.h>
 #include <linux/panic_notifier.h>
 #include <linux/average.h>
+#include <linux/of.h>
 #include "qmi.h"
 #include "htc.h"
 #include "wmi.h"
@@ -1342,8 +1343,16 @@ static inline void ath12k_core_create_firmware_path(struct ath12k_base *ab,
 						    const char *filename,
 						    void *buf, size_t buf_len)
 {
-	snprintf(buf, buf_len, "%s/%s/%s", ATH12K_FW_DIR,
-		 ab->hw_params->fw.dir, filename);
+	const char *fw_name = NULL;
+
+	of_property_read_string(ab->dev->of_node, "firmware-name", &fw_name);
+
+	if (fw_name && strncmp(filename, "board", 5))
+		snprintf(buf, buf_len, "%s/%s/%s/%s", ATH12K_FW_DIR,
+			 ab->hw_params->fw.dir, fw_name, filename);
+	else
+		snprintf(buf, buf_len, "%s/%s/%s", ATH12K_FW_DIR,
+			 ab->hw_params->fw.dir, filename);
 }
 
 static inline const char *ath12k_bus_str(enum ath12k_bus bus)
-- 
2.25.1