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Subject[PATCH 2/2] ath10k: Try to download pre-cal using nvmem api
Date
Most of routers that have the ath10k wifi chip integrated in the Soc
have the pre-cal data stored in a dedicated nvmem partition.
Introduce a new function to directly extract and use it if a nvmem with
the name 'pre-cal' is defined and available.
Pre-cal file have still priority to everything else.

Tested-on: QCA9984 hw1.0 PCI 10.4

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
---
drivers/net/wireless/ath/ath10k/core.c | 52 +++++++++++++++++++++++++-
drivers/net/wireless/ath/ath10k/core.h | 3 ++
2 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index 9ed7b9883..dd509a4a8 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -15,6 +15,7 @@
#include <linux/ctype.h>
#include <linux/pm_qos.h>
#include <asm/byteorder.h>
+#include <linux/nvmem-consumer.h>

#include "core.h"
#include "mac.h"
@@ -920,7 +921,8 @@ static int ath10k_core_get_board_id_from_otp(struct ath10k *ar)
}

if (ar->cal_mode == ATH10K_PRE_CAL_MODE_DT ||
- ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE)
+ ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE ||
+ ar->cal_mode == ATH10K_PRE_CAL_MODE_NVMEM)
bmi_board_id_param = BMI_PARAM_GET_FLASH_BOARD_ID;
else
bmi_board_id_param = BMI_PARAM_GET_EEPROM_BOARD_ID;
@@ -1682,7 +1684,8 @@ static int ath10k_download_and_run_otp(struct ath10k *ar)

/* As of now pre-cal is valid for 10_4 variants */
if (ar->cal_mode == ATH10K_PRE_CAL_MODE_DT ||
- ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE)
+ ar->cal_mode == ATH10K_PRE_CAL_MODE_FILE ||
+ ar->cal_mode == ATH10K_PRE_CAL_MODE_NVMEM)
bmi_otp_exe_param = BMI_PARAM_FLASH_SECTION_ALL;

ret = ath10k_bmi_execute(ar, address, bmi_otp_exe_param, &result);
@@ -1703,6 +1706,41 @@ static int ath10k_download_and_run_otp(struct ath10k *ar)
return 0;
}

+static int ath10k_download_cal_nvmem(struct ath10k *ar)
+{
+ int ret;
+ size_t len;
+ const void *file;
+ struct nvmem_cell *cell;
+ struct platform_device *pdev = of_find_device_by_node(ar->dev->of_node);
+
+ if (!pdev)
+ return -ENODEV;
+
+ cell = nvmem_cell_get(ar->dev, "pre-cal");
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+
+ file = nvmem_cell_read(cell, &len);
+ nvmem_cell_put(cell);
+
+ if (IS_ERR(file))
+ return PTR_ERR(file);
+
+ ret = ath10k_download_board_data(ar, file, len);
+ if (ret) {
+ ath10k_err(ar, "failed to download cal_file data: %d\n", ret);
+ goto err;
+ }
+
+ ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot cal file downloaded\n");
+
+ return 0;
+err:
+ kfree(file);
+ return ret;
+}
+
static int ath10k_download_cal_file(struct ath10k *ar,
const struct firmware *file)
{
@@ -2049,6 +2087,16 @@ static int ath10k_core_pre_cal_download(struct ath10k *ar)
goto success;
}

+ ath10k_dbg(ar, ATH10K_DBG_BOOT,
+ "boot did not find a pre calibration file, try NVMEM next: %d\n",
+ ret);
+
+ ret = ath10k_download_cal_nvmem(ar);
+ if (ret == 0) {
+ ar->cal_mode = ATH10K_PRE_CAL_MODE_NVMEM;
+ goto success;
+ }
+
ath10k_dbg(ar, ATH10K_DBG_BOOT,
"boot did not find a pre calibration file, try DT next: %d\n",
ret);
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 4cf5bd489..186aba73a 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -864,6 +864,7 @@ enum ath10k_cal_mode {
ATH10K_CAL_MODE_OTP,
ATH10K_CAL_MODE_DT,
ATH10K_PRE_CAL_MODE_FILE,
+ ATH10K_PRE_CAL_MODE_NVMEM,
ATH10K_PRE_CAL_MODE_DT,
ATH10K_CAL_MODE_EEPROM,
};
@@ -886,6 +887,8 @@ static inline const char *ath10k_cal_mode_str(enum ath10k_cal_mode mode)
return "dt";
case ATH10K_PRE_CAL_MODE_FILE:
return "pre-cal-file";
+ case ATH10K_PRE_CAL_MODE_NVMEM:
+ return "pre-cal-nvmem";
case ATH10K_PRE_CAL_MODE_DT:
return "pre-cal-dt";
case ATH10K_CAL_MODE_EEPROM:
--
2.27.0
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