[PATCH v1] ath10k: fetch (pre-)calibration data via nvmem subsystem

[PATCH v1] ath10k: fetch (pre-)calibration data via nvmem subsystem

[Christian Lamparter]

On most embedded ath10k devices (like range extenders,
routers, accesspoints, ...) the calibration data is
stored in a easily accessible MTD partitions named
"ART", "caldata", "calibration", etc...

Since commit 4b361cfa8624 ("mtd: core: add OTP nvmem provider support"):
MTD partitions and portions of them can be specified
as potential nvmem-cells which are accessible through
the nvmem subsystem.

This feature - together with an nvmem cell definition either
in the platform data or via device-tree allows drivers to get
the (pre-)calibration data which is required for initializing
the WIFI.

Tested with Netgear EX6150v2 (IPQ4018)

Cc: Robert Marko <robimarko@gmail.com>
Cc: Thibaut Varène <hacks@slashdirt.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---

This idea came up during the discussion of:
"ath10k: support bus and device specific API 1 BDF selection"

I do not have a device which has the boardfile data stored
by the manufracturer in flash. So this patch only deals with
the (pre-)calibration data. I'll see if I can get hold of a
suitable QCA9880 device to test it as well.

I placed the new nvmem code in front of the current "file" method
(firmware_request) because it made it easier for me to test it.
If needed I can be moved to a different place as well.
---
 drivers/net/wireless/ath/ath10k/core.c | 64 +++++++++++++++++++++++++-
 drivers/net/wireless/ath/ath10k/core.h |  6 +++
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index c21e05549f61..3454d791ce76 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -12,6 +12,7 @@
 #include <linux/dmi.h>
 #include <linux/ctype.h>
 #include <linux/pm_qos.h>
+#include <linux/nvmem-consumer.h>
 #include <asm/byteorder.h>
 
 #include "core.h"
@@ -935,7 +936,8 @@ 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;
@@ -1726,7 +1728,8 @@ 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);
@@ -1853,6 +1856,39 @@ static int ath10k_download_cal_eeprom(struct ath10k *ar)
 	return ret;
 }
 
+static int ath10k_download_cal_nvmem(struct ath10k *ar, const char *cell_name)
+{
+	struct nvmem_cell *cell;
+	void *buf;
+	size_t len;
+	int ret;
+
+	cell = devm_nvmem_cell_get(ar->dev, cell_name);
+	if (IS_ERR(cell)) {
+		ret = PTR_ERR(cell);
+		return ret;
+	}
+
+	buf = nvmem_cell_read(cell, &len);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	if (ar->hw_params.cal_data_len != len) {
+		kfree(buf);
+		ath10k_warn(ar, "invalid calibration data length in nvmem-cell '%s': %ld != %d\n",
+			    cell_name, len, ar->hw_params.cal_data_len);
+		return -EMSGSIZE;
+	}
+
+	ret = ath10k_download_board_data(ar, buf, len);
+	kfree(buf);
+	if (ret)
+		ath10k_warn(ar, "failed to download calibration data from nvmem-cell '%s': %d\n",
+			    cell_name, ret);
+
+	return ret;
+}
+
 int ath10k_core_fetch_firmware_api_n(struct ath10k *ar, const char *name,
 				     struct ath10k_fw_file *fw_file)
 {
@@ -2087,6 +2123,18 @@ static int ath10k_core_pre_cal_download(struct ath10k *ar)
 {
 	int ret;
 
+	ret = ath10k_download_cal_nvmem(ar, "pre-calibration");
+	if (ret == 0) {
+		ar->cal_mode = ATH10K_PRE_CAL_MODE_NVMEM;
+		goto success;
+	} else if (ret == -EPROBE_DEFER) {
+		return ret;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_BOOT,
+		   "boot did not find a pre-calibration nvmem-cell, try file next: %d\n",
+		   ret);
+
 	ret = ath10k_download_cal_file(ar, ar->pre_cal_file);
 	if (ret == 0) {
 		ar->cal_mode = ATH10K_PRE_CAL_MODE_FILE;
@@ -2153,6 +2201,18 @@ static int ath10k_download_cal_data(struct ath10k *ar)
 		   "pre cal download procedure failed, try cal file: %d\n",
 		   ret);
 
+	ret = ath10k_download_cal_nvmem(ar, "calibration");
+	if (ret == 0) {
+		ar->cal_mode = ATH10K_CAL_MODE_NVMEM;
+		goto done;
+	} else if (ret == -EPROBE_DEFER) {
+		return ret;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_BOOT,
+		   "boot did not find a calibration nvmem-cell, try file next: %d\n",
+		   ret);
+
 	ret = ath10k_download_cal_file(ar, ar->cal_file);
 	if (ret == 0) {
 		ar->cal_mode = ATH10K_CAL_MODE_FILE;
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 5aeff2d9f6cf..9f6680b3be0a 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -877,8 +877,10 @@ enum ath10k_cal_mode {
 	ATH10K_CAL_MODE_FILE,
 	ATH10K_CAL_MODE_OTP,
 	ATH10K_CAL_MODE_DT,
+	ATH10K_CAL_MODE_NVMEM,
 	ATH10K_PRE_CAL_MODE_FILE,
 	ATH10K_PRE_CAL_MODE_DT,
+	ATH10K_PRE_CAL_MODE_NVMEM,
 	ATH10K_CAL_MODE_EEPROM,
 };
 
@@ -898,10 +900,14 @@ static inline const char *ath10k_cal_mode_str(enum ath10k_cal_mode mode)
 		return "otp";
 	case ATH10K_CAL_MODE_DT:
 		return "dt";
+	case ATH10K_CAL_MODE_NVMEM:
+		return "nvmem";
 	case ATH10K_PRE_CAL_MODE_FILE:
 		return "pre-cal-file";
 	case ATH10K_PRE_CAL_MODE_DT:
 		return "pre-cal-dt";
+	case ATH10K_PRE_CAL_MODE_NVMEM:
+		return "pre-cal-nvmem";
 	case ATH10K_CAL_MODE_EEPROM:
 		return "eeprom";
 	}
-- 
2.33.0


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Re: [PATCH v1] ath10k: fetch (pre-)calibration data via nvmem subsystem

[kernel test robot]

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Hi Christian,

I love your patch! Perhaps something to improve:

[auto build test WARNING on kvalo-ath/ath-next]
[also build test WARNING on kvalo-wireless-drivers-next/master kvalo-wireless-drivers/master v5.15-rc5 next-20211015]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Christian-Lamparter/ath10k-fetch-pre-calibration-data-via-nvmem-subsystem/20211016-041140
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git ath-next
config: i386-randconfig-c001-20211015 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 6069a6a5049497a32a50a49661c2f4169078bdba)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/9a08dd8f5ae4d035f503db3a64ed4c6869b038e3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Christian-Lamparter/ath10k-fetch-pre-calibration-data-via-nvmem-subsystem/20211016-041140
        git checkout 9a08dd8f5ae4d035f503db3a64ed4c6869b038e3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/net/wireless/ath/ath10k/core.c:1879:19: warning: format specifies type 'long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
                               cell_name, len, ar->hw_params.cal_data_len);
                                          ^~~
   1 warning generated.


vim +1879 drivers/net/wireless/ath/ath10k/core.c

  1858	
  1859	static int ath10k_download_cal_nvmem(struct ath10k *ar, const char *cell_name)
  1860	{
  1861		struct nvmem_cell *cell;
  1862		void *buf;
  1863		size_t len;
  1864		int ret;
  1865	
  1866		cell = devm_nvmem_cell_get(ar->dev, cell_name);
  1867		if (IS_ERR(cell)) {
  1868			ret = PTR_ERR(cell);
  1869			return ret;
  1870		}
  1871	
  1872		buf = nvmem_cell_read(cell, &len);
  1873		if (IS_ERR(buf))
  1874			return PTR_ERR(buf);
  1875	
  1876		if (ar->hw_params.cal_data_len != len) {
  1877			kfree(buf);
  1878			ath10k_warn(ar, "invalid calibration data length in nvmem-cell '%s': %ld != %d\n",
> 1879				    cell_name, len, ar->hw_params.cal_data_len);
  1880			return -EMSGSIZE;
  1881		}
  1882	
  1883		ret = ath10k_download_board_data(ar, buf, len);
  1884		kfree(buf);
  1885		if (ret)
  1886			ath10k_warn(ar, "failed to download calibration data from nvmem-cell '%s': %d\n",
  1887				    cell_name, ret);
  1888	
  1889		return ret;
  1890	}
  1891	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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