[PATCH v2 0/2] ath10k: DT support for ath10k calibration variant

[PATCH v2 0/2] ath10k: DT support for ath10k calibration variant

[Sven Eckelmann]

From: Sven Eckelmann <sven-KaDOiPu9UxWEi8DpZVb4nw@public.gmane.org>

Hi,

here is the second version of the qcom,ath10k-calibration-variant support
patchset. I think the ath10k patch describes these changes the best:

Board Data File (BDF) is loaded upon driver boot-up procedure. The right
board data file is identified on QCA4019 using bus, bmi-chip-id and
bmi-board-id.

The problem, however, can occur when the (default) board data file cannot
fulfill with the vendor requirements and it is necessary to use a different
board data file.

This problem was solved for SMBIOS by adding a special SMBIOS type 0xF8.
Something similar has to be provided for systems without SMBIOS but with
device trees. No solution was specified by QCA and therefore a new one has
to be found for ath10k.

The device tree requires addition strings to define the variant name

    wifi@a000000 {
    	status = "okay";
    	qcom,ath10k-calibration-variant = "RT-AC58U";
    };

    wifi@a800000 {
    	status = "okay";
    	qcom,ath10k-calibration-variant = "RT-AC58U";
    };

This would create the boarddata identifiers for the board-2.bin search

 *  bus=ahb,bmi-chip-id=0,bmi-board-id=16,variant=RT-AC58U
 *  bus=ahb,bmi-chip-id=0,bmi-board-id=17,variant=RT-AC58U


The discussions to the old submissions can be found in:

RFC:
====

* https://patchwork.kernel.org/patch/9613615/

v1:
===

* https://patchwork.kernel.org/patch/9615183/
* https://patchwork.kernel.org/patch/9615185/

Changes since v1:
=================

* check the return value of strscpy and print debug message when buffer
  was not big enough (I would have preferred ath10k_warn but
  ath10k_core_check_bdfext disagreed)

Changes since RFC:
==================

* Split patch in DT doc and ath10k part (thanks Christian Lamparter)
* Remove the words "bmi-chip-id" and "bmi-board-id" and replace them with
  more generic "device specific ids"

Kind regards,
	Sven


Sven Eckelmann (2):
  dt: bindings: add new dt entry for ath10k calibration variant
  ath10k: search DT for qcom,ath10k-calibration-variant

 .../bindings/net/wireless/qcom,ath10k.txt          |  3 ++
 drivers/net/wireless/ath/ath10k/core.c             | 40 ++++++++++++++++++----
 2 files changed, 36 insertions(+), 7 deletions(-)

-- 
2.11.0

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[PATCH v2 1/2] dt: bindings: add new dt entry for ath10k calibration variant

[Sven Eckelmann]

The bus + bmi-chip-id + bmi-board-id is not enough to identify the correct
board data file on QCA4019 based devices. Multiple different boards share
the same values. Only the original reference designs can currently be
identified and loaded from the board-2.bin. But these will not result in
the correct calibration data when combined with the pre-calibration data
from the device.

An additional "variant" information has to be provided (via SMBIOS or DT)
to select the correct board data for a design which was modified by an ODM.

Signed-off-by: Sven Eckelmann <sven.eckelmann-lv6y7wLVQPlWk0Htik3J/w@public.gmane.org>
---
 Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
index 74d7f0af209c..3d2a031217da 100644
--- a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
+++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
@@ -41,6 +41,9 @@ Optional properties:
 - qcom,msi_addr: MSI interrupt address.
 - qcom,msi_base: Base value to add before writing MSI data into
 		MSI address register.
+- qcom,ath10k-calibration-variant: string to search for in the board-2.bin
+				   variant list with the same bus and device
+				   specific ids
 - qcom,ath10k-calibration-data : calibration data + board specific data
 				 as an array, the length can vary between
 				 hw versions.
-- 
2.11.0

[PATCH v2 2/2] ath10k: search DT for qcom,ath10k-calibration-variant

[Sven Eckelmann]

Board Data File (BDF) is loaded upon driver boot-up procedure. The right
board data file is identified on QCA4019 using bus, bmi-chip-id and
bmi-board-id.

The problem, however, can occur when the (default) board data file cannot
fulfill with the vendor requirements and it is necessary to use a different
board data file.

This problem was solved for SMBIOS by adding a special SMBIOS type 0xF8.
Something similar has to be provided for systems without SMBIOS but with
device trees. No solution was specified by QCA and therefore a new one has
to be found for ath10k.

The device tree requires addition strings to define the variant name

    wifi@a000000 {
    	status = "okay";
    	qcom,ath10k-calibration-variant = "RT-AC58U";
    };

    wifi@a800000 {
    	status = "okay";
    	qcom,ath10k-calibration-variant = "RT-AC58U";
    };

This would create the boarddata identifiers for the board-2.bin search

 *  bus=ahb,bmi-chip-id=0,bmi-board-id=16,variant=RT-AC58U
 *  bus=ahb,bmi-chip-id=0,bmi-board-id=17,variant=RT-AC58U

Signed-off-by: Sven Eckelmann <sven.eckelmann-lv6y7wLVQPlWk0Htik3J/w@public.gmane.org>
---
 drivers/net/wireless/ath/ath10k/core.c | 40 ++++++++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index b29fdbd21ead..6264e2cc4c0d 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -860,6 +860,28 @@ static int ath10k_core_check_smbios(struct ath10k *ar)
 	return 0;
 }
 
+static int ath10k_core_check_dt(struct ath10k *ar)
+{
+	struct device_node *node;
+	const char *variant = NULL;
+
+	node = ar->dev->of_node;
+	if (!node)
+		return -ENOENT;
+
+	of_property_read_string(node, "qcom,ath10k-calibration-variant",
+				&variant);
+	if (!variant)
+		return -ENODATA;
+
+	if (strscpy(ar->id.bdf_ext, variant, sizeof(ar->id.bdf_ext)) < 0)
+		ath10k_dbg(ar, ATH10K_DBG_BOOT,
+			   "bdf variant string is longer than the buffer can accommodate (variant: %s)\n",
+			    variant);
+
+	return 0;
+}
+
 static int ath10k_download_and_run_otp(struct ath10k *ar)
 {
 	u32 result, address = ar->hw_params.patch_load_addr;
@@ -1231,19 +1253,19 @@ static int ath10k_core_create_board_name(struct ath10k *ar, char *name,
 	/* strlen(',variant=') + strlen(ar->id.bdf_ext) */
 	char variant[9 + ATH10K_SMBIOS_BDF_EXT_STR_LENGTH] = { 0 };
 
+	if (ar->id.bdf_ext[0] != '\0')
+		scnprintf(variant, sizeof(variant), ",variant=%s",
+			  ar->id.bdf_ext);
+
 	if (ar->id.bmi_ids_valid) {
 		scnprintf(name, name_len,
-			  "bus=%s,bmi-chip-id=%d,bmi-board-id=%d",
+			  "bus=%s,bmi-chip-id=%d,bmi-board-id=%d%s",
 			  ath10k_bus_str(ar->hif.bus),
 			  ar->id.bmi_chip_id,
-			  ar->id.bmi_board_id);
+			  ar->id.bmi_board_id, variant);
 		goto out;
 	}
 
-	if (ar->id.bdf_ext[0] != '\0')
-		scnprintf(variant, sizeof(variant), ",variant=%s",
-			  ar->id.bdf_ext);

Re: [PATCH v2 1/2] dt: bindings: add new dt entry for ath10k calibration variant

[Rob Herring]

On Fri, Dec 08, 2017 at 11:37:41AM +0100, Sven Eckelmann wrote:
> The bus + bmi-chip-id + bmi-board-id is not enough to identify the correct
> board data file on QCA4019 based devices. Multiple different boards share
> the same values. Only the original reference designs can currently be
> identified and loaded from the board-2.bin. But these will not result in
> the correct calibration data when combined with the pre-calibration data
> from the device.
> 
> An additional "variant" information has to be provided (via SMBIOS or DT)
> to select the correct board data for a design which was modified by an ODM.
> 
> Signed-off-by: Sven Eckelmann <sven.eckelmann-lv6y7wLVQPlWk0Htik3J/w@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>                  
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Re: [v2, 1/2] dt: bindings: add new dt entry for ath10k calibration variant

[Kalle Valo]

Sven Eckelmann <sven.eckelmann-lv6y7wLVQPlWk0Htik3J/w@public.gmane.org> wrote:

> The bus + bmi-chip-id + bmi-board-id is not enough to identify the correct
> board data file on QCA4019 based devices. Multiple different boards share
> the same values. Only the original reference designs can currently be
> identified and loaded from the board-2.bin. But these will not result in
> the correct calibration data when combined with the pre-calibration data
> from the device.
> 
> An additional "variant" information has to be provided (via SMBIOS or DT)
> to select the correct board data for a design which was modified by an ODM.
> 
> Signed-off-by: Sven Eckelmann <sven.eckelmann-lv6y7wLVQPlWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Kalle Valo <kvalo-A+ZNKFmMK5xy9aJCnZT0Uw@public.gmane.org>

2 patches applied to ath-next branch of ath.git, thanks.

40fb0eab30ba dt: bindings: add new dt entry for ath10k calibration variant
d06f26c5c8a4 ath10k: search DT for qcom,ath10k-calibration-variant

-- 
https://patchwork.kernel.org/patch/10102249/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches