[PATCH v4 0/3] ath10k: Add support to configure BB timing for external FEM

[PATCH v4 0/3] ath10k: Add support to configure BB timing for external FEM

[Bhagavathi Perumal S]

This adds support to choose correct Base Band(BB) timing values based on
the input Front End Module(FEM) hardware name from Device Tree entry and
configure it in hardware through WMI interface. Since the BB timing values
can vary between FEM hardwares and not same as default value used
in reference hardware.

Bhagavathi Perumal S (3):
  dt-bindings: net: ath10k: fix node name and device type in qcom ath10k
    example
  dt-bindings: net: ath10k: add new dt entry to identify external FEM
  ath10k: Add support to configure BB timing over wmi

v2:
 Addressed review comments in dt:
  * Fixed node name and device type with new dt patch "dt-bindings: net: ath10k:
     fix node name and device type in qcom ath10k example".
  * Changed the dt patch subject to "dt-bindings: net: ath10k: add new dt entry
    to identify external FEM".
  * Added new property in existing example.
  * Enumarated some valid FEM names.

v3:
 Addressed review comments in valid fem names.

v4:
 Corrected typo error in the commit log of PATCH 1/3.

 .../bindings/net/wireless/qcom,ath10k.txt          | 12 ++++--
 drivers/net/wireless/ath/ath10k/mac.c              | 47 ++++++++++++++++++++++
 drivers/net/wireless/ath/ath10k/wmi-ops.h          | 20 +++++++++
 drivers/net/wireless/ath/ath10k/wmi.c              | 23 +++++++++++
 drivers/net/wireless/ath/ath10k/wmi.h              | 26 ++++++++++++
 5 files changed, 125 insertions(+), 3 deletions(-)

-- 
1.9.1

[PATCH v4 1/3] dt-bindings: net: ath10k: fix node name and device type in qcom ath10k example

[Bhagavathi Perumal S]

In qcom,ath10k documentation, ath10k is used as node name in the example of
pci based device. Normally, node name should be class of device and not the
model name, so fix it to node name "wifi". And remove the property device_type
pci since only pci bridges should have this property.

Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
---
 Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
index 2196d1a..ef60f25 100644
--- a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
+++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
@@ -74,9 +74,8 @@ pci {
 		#address-cells = <3>;
 		device_type = "pci";
 
-		ath10k@0,0 {
+		wifi@0,0 {
 			reg = <0 0 0 0 0>;
-			device_type = "pci";
 			qcom,ath10k-calibration-data = [ 01 02 03 ... ];
 		};
 	};
-- 
1.9.1

Re: [PATCH v4 1/3] dt-bindings: net: ath10k: fix node name and device type in qcom ath10k example

[Rob Herring]

On Tue, 11 Dec 2018 21:43:22 +0530, Bhagavathi Perumal S wrote:
> In qcom,ath10k documentation, ath10k is used as node name in the example of
> pci based device. Normally, node name should be class of device and not the
> model name, so fix it to node name "wifi". And remove the property device_type
> pci since only pci bridges should have this property.
> 
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 1/3] dt-bindings: net: ath10k: fix node name and device type in qcom ath10k example

[Kalle Valo]

Bhagavathi Perumal S <bperumal@codeaurora.org> wrote:

> In qcom,ath10k documentation, ath10k is used as node name in the example of
> pci based device. Normally, node name should be class of device and not the
> model name, so fix it to node name "wifi". And remove the property device_type
> pci since only pci bridges should have this property.
> 
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

e5404969a335 dt-bindings: net: ath10k: fix node name and device type in qcom ath10k example
f3f587995c5a dt-bindings: net: ath10k: add new dt entry to identify external FEM
84758d4d43e9 ath10k: add support to configure BB timing over wmi

-- 
https://patchwork.kernel.org/patch/10724123/

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

[PATCH v4 2/3] dt-bindings: net: ath10k: add new dt entry to identify external FEM

[Bhagavathi Perumal S]

This adds new dt entry ext-fem-name, it is used by ath10k driver
to select correct timing parameters and configure it in target wifi hardware.
The Front End Module(FEM) normally includes tx power amplifier(PA) and
rx low noise amplifier(LNA). The default timing parameters like tx end to
PA off timing values were fine tuned for internal FEM used in reference
design. And these timing values can not be same if ODM modifies hardware
design with different external FEM. This DT entry helps to choose correct
timing values in driver if different external FEM hardware used.

Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
---
 Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
index ef60f25..71530fd 100644
--- a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
+++ b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
@@ -61,8 +61,14 @@ Optional properties:
 	Value type: <phandle>
 	Definition: reference to the reserved-memory for the msa region
 		    used by the wifi firmware running in Q6.
+- ext-fem-name:
+	Usage: Optional
+	Value type: string
+	Definition: Name of external front end module used. Some valid FEM names
+		    for example: "microsemi-lx5586", "sky85703-11"
+		    and "sky85803" etc.
 
-Example (to supply the calibration data alone):
+Example (to supply PCI based wifi block details):
 
 In this example, the node is defined as child node of the PCI controller.
 
@@ -77,6 +83,7 @@ pci {
 		wifi@0,0 {
 			reg = <0 0 0 0 0>;
 			qcom,ath10k-calibration-data = [ 01 02 03 ... ];
+			ext-fem-name = "microsemi-lx5586";
 		};
 	};
 };
-- 
1.9.1

Re: [PATCH v4 2/3] dt-bindings: net: ath10k: add new dt entry to identify external FEM

[Rob Herring]

On Tue, Dec 11, 2018 at 09:43:23PM +0530, Bhagavathi Perumal S wrote:
> This adds new dt entry ext-fem-name, it is used by ath10k driver
> to select correct timing parameters and configure it in target wifi hardware.
> The Front End Module(FEM) normally includes tx power amplifier(PA) and
> rx low noise amplifier(LNA). The default timing parameters like tx end to
> PA off timing values were fine tuned for internal FEM used in reference
> design. And these timing values can not be same if ODM modifies hardware
> design with different external FEM. This DT entry helps to choose correct
> timing values in driver if different external FEM hardware used.
> 
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Please add acks/reviewed-bys when posting new versions.

Re: [PATCH v4 2/3] dt-bindings: net: ath10k: add new dt entry to identify external FEM

[Kalle Valo]

Rob Herring <robh@kernel.org> writes:

> On Tue, Dec 11, 2018 at 09:43:23PM +0530, Bhagavathi Perumal S wrote:
>> This adds new dt entry ext-fem-name, it is used by ath10k driver
>> to select correct timing parameters and configure it in target wifi hardware.
>> The Front End Module(FEM) normally includes tx power amplifier(PA) and
>> rx low noise amplifier(LNA). The default timing parameters like tx end to
>> PA off timing values were fine tuned for internal FEM used in reference
>> design. And these timing values can not be same if ODM modifies hardware
>> design with different external FEM. This DT entry helps to choose correct
>> timing values in driver if different external FEM hardware used.
>> 
>> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
>> ---
>>  Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> Please add acks/reviewed-bys when posting new versions.

I added your reviewed-by from v3 in the pending branch:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=2f4f5a81c87b9be68aa087c238e2f2b9debbfa1b

-- 
Kalle Valo

[PATCH v4 3/3] ath10k: Add support to configure BB timing over wmi

[Bhagavathi Perumal S]

Add wmi configuration cmd to configure base band(BB) power amplifier(PA)
off timing values in hardware. The default PA off timings were fine tuned
to make proper DFS radar detection in QCA reference design. If ODM uses
different PA in their design, then the same default PA off timing values
cannot be used, it requires different settling time to detect radar pulses
very sooner and avoid radar detection problems. In that case it provides
provision to select proper PA off timing values based on the PA hardware used.
The PA component is part of FEM hardware and new device tree entry
"ext-fem-name" is used to indentify the FEM hardware. And this wmi configuration
cmd is enabled via wmi service flag "WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT".

Other way is to apply these values through calibration data, but recalibration
of all boards out there might not be feasible.

This change tested on firmware ver 10.2.4-1.0-00042 in QCA988X chipset.

Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/mac.c     | 47 +++++++++++++++++++++++++++++++
 drivers/net/wireless/ath/ath10k/wmi-ops.h | 20 +++++++++++++
 drivers/net/wireless/ath/ath10k/wmi.c     | 23 +++++++++++++++
 drivers/net/wireless/ath/ath10k/wmi.h     | 26 +++++++++++++++++
 4 files changed, 116 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 1db2a30..5a1c9b6 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -22,6 +22,7 @@
 #include <net/mac80211.h>
 #include <linux/etherdevice.h>
 #include <linux/acpi.h>
+#include <linux/of.h>
 
 #include "hif.h"
 #include "core.h"
@@ -4637,11 +4638,44 @@ static int ath10k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 	return ret;
 }
 
+static int __ath10k_fetch_bb_timing_dt(struct ath10k *ar,
+				       struct wmi_bb_timing_cfg_arg *bb_timing)
+{
+	struct device_node *node;
+	const char *fem_name;
+	int ret;
+
+	node = ar->dev->of_node;
+	if (!node)
+		return -ENOENT;
+
+	ret = of_property_read_string_index(node, "ext-fem-name", 0, &fem_name);
+	if (ret)
+		return -ENOENT;
+
+	/*
+	 * If external Front End module used in hardware, then default base band timing
+	 * parameter cannot be used since they were fine tuned for reference hardware,
+	 * so choosing different value suitable for that external FEM.
+	 */
+	if (!strcmp("microsemi-lx5586", fem_name)) {
+		bb_timing->bb_tx_timing = 0x00;
+		bb_timing->bb_xpa_timing = 0x0101;
+	} else {
+		return -ENOENT;
+	}
+
+	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot bb_tx_timing 0x%x bb_xpa_timing 0x%x\n",
+		   bb_timing->bb_tx_timing, bb_timing->bb_xpa_timing);
+	return 0;
+}
+
 static int ath10k_start(struct ieee80211_hw *hw)
 {
 	struct ath10k *ar = hw->priv;
 	u32 param;
 	int ret = 0;
+	struct wmi_bb_timing_cfg_arg bb_timing = {0};
 
 	/*
 	 * This makes sense only when restarting hw. It is harmless to call
@@ -4796,6 +4830,19 @@ static int ath10k_start(struct ieee80211_hw *hw)
 		clear_bit(ATH10K_FLAG_BTCOEX, &ar->dev_flags);
 	}
 
+	if (test_bit(WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT, ar->wmi.svc_map)) {
+		ret = __ath10k_fetch_bb_timing_dt(ar, &bb_timing);
+		if (!ret) {
+			ret = ath10k_wmi_pdev_bb_timing(ar, &bb_timing);
+			if (ret) {
+				ath10k_warn(ar,
+					    "failed to set bb timings: %d\n",
+					    ret);
+				goto err_core_stop;
+			}
+		}
+	}
+
 	ar->num_started_vdevs = 0;
 	ath10k_regd_update(ar);
 
diff --git a/drivers/net/wireless/ath/ath10k/wmi-ops.h b/drivers/net/wireless/ath/ath10k/wmi-ops.h
index 7978a77..0466307 100644
--- a/drivers/net/wireless/ath/ath10k/wmi-ops.h
+++ b/drivers/net/wireless/ath/ath10k/wmi-ops.h
@@ -219,6 +219,9 @@ struct wmi_ops {
 	struct sk_buff *(*gen_echo)(struct ath10k *ar, u32 value);
 	struct sk_buff *(*gen_pdev_get_tpc_table_cmdid)(struct ath10k *ar,
 							u32 param);
+	struct sk_buff *(*gen_bb_timing)
+			(struct ath10k *ar,
+			 const struct wmi_bb_timing_cfg_arg *arg);
 
 };
 
@@ -1576,4 +1579,21 @@ struct wmi_ops {
 				   ar->wmi.cmd->radar_found_cmdid);
 }
 
+static inline int
+ath10k_wmi_pdev_bb_timing(struct ath10k *ar,
+			  const struct wmi_bb_timing_cfg_arg *arg)
+{
+	struct sk_buff *skb;
+
+	if (!ar->wmi.ops->gen_bb_timing)
+		return -EOPNOTSUPP;
+
+	skb = ar->wmi.ops->gen_bb_timing(ar, arg);
+
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	return ath10k_wmi_cmd_send(ar, skb,
+				   ar->wmi.cmd->set_bb_timing_cmdid);
+}
 #endif
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 659513b..a1e8695 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -539,6 +539,7 @@
 		WMI_10_2_PDEV_BSS_CHAN_INFO_REQUEST_CMDID,
 	.pdev_get_tpc_table_cmdid = WMI_CMD_UNSUPPORTED,
 	.radar_found_cmdid = WMI_CMD_UNSUPPORTED,
+	.set_bb_timing_cmdid = WMI_10_2_PDEV_SET_BB_TIMING_CONFIG_CMDID,
 };
 
 /* 10.4 WMI cmd track */
@@ -8839,6 +8840,27 @@ static u32 ath10k_wmi_prepare_peer_qos(u8 uapsd_queues, u8 sp)
 	return 0;
 }
 
+static struct sk_buff *
+ath10k_wmi_10_2_4_op_gen_bb_timing(struct ath10k *ar,
+				   const struct wmi_bb_timing_cfg_arg *arg)
+{
+	struct wmi_pdev_bb_timing_cfg_cmd *cmd;
+	struct sk_buff *skb;
+
+	skb = ath10k_wmi_alloc_skb(ar, sizeof(*cmd));
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	cmd = (struct wmi_pdev_bb_timing_cfg_cmd *)skb->data;
+	cmd->bb_tx_timing = __cpu_to_le32(arg->bb_tx_timing);
+	cmd->bb_xpa_timing = __cpu_to_le32(arg->bb_xpa_timing);
+
+	ath10k_dbg(ar, ATH10K_DBG_WMI,
+		   "wmi pdev bb_tx_timing 0x%x bb_xpa_timing 0x%x\n",
+		   arg->bb_tx_timing, arg->bb_xpa_timing);
+	return skb;
+}
+
 static const struct wmi_ops wmi_ops = {
 	.rx = ath10k_wmi_op_rx,
 	.map_svc = wmi_main_svc_map,
@@ -9112,6 +9134,7 @@ static u32 ath10k_wmi_prepare_peer_qos(u8 uapsd_queues, u8 sp)
 	.gen_pdev_enable_adaptive_cca =
 		ath10k_wmi_op_gen_pdev_enable_adaptive_cca,
 	.get_vdev_subtype = ath10k_wmi_10_2_4_op_get_vdev_subtype,
+	.gen_bb_timing = ath10k_wmi_10_2_4_op_gen_bb_timing,
 	/* .gen_bcn_tmpl not implemented */
 	/* .gen_prb_tmpl not implemented */
 	/* .gen_p2p_go_bcn_ie not implemented */
diff --git a/drivers/net/wireless/ath/ath10k/wmi.h b/drivers/net/wireless/ath/ath10k/wmi.h
index 58e33ab..5e18dc0 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.h
+++ b/drivers/net/wireless/ath/ath10k/wmi.h
@@ -205,6 +205,7 @@ enum wmi_service {
 	WMI_SERVICE_SPOOF_MAC_SUPPORT,
 	WMI_SERVICE_TX_DATA_ACK_RSSI,
 	WMI_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT,
+	WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT,
 
 	/* keep last */
 	WMI_SERVICE_MAX,
@@ -244,6 +245,9 @@ enum wmi_10x_service {
 	WMI_10X_SERVICE_PEER_STATS,
 	WMI_10X_SERVICE_RESET_CHIP,
 	WMI_10X_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS,
+	WMI_10X_SERVICE_VDEV_BCN_RATE_CONTROL,
+	WMI_10X_SERVICE_PER_PACKET_SW_ENCRYPT,
+	WMI_10X_SERVICE_BB_TIMING_CONFIG_SUPPORT,
 };
 
 enum wmi_main_service {
@@ -568,6 +572,8 @@ static inline void wmi_10x_svc_map(const __le32 *in, unsigned long *out,
 	       WMI_SERVICE_RESET_CHIP, len);
 	SVCMAP(WMI_10X_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS,
 	       WMI_SERVICE_HTT_MGMT_TX_COMP_VALID_FLAGS, len);
+	SVCMAP(WMI_10X_SERVICE_BB_TIMING_CONFIG_SUPPORT,
+	       WMI_SERVICE_BB_TIMING_CONFIG_SUPPORT, len);
 }
 
 static inline void wmi_main_svc_map(const __le32 *in, unsigned long *out,
@@ -986,6 +992,7 @@ struct wmi_cmd_map {
 	u32 pdev_wds_entry_list_cmdid;
 	u32 tdls_set_offchan_mode_cmdid;
 	u32 radar_found_cmdid;
+	u32 set_bb_timing_cmdid;
 };
 
 /*
@@ -1601,6 +1608,8 @@ enum wmi_10_2_cmd_id {
 	WMI_10_2_SET_LTEU_CONFIG_CMDID,
 	WMI_10_2_SET_CCA_PARAMS,
 	WMI_10_2_PDEV_BSS_CHAN_INFO_REQUEST_CMDID,
+	WMI_10_2_FWTEST_CMDID,
+	WMI_10_2_PDEV_SET_BB_TIMING_CONFIG_CMDID,
 	WMI_10_2_PDEV_UTF_CMDID = WMI_10_2_END_CMDID - 1,
 };
 
@@ -7153,6 +7162,23 @@ struct wmi_pdev_chan_info_req_cmd {
 	__le32 reserved;
 } __packed;
 
+/* bb timing register configurations */
+struct wmi_bb_timing_cfg_arg {
+	/* Tx_end to pa off timing */
+	u32 bb_tx_timing;
+
+	/* Tx_end to external pa off timing */
+	u32 bb_xpa_timing;
+};
+
+struct wmi_pdev_bb_timing_cfg_cmd {
+	/* Tx_end to pa off timing */
+	__le32 bb_tx_timing;
+
+	/* Tx_end to external pa off timing */
+	__le32 bb_xpa_timing;
+} __packed;
+
 struct ath10k;
 struct ath10k_vif;
 struct ath10k_fw_stats_pdev;
-- 
1.9.1