diff mbox series

[K,2/4] mt76: mt7921: introduce ACPI SAR support

Message ID 20221121055537.3796-3-aaron.ma@canonical.com
State New
Headers show
Series Mediatek WLAN RZ616(MT7922) SAR table control | expand

Commit Message

Aaron Ma Nov. 21, 2022, 5:55 a.m. UTC
From: Deren Wu <deren.wu@mediatek.com>

BugLink: https://bugs.launchpad.net/bugs/1997200

In ACPI SAR enabled device, mt7921 should read power limit in ACPI config.
The limit value would be applied to regular tx power settings in mt76.

Two major functionalities added:
1. Get SAR power table through ACPI.
2. Read power in Dynamic/Geo SAR table for tx power limit.

Table note
MTDS: Dynamic SAR table
MTGS: Geo SAR table
MTCL: Country List table (for 6GHz support)

Reviewed-by: Sean Wang <sean.wang@mediatek.com>
Co-developed-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Co-developed-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit f965333e491e36adb0fa91e389fba8685b704fb6)
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
---
 .../wireless/mediatek/mt76/mt7921/Makefile    |   1 +
 .../wireless/mediatek/mt76/mt7921/acpi_sar.c  | 279 ++++++++++++++++++
 .../wireless/mediatek/mt76/mt7921/acpi_sar.h  |  93 ++++++
 .../net/wireless/mediatek/mt76/mt7921/init.c  |   2 +
 .../wireless/mediatek/mt76/mt7921/mt7921.h    |  20 ++
 5 files changed, 395 insertions(+)
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
 create mode 100644 drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
diff mbox series

Patch

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/Makefile b/drivers/net/wireless/mediatek/mt76/mt7921/Makefile
index 0a146818c6231..e5d2d2e131a2b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/Makefile
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/Makefile
@@ -9,6 +9,7 @@  CFLAGS_trace.o := -I$(src)
 
 mt7921-common-y := mac.o mcu.o main.o init.o debugfs.o trace.o
 mt7921-common-$(CONFIG_NL80211_TESTMODE) += testmode.o
+mt7921-common-$(CONFIG_ACPI) += acpi_sar.o
 mt7921e-y := pci.o pci_mac.o pci_mcu.o dma.o
 mt7921s-y := sdio.o sdio_mac.o sdio_mcu.o
 mt7921u-y := usb.o usb_mac.o
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
new file mode 100644
index 0000000000000..be4f07ad3af91
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c
@@ -0,0 +1,279 @@ 
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2022 MediaTek Inc. */
+
+#include <linux/acpi.h>
+#include "mt7921.h"
+
+static int
+mt7921_acpi_read(struct mt7921_dev *dev, u8 *method, u8 **tbl, u32 *len)
+{
+	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *sar_root, *sar_unit;
+	struct mt76_dev *mdev = &dev->mt76;
+	acpi_handle root, handle;
+	acpi_status status;
+	u32 i = 0;
+
+	root = ACPI_HANDLE(mdev->dev);
+	if (!root)
+		return -EOPNOTSUPP;
+
+	status = acpi_get_handle(root, method, &handle);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	status = acpi_evaluate_object(handle, NULL, NULL, &buf);
+	if (ACPI_FAILURE(status))
+		return -EIO;
+
+	sar_root = buf.pointer;
+	if (sar_root->type != ACPI_TYPE_PACKAGE ||
+	    sar_root->package.count < 4 ||
+	    sar_root->package.elements[0].type != ACPI_TYPE_INTEGER) {
+		dev_err(mdev->dev, "sar cnt = %d\n",
+			sar_root->package.count);
+		goto free;
+	}
+
+	if (!*tbl) {
+		*tbl = devm_kzalloc(mdev->dev, sar_root->package.count,
+				    GFP_KERNEL);
+		if (!*tbl)
+			goto free;
+	}
+	if (len)
+		*len = sar_root->package.count;
+
+	for (i = 0; i < sar_root->package.count; i++) {
+		sar_unit = &sar_root->package.elements[i];
+
+		if (sar_unit->type != ACPI_TYPE_INTEGER)
+			break;
+		*(*tbl + i) = (u8)sar_unit->integer.value;
+	}
+free:
+	kfree(sar_root);
+
+	return (i == sar_root->package.count) ? 0 : -EINVAL;
+}
+
+/* MTCL : Country List Table for 6G band */
+static int
+mt7921_asar_acpi_read_mtcl(struct mt7921_dev *dev, u8 **table, u8 *version)
+{
+	*version = (mt7921_acpi_read(dev, MT7921_ACPI_MTCL, table, NULL) < 0)
+		   ? 1 : 2;
+	return 0;
+}
+
+/* MTDS : Dynamic SAR Power Table */
+static int
+mt7921_asar_acpi_read_mtds(struct mt7921_dev *dev, u8 **table, u8 version)
+{
+	int len, ret, sarlen, prelen, tblcnt;
+	bool enable;
+
+	ret = mt7921_acpi_read(dev, MT7921_ACPI_MTDS, table, &len);
+	if (ret)
+		return ret;
+
+	/* Table content validation */
+	switch (version) {
+	case 1:
+		enable = ((struct mt7921_asar_dyn *)*table)->enable;
+		sarlen = sizeof(struct mt7921_asar_dyn_limit);
+		prelen = sizeof(struct mt7921_asar_dyn);
+		break;
+	case 2:
+		enable = ((struct mt7921_asar_dyn_v2 *)*table)->enable;
+		sarlen = sizeof(struct mt7921_asar_dyn_limit_v2);
+		prelen = sizeof(struct mt7921_asar_dyn_v2);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	tblcnt = (len - prelen) / sarlen;
+	if (!enable ||
+	    tblcnt > MT7921_ASAR_MAX_DYN || tblcnt < MT7921_ASAR_MIN_DYN)
+		ret = -EINVAL;
+
+	return ret;
+}
+
+/* MTGS : Geo SAR Power Table */
+static int
+mt7921_asar_acpi_read_mtgs(struct mt7921_dev *dev, u8 **table, u8 version)
+{
+	int len, ret = 0, sarlen, prelen, tblcnt;
+
+	ret = mt7921_acpi_read(dev, MT7921_ACPI_MTGS, table, &len);
+	if (ret)
+		return ret;
+
+	/* Table content validation */
+	switch (version) {
+	case 1:
+		sarlen = sizeof(struct mt7921_asar_geo_limit);
+		prelen = sizeof(struct mt7921_asar_geo);
+		break;
+	case 2:
+		sarlen = sizeof(struct mt7921_asar_geo_limit_v2);
+		prelen = sizeof(struct mt7921_asar_geo_v2);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	tblcnt = (len - prelen) / sarlen;
+	if (tblcnt > MT7921_ASAR_MAX_GEO || tblcnt < MT7921_ASAR_MIN_GEO)
+		ret = -EINVAL;
+
+	return ret;
+}
+
+int mt7921_init_acpi_sar(struct mt7921_dev *dev)
+{
+	struct mt7921_acpi_sar *asar;
+	int ret;
+
+	asar = devm_kzalloc(dev->mt76.dev, sizeof(*asar), GFP_KERNEL);
+	if (!asar)
+		return -ENOMEM;
+
+	mt7921_asar_acpi_read_mtcl(dev, (u8 **)&asar->countrylist, &asar->ver);
+
+	/* MTDS is mandatory. Return error if table is invalid */
+	ret = mt7921_asar_acpi_read_mtds(dev, (u8 **)&asar->dyn, asar->ver);
+	if (ret) {
+		devm_kfree(dev->mt76.dev, asar->dyn);
+		devm_kfree(dev->mt76.dev, asar->countrylist);
+		devm_kfree(dev->mt76.dev, asar);
+		return ret;
+	}
+
+	/* MTGS is optional */
+	ret = mt7921_asar_acpi_read_mtgs(dev, (u8 **)&asar->geo, asar->ver);
+	if (ret) {
+		devm_kfree(dev->mt76.dev, asar->geo);
+		asar->geo = NULL;
+	}
+
+	dev->phy.acpisar = asar;
+
+	return 0;
+}
+
+static s8
+mt7921_asar_get_geo_pwr(struct mt7921_phy *phy,
+			enum nl80211_band band, s8 dyn_power)
+{
+	struct mt7921_acpi_sar *asar = phy->acpisar;
+	struct mt7921_asar_geo_band *band_pwr;
+	s8 geo_power;
+	u8 idx, max;
+
+	if (!asar->geo)
+		return dyn_power;
+
+	switch (phy->mt76->dev->region) {
+	case NL80211_DFS_FCC:
+		idx = 0;
+		break;
+	case NL80211_DFS_ETSI:
+		idx = 1;
+		break;
+	default: /* WW */
+		idx = 2;
+		break;
+	}
+
+	if (asar->ver == 1) {
+		band_pwr = &asar->geo->tbl[idx].band[0];
+		max = ARRAY_SIZE(asar->geo->tbl[idx].band);
+	} else {
+		band_pwr = &asar->geo_v2->tbl[idx].band[0];
+		max = ARRAY_SIZE(asar->geo_v2->tbl[idx].band);
+	}
+
+	switch (band) {
+	case NL80211_BAND_2GHZ:
+		idx = 0;
+		break;
+	case NL80211_BAND_5GHZ:
+		idx = 1;
+		break;
+	case NL80211_BAND_6GHZ:
+		idx = 2;
+		break;
+	default:
+		return dyn_power;
+	}
+
+	if (idx >= max)
+		return dyn_power;
+
+	geo_power = (band_pwr + idx)->pwr;
+	dyn_power += (band_pwr + idx)->offset;
+
+	return min(geo_power, dyn_power);
+}
+
+static s8
+mt7921_asar_range_pwr(struct mt7921_phy *phy,
+		      const struct cfg80211_sar_freq_ranges *range,
+		      u8 idx)
+{
+	const struct cfg80211_sar_capa *capa = phy->mt76->hw->wiphy->sar_capa;
+	struct mt7921_acpi_sar *asar = phy->acpisar;
+	u8 *limit, band, max;
+
+	if (!capa)
+		return 127;
+
+	if (asar->ver == 1) {
+		limit = &asar->dyn->tbl[0].frp[0];
+		max = ARRAY_SIZE(asar->dyn->tbl[0].frp);
+	} else {
+		limit = &asar->dyn_v2->tbl[0].frp[0];
+		max = ARRAY_SIZE(asar->dyn_v2->tbl[0].frp);
+	}
+
+	if (idx >= max)
+		return 127;
+
+	if (range->start_freq >= 5945)
+		band = NL80211_BAND_6GHZ;
+	else if (range->start_freq >= 5150)
+		band = NL80211_BAND_5GHZ;
+	else
+		band = NL80211_BAND_2GHZ;
+
+	return mt7921_asar_get_geo_pwr(phy, band, limit[idx]);
+}
+
+int mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default)
+{
+	const struct cfg80211_sar_capa *capa = phy->mt76->hw->wiphy->sar_capa;
+	int i;
+
+	if (!phy->acpisar)
+		return 0;
+
+	/* When ACPI SAR enabled in HW, we should apply rules for .frp
+	 * 1. w/o .sar_specs : set ACPI SAR power as the defatul value
+	 * 2. w/  .sar_specs : set power with min(.sar_specs, ACPI_SAR)
+	 */
+	for (i = 0; i < capa->num_freq_ranges; i++) {
+		struct mt76_freq_range_power *frp = &phy->mt76->frp[i];
+
+		frp->range = set_default ? &capa->freq_ranges[i] : frp->range;
+		if (!frp->range)
+			continue;
+
+		frp->power = min_t(s8, set_default ? 127 : frp->power,
+				   mt7921_asar_range_pwr(phy, frp->range, i));
+	}
+
+	return 0;
+}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
new file mode 100644
index 0000000000000..23f86bfae0c05
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h
@@ -0,0 +1,93 @@ 
+/* SPDX-License-Identifier: ISC */
+/* Copyright (C) 2022 MediaTek Inc. */
+
+#ifndef __MT7921_ACPI_SAR_H
+#define __MT7921_ACPI_SAR_H
+
+#define MT7921_ASAR_MIN_DYN		1
+#define MT7921_ASAR_MAX_DYN		8
+#define MT7921_ASAR_MIN_GEO		3
+#define MT7921_ASAR_MAX_GEO		8
+
+#define MT7921_ACPI_MTCL		"MTCL"
+#define MT7921_ACPI_MTDS		"MTDS"
+#define MT7921_ACPI_MTGS		"MTGS"
+
+struct mt7921_asar_dyn_limit {
+	u8 idx;
+	u8 frp[5];
+} __packed;
+
+struct mt7921_asar_dyn {
+	u8 names[4];
+	u8 enable;
+	u8 nr_tbl;
+	struct mt7921_asar_dyn_limit tbl[0];
+} __packed;
+
+struct mt7921_asar_dyn_limit_v2 {
+	u8 idx;
+	u8 frp[11];
+} __packed;
+
+struct mt7921_asar_dyn_v2 {
+	u8 names[4];
+	u8 enable;
+	u8 rsvd;
+	u8 nr_tbl;
+	struct mt7921_asar_dyn_limit_v2 tbl[0];
+} __packed;
+
+struct mt7921_asar_geo_band {
+	u8 pwr;
+	u8 offset;
+} __packed;
+
+struct mt7921_asar_geo_limit {
+	u8 idx;
+	/* 0:2G, 1:5G */
+	struct mt7921_asar_geo_band band[2];
+} __packed;
+
+struct mt7921_asar_geo {
+	u8 names[4];
+	u8 version;
+	u8 nr_tbl;
+	struct mt7921_asar_geo_limit tbl[0];
+} __packed;
+
+struct mt7921_asar_geo_limit_v2 {
+	u8 idx;
+	/* 0:2G, 1:5G, 2:6G */
+	struct mt7921_asar_geo_band band[3];
+} __packed;
+
+struct mt7921_asar_geo_v2 {
+	u8 names[4];
+	u8 version;
+	u8 rsvd;
+	u8 nr_tbl;
+	struct mt7921_asar_geo_limit_v2 tbl[0];
+} __packed;
+
+struct mt7921_asar_cl {
+	u8 names[4];
+	u8 version;
+	u8 mode_6g;
+	u8 cl6g[6];
+} __packed;
+
+struct mt7921_acpi_sar {
+	u8 ver;
+	union {
+		struct mt7921_asar_dyn *dyn;
+		struct mt7921_asar_dyn_v2 *dyn_v2;
+	};
+	union {
+		struct mt7921_asar_geo *geo;
+		struct mt7921_asar_geo_v2 *geo_v2;
+	};
+	struct mt7921_asar_cl *countrylist;
+};
+
+#endif
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 8ff1a0f2f076c..68f68465f8806 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
@@ -289,6 +289,8 @@  int mt7921_register_device(struct mt7921_dev *dev)
 	if (!mt76_is_mmio(&dev->mt76))
 		hw->extra_tx_headroom += MT_SDIO_TXD_SIZE + MT_SDIO_HDR_SIZE;
 
+	mt7921_init_acpi_sar(dev);
+
 	ret = mt7921_init_wcid(dev);
 	if (ret)
 		return ret;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index cebc3cfa01b8a..4d2558ca5f1aa 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
@@ -8,6 +8,7 @@ 
 #include <linux/ktime.h>
 #include "../mt76_connac_mcu.h"
 #include "regs.h"
+#include "acpi_sar.h"
 
 #define MT7921_MAX_INTERFACES		4
 #define MT7921_WTBL_SIZE		20
@@ -170,6 +171,9 @@  struct mt7921_phy {
 
 	struct sk_buff_head scan_event_list;
 	struct delayed_work scan_work;
+#ifdef CONFIG_ACPI
+	struct mt7921_acpi_sar *acpisar;
+#endif
 };
 
 #define mt7921_init_reset(dev)		((dev)->hif_ops->init_reset(dev))
@@ -468,4 +472,20 @@  int mt7921_mcu_uni_add_beacon_offload(struct mt7921_dev *dev,
 				      struct ieee80211_hw *hw,
 				      struct ieee80211_vif *vif,
 				      bool enable);
+#ifdef CONFIG_ACPI
+int mt7921_init_acpi_sar(struct mt7921_dev *dev);
+int mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default);
+#else
+static inline int
+mt7921_init_acpi_sar(struct mt7921_dev *dev)
+{
+	return 0;
+}
+
+static inline int
+mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default)
+{
+	return 0;
+}
+#endif
 #endif