From: Deren Wu <deren.wu@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Co-developed-by: Quan Zhou <quan.zhou@xxxxxxxxxxxx>
Signed-off-by: Quan Zhou <quan.zhou@xxxxxxxxxxxx>
Co-developed-by: Ming Yen Hsieh <mingyen.hsieh@xxxxxxxxxxxx>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@xxxxxxxxxxxx>
Signed-off-by: Deren Wu <deren.wu@xxxxxxxxxxxx>
---
.../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 --git a/drivers/net/wireless/mediatek/mt76/mt7921/Makefile b/drivers/net/wireless/mediatek/mt76/mt7921/Makefile
index 0a146818c623..e5d2d2e131a2 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 000000000000..fb3d31b96682
--- /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, 0) < 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 000000000000..23f86bfae0c0
--- /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 4a8675634f80..0c4e973d002e 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 5ca584bb2fc6..8b26bece28ae 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_MAX_WMM_SETS 4
@@ -171,6 +172,9 @@ 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))
@@ -481,4 +485,20 @@ 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
--
2.18.0
