From: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
Due to a limitation in available memory, the MT7916 firmware can only
handle either 5 GHz or 6 GHz at a time. It does not support runtime
switching without a full restart.
On older firmware, this accidentally worked to some degree due to missing
checks, but couldn't be supported properly, because it left the 6 GHz
channels uncalibrated.
Newer firmware refuses to start on either band if the passed EEPROM
data indicates support for both.
Deal with this limitation by using a module parameter to specify the
preferred band in case both are supported.
Fixes: b4d093e321bd ("mt76: mt7915: add 6 GHz support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Shayne Chen <shayne.chen@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
---
.../wireless/mediatek/mt76/mt7915/eeprom.c | 21 +++++++++++++++++--
.../net/wireless/mediatek/mt76/mt7915/init.c | 4 ++--
2 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
index bfdbc15abaa9..928e0b07a9bf 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
@@ -2,9 +2,14 @@
/* Copyright (C) 2020 MediaTek Inc. */
#include <linux/firmware.h>
+#include <linux/moduleparam.h>
#include "mt7915.h"
#include "eeprom.h"
+static bool enable_6ghz;
+module_param(enable_6ghz, bool, 0644);
+MODULE_PARM_DESC(enable_6ghz, "Enable 6 GHz instead of 5 GHz on hardware that supports both");
+
static int mt7915_eeprom_load_precal(struct mt7915_dev *dev)
{
struct mt76_dev *mdev = &dev->mt76;
@@ -170,8 +175,20 @@ static void mt7915_eeprom_parse_band_config(struct mt7915_phy *phy)
phy->mt76->cap.has_6ghz = true;
return;
case MT_EE_V2_BAND_SEL_5GHZ_6GHZ:
- phy->mt76->cap.has_5ghz = true;
- phy->mt76->cap.has_6ghz = true;
+ if (enable_6ghz) {
+ phy->mt76->cap.has_6ghz = true;
+ u8p_replace_bits(&eeprom[MT_EE_WIFI_CONF + band],
+ MT_EE_V2_BAND_SEL_6GHZ,
+ MT_EE_WIFI_CONF0_BAND_SEL);
+ } else {
+ phy->mt76->cap.has_5ghz = true;
+ u8p_replace_bits(&eeprom[MT_EE_WIFI_CONF + band],
+ MT_EE_V2_BAND_SEL_5GHZ,
+ MT_EE_WIFI_CONF0_BAND_SEL);
+ }
+ /* force to buffer mode */
+ dev->flash_mode = true;
+
return;
default:
phy->mt76->cap.has_2ghz = true;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index 6bef96e3d2a3..f82216d1bda0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -1239,14 +1239,14 @@ int mt7915_register_device(struct mt7915_dev *dev)
if (ret)
goto unreg_dev;
- ieee80211_queue_work(mt76_hw(dev), &dev->init_work);
-
if (phy2) {
ret = mt7915_register_ext_phy(dev, phy2);
if (ret)
goto unreg_thermal;
}
+ ieee80211_queue_work(mt76_hw(dev), &dev->init_work);
+
dev->recovery.hw_init_done = true;
ret = mt7915_init_debugfs(&dev->phy);
--
2.46.0
