The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 57af267d2b8f5d88485c6372761386d79c5e6a1a # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025021037-retype-jaunt-6b0b@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 57af267d2b8f5d88485c6372761386d79c5e6a1a Mon Sep 17 00:00:00 2001 From: Shayne Chen shayne.chen@mediatek.com Date: Thu, 10 Oct 2024 10:38:16 +0200 Subject: [PATCH] wifi: mt76: mt7915: add module param to select 5 GHz or 6 GHz on MT7916

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@vger.kernel.org Signed-off-by: Shayne Chen shayne.chen@mediatek.com Link: https://patch.msgid.link/20241010083816.51880-1-nbd@nbd.name Signed-off-by: Felix Fietkau nbd@nbd.name

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);