diff options
| author | Sean Wang <sean.wang@mediatek.com> | 2026-02-18 18:40:02 -0600 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2026-03-24 15:49:29 +0000 |
| commit | 14a7ba034fcd9d1766503ef44cc491c6fda8db2c (patch) | |
| tree | e5617e6823a28b611245d9bc9ccab1a4304cd18d | |
| parent | 0a7d2fca06afb036ff2d61540fc68e6e48eb9fbe (diff) | |
wifi: mt76: mt792x: add PSE handling barrier for the large MCU cmd
Add a dummy register read in mt76_connac_mcu_rate_txpower_band() to act as
a PSE barrier. This would release PSE pages and prevents buffer underflow
issues when handling MCU commands with larger payloads without the response
in mt76_connac_mcu_set_rate_txpower().
This is a prerequisite patch before enabling MT7902 PCIe and SDIO support.
Co-developed-by: Xiong Huang <xiong.huang@mediatek.com>
Signed-off-by: Xiong Huang <xiong.huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260219004007.19733-6-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c | 4 | ||||
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt792x_regs.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c index d7fbf3454bb8..89bd52ea8bf7 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c @@ -4,6 +4,7 @@ #include <linux/firmware.h> #include "mt76_connac2_mac.h" #include "mt76_connac_mcu.h" +#include "mt792x_regs.h" int mt76_connac_mcu_start_firmware(struct mt76_dev *dev, u32 addr, u32 option) { @@ -2246,6 +2247,9 @@ mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy, false); if (err < 0) goto out; + + /* read a CR to avoid PSE buffer underflow */ + mt76_connac_mcu_reg_rr(dev, MT_PSE_BASE); } out: diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_regs.h b/drivers/net/wireless/mediatek/mt76/mt792x_regs.h index acf627aed609..7ddde9286861 100644 --- a/drivers/net/wireless/mediatek/mt76/mt792x_regs.h +++ b/drivers/net/wireless/mediatek/mt76/mt792x_regs.h @@ -25,6 +25,8 @@ #define MT_PLE_AC_QEMPTY(_n) MT_PLE(0x500 + 0x40 * (_n)) #define MT_PLE_AMSDU_PACK_MSDU_CNT(n) MT_PLE(0x10e0 + ((n) << 2)) +#define MT_PSE_BASE 0x820c8000 + /* TMAC: band 0(0x21000), band 1(0xa1000) */ #define MT_WF_TMAC_BASE(_band) ((_band) ? 0x820f4000 : 0x820e4000) #define MT_WF_TMAC(_band, ofs) (MT_WF_TMAC_BASE(_band) + (ofs)) |