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wifi: mt76: mt792x: add PSE handling barrier for the large MCU cmd

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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>
This commit is contained in:
Sean Wang 2026-02-18 18:40:02 -06:00 committed by Felix Fietkau
parent 0a7d2fca06
commit 14a7ba034f
2 changed files with 6 additions and 0 deletions
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4
drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
View File

@ -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:

2
drivers/net/wireless/mediatek/mt76/mt792x_regs.h
View File

@ -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))