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wifi: mt76: mt792x: drain USB UDMA before WFSYS reset

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Stop USB UDMA RX/TX and wait for idle before WFSYS reset.
Warn if the engine remains busy.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260613224131.2396026-5-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Sean Wang 2026-06-13 17:41:29 -05:00 committed by Felix Fietkau
parent e137e5fd24
commit a4803d1801
1 changed files with 20 additions and 0 deletions
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20
drivers/net/wireless/mediatek/mt76/mt792x_usb.c
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@ -11,6 +11,8 @@
#include "mt792x.h"
#include "mt76_connac2_mac.h"
#define MT792X_USB_UDMA_IDLE_TIMEOUT 1000
static int mt792xu_read32(struct mt76_dev *dev, u32 addr, void *buf)
{
return __mt76u_vendor_request(dev, MT_VEND_READ_EXT,
@ -343,6 +345,23 @@ static void mt792xu_epctl_rst_opt(struct mt792x_dev *dev, bool reset)
mt792xu_uhw_wr(&dev->mt76, MT_SSUSB_EPCTL_CSR_EP_RST_OPT, val);
}
static void mt792xu_wait_udma_idle(struct mt792x_dev *dev)
{
u32 mask = MT_WL_RX_BUSY | MT_WL_TX_BUSY;
u32 val;
mt76_set(dev, MT_UDMA_WLCFG_0, MT_WL_RX_FLUSH);
if (mt76_poll_msec(dev, MT_UDMA_WLCFG_0, mask, 0,
MT792X_USB_UDMA_IDLE_TIMEOUT))
return;
val = mt76_rr(dev, MT_UDMA_WLCFG_0);
dev_warn(dev->mt76.dev,
"UDMA busy before WFSYS reset: WLCFG0=0x%08x\n", val);
}
struct mt792xu_wfsys_desc {
u32 rst_reg;
u32 done_reg;
@ -409,6 +428,7 @@ int mt792xu_wfsys_reset(struct mt792x_dev *dev)
if (atomic_read(&dev->mt76.bus_hung))
return -EIO;
mt792xu_wait_udma_idle(dev);
mt792xu_epctl_rst_opt(dev, false);
val = mt792xu_uhw_rr(&dev->mt76, desc->rst_reg);