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patch: rtw88: sdio: fix incorrect RF path detection when MAC is powered off (#8587)

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SuperKali
2025-09-08 07:33:30 +02:00
committed by GitHub
parent 343c287bb8
commit 343bcc6e24
2 changed files with 49 additions and 0 deletions
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48
patch/misc/rtw88/6.1/002-rtw88-sdio-rf-path-detection-fix.patch Normal file
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@@ -0,0 +1,48 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: SuperKali <hello@superkali.me>
Date: Sun, 7 Sep 2025 22:00:20 +0200
Subject: rtw88: sdio: fix incorrect RF path detection when MAC is powered off
When reading REG_SYS_CFG1 register via direct I/O while MAC is powered off,
incorrect values are returned (0x303030ea instead of 0x493d30ea), causing
RTL8822CS to be incorrectly detected as 1T1R instead of 2T2R.
This leads to "unsupported rf path" errors and WiFi malfunction in 9 out of
10 boots on some hardware configurations.
Fix by forcing indirect I/O when MAC is powered off and the address is not
a bus address, ensuring correct register values are read during chip
initialization.
Signed-off-by: SuperKali <hello@superkali.me>
Link: https://lore.kernel.org/linux-wireless/7407FAA3-F4A4-48AA-91E5-A78DA711447D@gmail.com/
---
drivers/net/wireless/realtek/rtw88/sdio.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
index 0cae5746f540..b054a73b50e0 100644
--- a/drivers/net/wireless/realtek/rtw88/sdio.c
+++ b/drivers/net/wireless/realtek/rtw88/sdio.c
@@ -141,12 +141,16 @@ static u32 rtw_sdio_to_io_address(struct rtw_dev *rtwdev, u32 addr,
return rtw_sdio_to_bus_offset(rtwdev, addr);
}
static bool rtw_sdio_use_direct_io(struct rtw_dev *rtwdev, u32 addr)
{
- return !rtw_sdio_is_sdio30_supported(rtwdev) ||
- rtw_sdio_is_bus_addr(addr);
+ if (!rtw_sdio_is_bus_addr(addr) &&
+ !test_bit(RTW_FLAG_POWERON, rtwdev->flags))
+ return false;
+
+ return !rtw_sdio_is_sdio30_supported(rtwdev) ||
+ rtw_sdio_is_bus_addr(addr);
}
static int rtw_sdio_indirect_reg_cfg(struct rtw_dev *rtwdev, u32 addr, u32 cfg)
{
struct rtw_sdio *rtwsdio = (struct rtw_sdio *)rtwdev->priv;
--
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