The register REG_SYS_CFG1 is used to determine chip basic information as arguments of following flows, such as download firmware and load PHY parameters, so driver read the value early (before power-on). However, the direct IO is disallowed before power-on, or it causes wrong values, which driver recognizes a chip as a wrong type RF_1T1R, but actually RF_2T2R, causing driver warns: rtw88_8822cs mmc1:0001:1: unsupported rf path (1) Fix it by using indirect IO before power-on. Reported-by: Piotr Oniszczuk <piotr.oniszczuk@xxxxxxxxx> Closes: https://lore.kernel.org/linux-wireless/699C22B4-A3E3-4206-97D0-22AB3348EBF6@xxxxxxxxx/T/#t Suggested-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> Signed-off-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx> --- drivers/net/wireless/realtek/rtw88/sdio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c index cc2d4fef3587..99d7c629eac6 100644 --- a/drivers/net/wireless/realtek/rtw88/sdio.c +++ b/drivers/net/wireless/realtek/rtw88/sdio.c @@ -144,6 +144,10 @@ static u32 rtw_sdio_to_io_address(struct rtw_dev *rtwdev, u32 addr, static bool rtw_sdio_use_direct_io(struct rtw_dev *rtwdev, u32 addr) { + if (!test_bit(RTW_FLAG_POWERON, rtwdev->flags) && + !rtw_sdio_is_bus_addr(addr)) + return false; + return !rtw_sdio_is_sdio30_supported(rtwdev) || rtw_sdio_is_bus_addr(addr); } -- 2.25.1
